Composite burning

Group 1 Chlorate and metal perchlorate report or whistling compositions Dry non-gelatinized cellulose nitrates Barium peroxide/zirconium compositions Burn very violently Flash shells (maroons) Casings containing flash compositions Sealed hail-preventing rockets Mass explosion risk... 

Group 2 Nitrate/metal/sulphur compositions Compositions with >65% chlorate Black powder Nitrate/boron compositions Burn violently Large firework shells Fuse unprotected signal flares Non-pressed report bullets (bird scarers) Report cartridges (unpacked) Black matches (uncovered) Accelerating single-item explosions... 

Mixture Application Mil Spec illustrative Composition Burn Time Range, sec/cm Temperature Coeff, %/°K r — Delay Time Change on Storage, sec/year-cm... 

The rate at which the surface of the composition burns, linear burning rate , can be calculated using Equation 3.1, where r is the linear burning rate in mm s-1, P is the pressure at the surface of the composition at a given instant, fi is the burning rate coefficient and a is the burning rate index. 

Type of ammunition—Jacketed bullets produce substantially fewer FDR particles than unjacketed bullets. Primer type (size, composition, burning characteristics) can influence the number of primer particles produced. The temperature and pressure achieved by the burning of the propellant determines the power and velocity of the bullet which can influence the number of particles deposited. 

Group 3 Nitrate/metal compositions Burn fast Large firework shells Burn very... 

The phenomenon of Senko-hanabi occurs after a black powder-type composition burns out at the cinder stage it coheres into a fire ball and emits many pine needle-like sparks from its surface as it reacts with oxygen in the air. In this case the remaining charcoal and potassium... 

These are small paper tubes from W to diameter 2 to 3H long hlled with composition burning different colors with a duration of one minute and used lor producing ika ditferent designs used in fireworka axbibitionei such as portraits, mottoes etc. The eases ere rolled and rammed with funnel and rod. as previously described. 

EFFECT OF MOTION ON COMPOSITION BURNING Unprimed stars may be extinguished ( blown blind ). 

These materials have different effects on the way in which the composite burns. Precipitated calcium carbonates reduce acid gas emissions by reaction and neutralisation during combustion. This may in turn increase the ease of combustion, as the halogen has a gas-phase quenching effect. 

The dry mixed compositions burn faster than the wet mixed compositions because of significant higher grain porosity (Table 18.4). This also effects a lower spectral efficiency because of shorter residence time of Mg particles in the hot flame and thus less complete bum out. Dry mixing was never reahzed on a larger scale. 

---