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Smokeless Powder is the American term for the propellent powder used in modern ammunition cartridges. Generally, modern powder is in most cases based on nitrocellulose, but can be made with a variety of substances. Smokeless Powder must not be confused with gunpowder or “black powder” which is the historical propellant used in firearms, cannon, etc. until the late 19th century. Modern smokeless powder is not interchangeable with gunpowder/“black powder”.

Storage

Smokeless Powder is a flammable substance that must properly stored. It should be kept in a secure area, away from children, open flames, smokers, etc. however it should not be locked up in an airtight or near-airtight container such as a gun safe. In the event of a fire, powder kept in an tight container could be come a pressure-explosive hazard.

Propellant should always be kept in its original factory packaging. The original packaging, aside from the standard information about the type of powder, will contain manufacturing lot information that may be necessary to consult in the event of a powder recall.

Consult your local building codes for any maximum amount of powder that is permitted to be kept in your home as some codes to place restrictions on storage in a residential building.

Common Manufacturers

Some common manufacturers of propellent are:

Most manufacturers provide load data for their powders given a select type of bullet. Always consult multiple reloading reloading manuals when developing a new load.

See Also

Smokeless Powder
Buying Gunpowder
Stocking Gunpowder

“50 lbs of gunpowder will make 7500 rounds of .308, 15000 rounds of .223 or 80000 rounds of .45 depending on how you load. So keeping your larger cartridges as your stockpile of loaded ammunition gives you a lot more mileage. For example, keeping 10,000 rounds of .50 BMG loaded with a powder that could be used in .308 and .223 would be ideal, this way it can either be ammo, or just a storage container. JWR Adds: Pay close attention to powder burning rates and reloading pressure curves. Powder that is suitable for large volume cases is not always appropriate for large cartridges. Follow published loading data scrupulously! Only primers must be stockpiled, which are small, lightweight, and can be spread out and hidden in many areas easily. Limits are not imposed on reloading components such as brass cases or projectiles, so these can always be stored without a hassle.”

Fair Use Disclaimer Source:

http://www.survivalblog.com/2006/09/stockpile_fire_safety_consider.html


see AR-15 and Build Your Own AR-15

Specific References
General References

Based on research from diverse Fair Use Disclaimer Sources:

Snippet from Wikipedia: Smokeless powder

Smokeless powder is the name given to a number of propellants used in firearms and artillery that produce negligible smoke when fired, unlike the historical black powder they replaced. The term is unique to the United States and is generally not used in other English-speaking countries, which initially used proprietary names such as "Ballistite" and "Cordite" but gradually shifted to "propellant" as the generic term.

The basis of the term smokeless is that the combustion products are mainly gaseous, compared to around 55% solid products (mostly potassium carbonate, potassium sulfate, and potassium sulfide) for black powder. Despite its name, smokeless powder is not completely free of smoke; while there may be little noticeable smoke from small-arms ammunition, smoke from artillery fire can be substantial. This article focuses on nitrocellulose formulations, but the term smokeless powder was also used to describe various picrate mixtures with nitrate, chlorate, or dichromate oxidizers during the late 19th century, before the advantages of nitrocellulose became evident.

Since the 14th century gunpowder was not actually a physical "powder", and smokeless powder can be produced only as a pelletized or extruded granular material. Smokeless powder allowed the development of modern semi- and fully automatic firearms and lighter breeches and barrels for artillery. Burnt gunpowder leaves a thick, heavy fouling that is hygroscopic and causes rusting of the barrel. The fouling left by smokeless powder exhibits none of these properties (though some primer compounds can leave hygroscopic salts that have a similar effect; non-corrosive primer compounds were introduced in the 1920s). This makes an autoloading firearm with many moving parts feasible (which would otherwise jam or seize under heavy black powder fouling).

