MIL-PRF-63460E
3.3.2 Interference with chemical agent detector paper. CLP applied to and allowed to soak
into chemical agent detector paper shall cause no discoloration, in the soaked portion of the
paper (see 6.5).
3.4 Environmental requirements.
3.4.1 Humidity resistance. CLP, applied to three test panels, shall provide humidity
resistance so that not more than three corrosion dots, none exceeding one millimeter in length,
width, or diameter, shall be evident on test panels after 900 hours exposure in a humidity cabinet.
The total of such corrosion dots on all three test panels shall not exceed three.
3.4.2 Salt-spray resistance. CLP, applied to three test panels, shall provide salt-spray
resistance so that not more than three corrosion dots, none exceeding one millimeter (length,
width, or diameter), shall be evident on test panels after 100 hours exposure to a spray of 5 %
salt solution. The total of such corrosion dots on all three test panels shall not exceed nine.
3.4.3 Corrosion-protection from propellant reaction products. CLP, applied to three test
panels, shall provide corrosion protection from propellant reaction so that no rust spots involving
visible pitting or etching of the metal, size two millimeters or larger (length, width or diameter),
shall be evident on any of three test panels after exposure to the ignition of WC 844 propellant,
(see 6.6) and 96 hours conditioning at 49 ± 2 °C (120 ± 4 °F) and 100 % Relative Humidity.
3.4.4 Water displacement and water stability. CLP, applied to three test panels, shall displace
water so that there is no evidence of rust, mottling, or other abnormal surface stains on the test
panels after storage in the static humidity chamber for one hour.
3.5 Operating requirements.
3.5.1 Firing residue removal. CLP shall provide cleaning capability to remove a minimum
average of 80 % of the residue generated from the ignition of WC 844 propellant.
3.5.2 Weapon performance. CLP shall provide cleaning, lubricating and preservative
characteristics to support operating requirements of the MACHINE GUN: 5.56MM, M249,
hereafter referred to as M249 (see 6.9.1 through 6.9.3) when exposed to the following
conditions.
3.5.2.1 Cold temperature. CLP applied to a machine gun that is then exposed to severe cold
conditions shall prevent any Class II or III stoppages, shall allow no more than two Class I
stoppages in 200 rounds, and shall sustain a rate of fire of at least 650 rounds per minute.
3.5.2.2 Sand/dust environments. CLP applied to a machine gun that is then exposed to very
fine blowing dust shall prevent any Class II or III stoppages, shall allow no more than five Class
I stoppages in 500 rounds, and shall sustain a rate of fire of at least 650 rounds per minute.
3.5.2.3 Salt water immersion. CLP applied to a machine gun that is then immersed in salt
water for one minute and stored in high humidity conditions for ten days between firing cycles
shall prevent any Class II or III stoppages, shall allow no more than five Class I stoppages in
1000 rounds, and shall sustain a rate of fire of at least 650 rounds per minute.
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