MIL-DTL-83054C
3.7.2 Hydrolytic stability.
3.7.2.1 200°F Temperature exposure. Types I, II, and III baffle and inerting material shall withstand
exposure to a temperature of 200° +5°F (93.3° +2.8°C) and 95% relative humidity for a period of 4
days with no more than 75% loss in tensile strength. Type IV and V baffle and inerting material shall
withstand exposure to 200°F +5°F (93.3° +2.8°C) and 95% relative humidity for a period of six weeks
with no more than 75% loss in tensile strength (see 4.6.18.1).
3.7.2.2 160°F Temperature exposure. Types I, II and III baffle and inerting material shall withstand
exposure to 160° +5°F (71.1° +2.8°C) and 95 +5% relative humidity for a period of 4 weeks with a
maximum loss in tensile strength of 95%. Types IV and V baffle and inerting materials shall withstand
exposure to 160 +5°F (71.1°C +2.8°C) and 95 +5% relative humidity for a period of 24 weeks with a
maximum loss in tensile strength of 50% (see 4.6.18.2).
3.7.2.3 Immersion at 160°F. The type I, II, and III baffle and inerting material shall withstand
immersion in pure distilled water at 160° +5°F (71.l° +2.8°C) for 4 weeks with maximum loss in tensile
strength of 50% (see 4.6.18). Types IV and V baffle and inerting materials shall withstand immersion in
pure distilled water at 160° +5°F (71.1° +2.8°C) for 24 weeks with maximum loss in tensile strength of
80% (see 4.6.18.3).
3.7.2.4 Dry heat exposure. The material shall withstand exposure to dry heat. Maximum allowable
loss in tensile strength shall be 75% after 4 weeks at 250°F (121.l°C) (see 4.6.18).
3.7.3 Flame arrestor characteristics. The minimum acceptable flame arrestor characteristics criteria
shall be as follows (see 4.6.19.2):
Single void ignition overpressure limit at 3 psig initial pressure for:
a. Types I, II and IV baffle material at 10 and 20% ignition void: 15 psig maximum.
b. Types III and V baffle material at 30 and 35% void: 15 psig maximum
3.7.3.1 Minimum arrestor thickness. The minimum arrestor thickness (Tm) required to prevent flame
propagation for types III and V material shall be:
a. At 0 psig initial pressure and combustion volume of 16.7% shall be 3 inches maximum.
b. At 3 psig initial pressure and combustion volume of 16.7% shall be 5 inches maximum.
3.7.4 Corrosion and adhesion. The baffle material shall neither adhere to nor show any evidence of
pitting, erosion, or corrosion to metal plates when exposed in contact with UNS A97075 Aluminum
Alloy (7075) as specified (see 4.6.20).
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