Smokeless powders are classified as, typically, division 1.3 explosives under the UN Recommendations on the transportation of Dangerous goods – Model Regulations, regional regulations (such as ADR) and national regulations. However, they are used as solid propellants; in normal use, they undergo deflagration rather than detonation.

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Smokeless powder is the name given to a number of propellants used in firearms and artillery which produce negligible smoke when fired, unlike black powder which they replaced. The term is unique to the United States and is generally not used in other English speaking countries, which initially used proprietary names such as “Ballistite” and “Cordite” but gradually shifted to “propellant” as the generic term.

The basis of the term smokeless is that the combustion products are mainly gaseous, compared to around 55% solid products (mostly potassium carbonate, potassium sulfate, and potassium sulfide) for black powder.<ref name=“NRA1”>Hatcher, Julian S. and Barr, Al Handloading Hennage Lithograph Company (1951) p.34</ref> Despite its name, smokeless powder is not completely smoke-free;<ref name=“Naval44”>Fairfield, A. P., CDR USN Naval Ordnance Lord Baltimore Press (1921) p.44</ref> while there may be little noticeable smoke from small-arms ammunition, smoke from artillery fire can be substantial. This article focuses on nitrocellulose formulations, but the term smokeless powder was also used to describe various picrate mixtures with nitrate, chlorate, or dichromate oxidizers during the late 19th century, before the advantages of nitrocellulose became evident.<ref name=“sharpe146”>Sharpe, Philip B. Complete Guide to Handloading 3rd Edition (1953) Funk & Wagnalls pp.146-149</ref>

Since the 14th century<ref>seegunpowder</ref> gunpowder was not actually a physical “powder,” and smokeless powder can only be produced as a pelletized or extruded granular material. Smokeless powder allowed the development of modern semi- and fully automatic firearms and lighter breeches and barrels for artillery. Burnt black powder leaves a thick, heavy fouling which is hygroscopic and causes rusting of the barrel. The fouling left by smokeless powder exhibits none of these properties. This makes an autoloading firearm with many moving parts feasible (which would otherwise jam or seize under heavy black powder fouling).

Smokeless powders are classified as, typically, division 1.3 explosives under the UN Recommendations on the transportation of Dangerous goods – Model Regulations, regional regulations (such as ADR) and national regulations (such the United States' ATF). However, they are used as solid propellants; in normal use, they undergo deflagration rather than detonation.

Background

Military commanders had been complaining since the Napoleonic Wars about the problems of giving orders on a battlefield obscured by the smoke of firing. Verbal commands could not be heard above the noise of the guns, and visual signals could not be seen through the thick smoke from the gunpowder used by the guns. Unless there was a strong wind, after a few shots, soldiers using black powder ammunition would have their view obscured by a huge cloud of smoke. Snipers or other concealed shooters were given away by a cloud of smoke over the firing position. Black powder is also corrosive, making cleaning mandatory after every use. Likewise, black powder's tendency to produce severe fouling caused actions to jam and often made reloading difficult.

Nitroglycerine and guncotton

Nitroglycerine was synthesized by the Italian chemist Ascanio Sobrero in 1847.<ref>Davis, Tenney L. The Chemistry of Powder & Explosives (1943) page 195</ref> It was subsequently developed and manufactured by Alfred Nobel as an explosive substance, but it was unsuitable as a propellant. A major step forward was the discovery of guncotton, a nitrocellulose-based material, by Swiss chemist Christian Friedrich Schönbein in 1846. He promoted its use as a blasting explosive<ref name=“Handloading28”>Davis, William C., Jr. Handloading National Rifle Association of America (1981) p.28</ref> and sold manufacturing rights to the Austrian Empire. Guncotton was more powerful than gunpowder, but at the same time was somewhat more unstable. John Taylor obtained an English patent for guncotton; and John Hall & Sons began manufacture in Faversham. English interest languished after an explosion destroyed the Faversham factory in 1847. Austrian Baron von Lenk built two guncotton plants producing artillery propellent, but it was dangerous under field conditions, and guns that could fire thousands of rounds using gunpowder would reach their service life after only a few hundred shots with the more powerful guncotton. Small arms could not withstand the pressures generated by guncotton. After one of the Austrian factories blew up in 1862, Thomas Prentice & Company began manufacturing guncotton in Stowmarket in 1863; and British War Office chemist Sir Frederick Abel began thorough research at Waltham Abbey Royal Gunpowder Mills leading to a manufacturing process that eliminated the impurities in nitrocellulose making it safer to produce and a stable product safer to handle. Abel patented this process in 1865, when the second Austrian guncotton factory exploded. After the Stowmarket factory exploded in 1871, Waltham Abbey began production of guncotton for torpedo and mine warheads.<ref name=“sharpe141”>Sharpe, Philip B. Complete Guide to Handloading 3rd Edition (1953) Funk & Wagnalls pp.141-144</ref>

