Lead-free Primer Strategy May 2018 Joel Sandstrom Senior ... · Small Caliber Percussion Primer •...
Transcript of Lead-free Primer Strategy May 2018 Joel Sandstrom Senior ... · Small Caliber Percussion Primer •...
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Lead-free Primer Strategy May 2018
Joel SandstromSenior ChemistFederal Cartridge Company
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Small Caliber Percussion Primer• 200 Year Evolution
• Primer Ignition – heat transfer into the propellant bed
- Flame DDNP + pyrotechnic system
- Fuel chlorates, phosphorus
- Slag fulminates, azides, lead styphnate
• Federal Gold Medal Primer- Low overpressure- No PETN
- Primary heat transfer via high heat capacity metal
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Catalyst Primer Technology Primer Components and Manufacturing Consistent with Federal Gold Medal Primer Standards
The Catalyst primer employs nitro-thermite technology producing high sustained heat. The bismuth/aluminum thermite reaction creates excellent heat transfer into the propellant bed
Conventional Primer Cup
Catalyst Pyrotechnic
NITROCELLULOSE ALUMINUM BISMUTH OXIDE
Conventional Boxer Anvil
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U.S. Mil No.41 Primer
CatalystNo.41 Primer
Case mouth
Primed 5.56mm caseSame No.41 cup / anvil Catalyst No.41 primer charge weight is 37% lower than U.S. Mil No.41 primer
Catalyst Thermal Output
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U.S. MilNo. 41
CompositeNo. 41
5.56mm Primed Brass
Ignition ProgressionIgnition Progression
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Catalyst primer exhaust is free of Lead, Barium, and Antimony
Non-Toxic Exhaust Products
0
10
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30
40
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60
CO2 H2O N2 CO H2 CH4 H2S COS C Al2O3 BaS Bi Pb PbS Sb
WG
T %
Reaction Products at 298oK, Fraunhofer Thermodynamic ICT Code
Barium Lead Antimony Aluminum
Bismuth
Condensed Phase Exhaust Products: Catalyst vs Lead
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Ballistics ExampleGM308M, 168 gr Gold Medal Match test date 4/23/2018
Primer Velocity / Std Dev Pressure / Std Dev
GM210M 2631 / 5 56,595 / 777
GM210NX 2620 / 7 59,524 / 763
notes:
NX pellet charge weight was higher than GM210M pellet charge for this sampleNX primed brass sample was not load adjusted