Propellant improvements

In 1863, Prussian artillery captain Johann F. E. Schultze patented a small arms propellent of nitrated hardwood impregnated with saltpetre or barium nitrate. Prentice received an 1866 patent for a sporting powder of nitrated paper manufactured at Stowmarket, but ballistic uniformity suffered as the paper absorbed atmospheric moisture. In 1871, Frederick Volkmann received an Austrian patent for a colloided version of Schultze powder called Collodin which he manufactured near Vienna for use in sporting firearms. Austrian patents were not published at the time, and the Austrian Empire considered the operation a violation of the government monopoly on explosives manufacture and closed the Volkmann factory in 1875.<ref name=“sharpe141”/> In 1882, the Explosives Company at Stowmarket patented an improved formulation of nitrated cotton gelatinised by ether-alcohol with nitrates of potassium and barium. These propellants were suitable for shotguns but not rifles.<ref name=“Artillery138”>Hogg, Oliver F. G. Artillery: Its Origin, Heyday and Decline (1969) p.138-139</ref>

In 1884, Paul Vieille invented a smokeless powder called Poudre B (short for poudre blanche – white powder, as distinguished from black powder)<ref name=“Chemistry289”>Davis, Tenney L. The Chemistry of Powder & Explosives (1943) pages 289–292</ref> made from 68.2% insoluble nitrocellulose, 29.8% soluble nitrocellusose gelatinized with ether and 2% paraffin. This was adopted for the Lebel rifle.<ref name=“Artillery139”>Hogg, Oliver F. G. Artillery: Its Origin, Heyday and Decline (1969) p.139</ref> It was passed through rollers to form paper thin sheets, which were cut into flakes of the desired size.<ref name=“Chemistry289”/> The resulting propellant, today known as pyrocellulose, contains somewhat less nitrogen than guncotton and is less volatile. A particularly good feature of the propellant is that it will not detonate unless it is compressed, making it very safe to handle under normal conditions.

Vieille's powder revolutionized the effectiveness of small guns, because it gave off almost no smoke and was three times more powerful than black powder. Higher muzzle velocity meant a flatter trajectory and less wind drift and bullet drop, making 1000 meter shots practicable. Since less powder was needed to propel a bullet, the cartridge could be made smaller and lighter. This allowed troops to carry more ammunition for the same weight. Also, it would burn even when wet. Black powder ammunition had to be kept dry and was almost always stored and transported in watertight cartridges.

Other European countries swiftly followed and started using their own versions of Poudre B, the first being Germany and Austria which introduced new weapons in 1888. Subsequently Poudre B was modified several times with various compounds being added and removed. Krupp began adding diphenylamine as a stabilizer in 1888.<ref name=“sharpe141”/>

Meanwhile, in 1887, Alfred Nobel obtained an English patent for a smokeless gunpowder he called Ballistite. In this propellant the fibrous structure of cotton (nitro-cellulose) was destroyed by a nitro-glycerine solution instead of a solvent.<ref name=“Artillery140b”>Hogg, Oliver F. G. Artillery: Its Origin, Heyday and Decline (1969) p.140</ref> In England in 1889, a similar powder was patented by Hiram Maxim, and in the USA in 1890 by Hudson Maxim.<ref>

Manufacture of explosive – H. S. Maxim</ref> Ballistite was patented in the United States in 1891.

The Germans adopted ballistite for naval use in 1898, calling it WPC/98. The Italians adopted it as filite, in cord instead of flake form, but realising its drawbacks changed to a formulation with nitroglycerine they called solenite. In 1891 the Russians tasked the chemist Mendeleef with finding a suitable propellant, he created nitrocellulose gelatinised by ether-alcohol, which produced more nitrogen and more uniform colloidal structure than the French use of nitro-cottons in Poudre B. He called it pyro-collodion.<ref name=“Artillery140b”/>

Britain conducted trials on all the various types of propellant brought to their attention, but were dissatisfied with them all and sought something superior to all existing types. In 1889, Sir Frederick Abel, James Dewar and Dr W Kellner patented (Nos 5614 and 11,664 in the names of Abel and Dewar) a new formulation that was manufactured at the Royal Gunpowder Factory at Waltham Abbey. It entered British service in 1891 as Cordite Mark 1. Its main composition was 58% Nitro-glycerine, 37% Guncotton and 3% mineral jelly. A modified version, Cordite MD, entered service in 1901, this increased guncotton to 65% and reduced nitro-glycerine to 30%, this change reduced the combustion temperature and hence erosion and barrel wear. Cordite's advantages over gunpowder were reduced maximum pressure in the chamber (hence lighter breeches, etc.) but longer high pressure. Cordite could be made in any desired shape or size.<ref name=“Artillery141”>Hogg, Oliver F. G. Artillery: Its Origin, Heyday and Decline (1969) p.141</ref> The creation of cordite led to a lengthy court battle between Nobel, Maxim, and another inventor over alleged British patent infringement.

The Anglo-American Explosives Company began manufacturing its shotgun powder in Oakland, New Jersey in 1890. DuPont began producing guncotton at Carneys Point Township, New Jersey in 1891.<ref name=“sharpe146”/> Charles E. Munroe of the Naval Torpedo Station in Newport, Rhode Island patented a formulation of guncotton colloided with nitrobenzene, called Indurite, in 1891.<ref name=“chemistry 296”>Davis, Tenney L. The Chemistry of Powder & Explosives (1943) pages 296-297</ref> Several United States firms began producing smokeless powder when Winchester Repeating Arms Company started loading sporting cartridges with Explosives Company powder in 1893. California Powder Works began producing a mixture of nitroglycerine and nitrocellulose with ammonium picrate as Peyton Powder, Leonard Smokeless Powder Company began producing nitroglycerine-nitrocellulose Ruby powders, Laflin & Rand negotiated a license to produce Ballistite, and DuPont started producing smokeless shotgun powder. The United States Army evaluated 25 varieties of smokeless powder and selected Ruby and Peyton Powders as the most suitable for use in the Krag-Jørgensen service rifle. Ruby was preferred, because tin-plating was required to protect brass cartridge cases from picric acid in the Peyton Powder. Rather than paying the required royalties for Ballistite, Laflin & Rand financed Leonard's reorganization as the American Smokeless Powder Company. United States Army Lieutenant Whistler assisted American Smokeless Powder Company factory superintendent Aspinwall in formulating an improved powder named W.A. for their efforts. W.A. smokeless powder was the standard for United States military service rifles from 1897 until 1908.<ref name=“sharpe146”/>

In 1897, United States Navy Lieutenant John Bernadou patented a nitrocellulose powder colloided with ether-alcohol.<ref name=“chemistry 296”/> The Navy licensed or sold patents for this formulation to DuPont and the California Powder Works while retaining manufacturing rights for the Naval Powder Factory, Indian Head, Maryland constructed in 1900. The United States Army adopted the Navy single-base formulation in 1908 and began manufacture at Picatinny Arsenal.<ref name=“sharpe146”/> By that time Laflin & Rand had taken over the American Powder Company to protect their investment, and Laflin & Rand had been purchased by DuPont in 1902.<ref>

</ref> Upon securing a 99-year lease of the Explosives Company in 1903, DuPont enjoyed use of all significant smokeless powder patents in the United States, and was able to optimize production of smokeless powder.<ref name=“sharpe146”/> When government anti-trust action forced divestiture in 1912, DuPont retained the nitrocellulose smokeless powder formulations used by the United States military and released the double-base formulations used in sporting ammunition to the reorganized Hercules Powder Company. These newer propellants were more stable and thus safer to handle than Poudre B, and also more powerful.

Chemical formulations

Currently, propellants using nitrocellulose (detonation velocity 7,300 m/s) (typically an ether-alcohol colloid of nitrocellulose) as the sole explosive propellant ingredient are described as single-base powder.<ref name=“Chemistry297”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) p.297</ref>

Propellants mixtures containing nitrocellulose and nitroglycerin (detonation velocity 7,700 m/s) as explosive propellant ingredients are known as double-base powder.<ref name=“Chemistry298”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) p.298</ref>

During the 1930s triple-base propellant containing nitrocellulose, nitroglycerin, and a substantial quantity of nitroguanidine (detonation velocity 8,200 m/s) as explosive propellant ingredients was developed. These propellant mixtures have reduced flash and flame temperature without sacrificing chamber pressure compared to single and double base propellants, albeit at the cost of more smoke.<br> In practice, triple base propellants are reserved mainly for large caliber ammunition such as used in (naval) artillery and tank guns. During World War II it had some use by British artillery. After that war it became the standard propellant in all British large caliber ammunition designs except small-arms. Most western nations, except the United States, followed a similar path.

In the late 20th century new propellant formulations started to appear. These are based on nitroguanidine and high explosives of the RDX (detonation velocity 8,750 m/s) type.

Instability and stabilization

Nitrocellulose deteriorates with time, yielding acidic byproducts. Those byproducts catalyze the further deterioration, increasing its rate. The released heat, in case of bulk storage of the powder, or too large blocks of solid propellant, can cause self-ignition of the material. Single-base nitrocellulose propellants are hygroscopic and most susceptible to degradation; double-base and triple-base propellants tend to deteriorate more slowly. To neutralize the decomposition products, which could otherwise cause corrosion of metals of the cartridges and gun barrels, calcium carbonate is added to some formulations.

To prevent buildup of the deterioration products, stabilizers are added. Diphenylamine is one of the most common stabilizers used. Nitrated analogs of diphenylamine formed in the process of stabilizing decomposing powder are sometimes used as stabilizers themselves.<ref name=“Naval28”>Fairfield, A. P., CDR USN Naval Ordnance Lord Baltimore Press (1921) p.28</ref><ref name=“Chemistry310”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) p. 310</ref> The stabilizers are added in the amount of 0.5–2% of the total amount of the formulation; higher amounts tend to degrade its ballistic properties. The amount of the stabilizer is depleted with time. Propellants in storage should be periodically tested for the amount of stabilizer remaining, as its depletion may lead to auto-ignition of the propellant.

Physical variations

powders]] Smokeless powder may be corned into small spherical balls or extruded into cylinders or strips with many cross-sectional shapes (strips with various rectangular proportions, single or multi-hole cylinders, slotted cylinders) using solvents such as ether. These extrusions can be cut into short ('flakes') or long pieces ('cords' many inches long). Cannon powder has the largest pieces.

The properties of the propellant are greatly influenced by the size and shape of its pieces. The specific surface area of the propellant influences the speed of burning, and the size and shape of the particles determine the specific surface area. By manipulation of the shape it is possible to influence the burning rate and hence the rate at which pressure builds during combustion. Smokeless powder burns only on the surfaces of the pieces. Larger pieces burn more slowly, and the burn rate is further controlled by flame-deterrent coatings which retard burning slightly. The intent is to regulate the burn rate so that a more or less constant pressure is exerted on the propelled projectile as long as it is in the barrel so as to obtain the highest velocity. The perforations stabilize the burn rate because as the outside burns inward (thus shrinking the burning surface area) the inside is burning outward (thus increasing the burning surface area, but faster, so as to fill up the increasing volume of barrel presented by the departing projectile).<ref name=“Naval41”>Fairfield, A. P., CDR USN Naval Ordnance Lord Baltimore Press (1921) pp.41–43</ref> Fast-burning pistol powders are made by extruding shapes with more area such as flakes or by flattening the spherical granules. Drying is usually performed under a vacuum. The solvents are condensed and recycled. The granules are also coated with graphite to prevent static electricity sparks from causing undesired ignitions.<ref name=“Chemistry306”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) p.306</ref>

Faster-burning propellants generate higher temperatures and higher pressures, however they also increase wear on gun barrels.

Smokeless propellant components

The propellant formulations may contain various energetic and auxiliary components:

  • Propellants:
    • Nitrocellulose, an energetic component of most smokeless propellants<ref name=“Campbell5”>Campbell, John Naval Weapons of World War Two (1985) p. 5</ref>
    • Nitroglycerin, an energetic component of double-base and triple-base formulations<ref name=“Campbell5”/>
    • Nitroguanidine, a component of triple-base formulations<ref name=“Campbell5”/>
    • D1NA (bis-nitroxyethylnitramine)<ref name=“Campbell104”>Campbell, John Naval Weapons of World War Two (1985) p. 104</ref>
    • Fivonite (tetramethylolcyclopentanone)<ref name=“Campbell104”/>
    • DGN (di-ethylene glycol dinitrate)<ref name=“Campbell221”>Campbell, John Naval Weapons of World War Two (1985) p. 221</ref>
    • Acetyl cellulose<ref name=“Campbell318”>Campbell, John Naval Weapons of World War Two (1985) p. 318</ref>
  • Deterrents, (or moderants), to slow the burning rate
    • Centralites (symmetrical diphenyl urea—primarily diethyl or dimethyl)<ref name=“Chemistry”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) pages 317–320</ref><ref name=“Handloading30”>Davis, William C., Jr. Handloading National Rifle Association of America (1981) p.30</ref>
    • Dibutyl phthalate<ref name=“Campbell5”/><ref name=“Handloading30”/>
    • Dinitrotoluene (toxic, carcinogenic, and obsolete)<ref name=“Campbell5”/><ref name=“Handloading31”>Davis, William C., Jr. Handloading National Rifle Association of America (1981) p.31</ref>
    • Akardite (asymmetrical diphenyl urea)<ref name=“Campbell221”/>
    • ortho-tolyl urethane<ref name=“Campbell174”>Campbell, John Naval Weapons of World War Two (1985) p. 174</ref>
    • Polyester adipate
    • Camphor (obsolete)<ref name=“Handloading30”/>
  • Stabilizers, to prevent or slow down self-decomposition<ref name=“Chemistry309”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) pages 307–311</ref>
    • Diphenylamine<ref name=“Chemistry302”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) p. 302</ref>
    • Petroleum jelly<ref name=“Chemistry296”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) p. 296</ref>
    • Calcium carbonate<ref name=“Campbell5”/>
    • Magnesium oxide<ref name=“Campbell221”/>
    • Sodium bicarbonate<ref name=“Campbell318”/>
    • beta-naphthol methyl ether<ref name=“Campbell174”/>
    • Amyl alcohol (obsolete)<ref name=“Chemistry307”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) p. 307</ref>
    • Aniline (obsolete)<ref name=“Chemistry308”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) p. 308</ref>
  • Decoppering additives, to hinder the buildup of copper residues from the gun barrel rifling
    • Tin metal and compounds (e.g., tin dioxide)<ref name=“Campbell5”/><ref name=“Handloading32”>Davis, William C., Jr. Handloading National Rifle Association of America (1981) p.32</ref>
    • Bismuth metal and compounds (e.g., bismuth trioxide, bismuth subcarbonate, bismuth nitrate, bismuth antimonide); the bismuth compounds are favored as copper dissolves in molten bismuth, forming brittle and easily removable alloy
    • Lead foil and lead compounds, phased out due to toxicity<ref name=“Campbell104”/>
  • Flash reducers, to reduce the brightness of the muzzle flash (all have a disadvantage: the production of smoke)<ref name=“Chemistry322”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) pages 322–327</ref>
    • Potassium chloride<ref name=“Chemistry323”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) pages 323–327</ref>
    • Potassium sulfate<ref name=“Campbell5”/><ref name=“Handloading32”/>
    • Potassium hydrogen tartarate (a byproduct of wine production formerly used by French artillery)<ref name=“Chemistry323”/>
  • Wear reduction additives, to lower the wear of the gun barrel liners<ref>

    </ref>

  • Other additives
    • Ethyl acetate, a solvent for manufacture of spherical powder<ref name=“Chemistry296”/>
    • Rosin, a surfactant to hold the grain shape of spherical powder
    • Graphite, a lubricant to cover the grains and prevent them from sticking together, and to dissipate static electricity<ref name=“Chemistry306”/>

Manufacturing

The United States Navy manufactured single-base tubular powder for naval artillery at Indian Head, Maryland, beginning in 1900. Similar procedures were used for United States Army production at Picatinny Arsenal beginning in 1907<ref name=“Chemistry297”/> and for manufacture of smaller grained Improved Military Rifle (IMR) powders after 1914. Short-fiber cotton linter was boiled in a solution of sodium hydroxide to remove vegetable waxes, and then dried before conversion to nitrocellulose by mixing with concentrated nitric and sulfuric acids. Nitrocellulose still resembles fibrous cotton at this point in the manufacturing process, and was typically identified as pyrocellulose because it would spontaneously ignite in air until unreacted acid was removed. The term guncotton was also used; although some references identify guncotton as a more extensively nitrated and refined product used in torpedo and mine warheads prior to use of TNT.<ref name=“Naval29”>Fairfield, A. P., CDR USN Naval Ordnance Lord Baltimore Press (1921) pages 28–31</ref>

Unreacted acid was removed from pyrocellulose pulp by a multistage draining and water washing process similar to that used in paper mills during production of chemical woodpulp. Pressurized alcohol removed remaining water from drained pyrocellulose prior to mixing with ether and diphenylamine. The mixture was then fed through a press extruding a long turbular cord form to be cut into grains of the desired length.<ref name=“Naval31”>Fairfield, A. P., CDR USN Naval Ordnance Lord Baltimore Press (1921) pages 31–35</ref>

Alcohol and ether were then evaporated from “green” powder grains to a remaining solvent concentration between 3 percent for rifle powders and 7 percent for large artillery powder grains. Burning rate is inversely proportional to solvent concentration. Grains were coated with electrically conductive graphite to minimize generation of static electricity during subsequent blending. “Lots” containing more than ten tonnes of powder grains were mixed through a tower arrangement of blending hoppers to minimize ballistic differences. Each blended lot was then subjected to testing to determine the correct loading charge for the desired performance.<ref name=“Naval35”>Fairfield, A. P., CDR USN Naval Ordnance Lord Baltimore Press (1921) pages 35–41</ref><ref name=“Chemistry294”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) pages 293 & 306</ref>

Military quantities of old smokeless powder were sometimes reworked into new lots of propellants.<ref name=“Naval39”>Fairfield, A. P., CDR USN Naval Ordnance Lord Baltimore Press (1921) p.39</ref> Through the 1920s Dr. Fred Olsen worked at Picatinny Arsenal experimenting with ways to salvage tons of single-base cannon powder manufactured for World War I. Dr. Olsen was employed by Western Cartridge Company in 1929 and developed a process for manufacturing spherical smokeless powder by 1933.<ref name=“Ball”>Matunas, E. A. Winchester-Western Ball Powder Loading Data Olin Corporation (1978) p.3</ref> Reworked powder or washed pyrocellulose can be dissolved in ethyl acetate containing small quantities of desired stabilizers and other additives. The resultant syrup, combined with water and surfactants, can be heated and agitated in a pressurized container until the syrup forms an emulsion of small spherical globules of the desired size. Ethyl acetate distills off as pressure is slowly reduced to leave small spheres of nitrocellulose and additives. The spheres can be subsequently modified by adding nitroglycerine to increase energy, flattening between rollers to a uniform minimum dimension, coating with phthalate deterrents to retard ignition, and/or glazing with graphite to improve flow characteristics during blending.<ref name=“Chemistry328”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) pages 328–330</ref><ref name=“Profile136”>Wolfe, Dave Propellant Profiles Volume 1 Wolfe Publishing Company (1982) pages 136–137</ref>

Flashless propellant

Muzzle flash is the light emitted in the vicinity of the muzzle by the hot propellant gases and the chemical reactions that follow as the gases mix with the surrounding air. Before projectiles exit a slight pre-flash may occur from gases leaking past the projectiles. Following muzzle exit the heat of gases is usually sufficient to emit visible radiation – the primary flash. The gases expand but as they pass through the Mach disc they are re-compressed to produce an intermediate flash. Hot combustible gases (e.g. hydrogen and carbon-monoxide) may follow when they mix with oxygen in the surrounding air to produce the secondary flash, the brightest. The secondary flash does not usually occur with small-arms.<ref name=“Ballistics55”>Moss G. M., Leeming D. W., Farrar C. L. Military Ballisitcs (1969) pages 55–56</ref>

Nitrocellulose contains insufficient oxygen to completely oxidize its carbon and hydrogen. The oxygen deficit is increased by addition of graphite and organic stabilizers. Products of combustion within the gun barrel include flammable gasses like hydrogen and carbon monoxide. At high temperature, these flammable gasses will ignite when turbulently mixed with atmospheric oxygen beyond the muzzle of the gun. During night engagements the flash produced by ignition can reveal the location of the gun to enemy forces<ref name=“Chemistry3223”>Davis, Tenny L. The Chemistry of Powder & Explosives (1943) pages 322–323</ref> and cause temporary night-blindness among the gun crew by photo-bleaching visual purple.<ref>Milner p.68</ref>

Flash suppressors are commonly used on small arms to reduce the flash signature, but this approach is not practical for artillery. Artillery muzzle flash up to

from the muzzle has been observed, and can be reflected off clouds and be visible for distances up to

.<ref name=“Chemistry3223”/> For artillery the most effective method is a propellant that produces a large proportion of inert nitrogen at relatively low temperatures that dilutes the combustible gases. Triple based propellants are used for this because of the nitrogen in the nitroguandine.<ref name=“Ballistics59”>Moss G. M., Leeming D. W., Farrar C. L. Military Ballisitcs (1969) pages 59–60</ref>

Before the use of triple based propellants the usual method of flash reduction was to add inorganic salts like potassium chloride so their specific heat capacity might reduce the temperature of combustion gasses and their finely divided particulate smoke might block visible wavelengths of radiant energy of combustion.<ref name=“Chemistry323”/>

See also

References

Notes

Sources

External links

Cordite Explosives Firearm propellants Solid fuels

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smokeless_powder.txt · Last modified: 2020/03/12 18:38 (external edit)