Sequence Number Testing Item Technique Index 1 cold resistance and thaw resistance property invisible layer and uneven 2 PH value(20¡æ) 6.0~9.5 3 precipitate (vol. %) before agimg¨Q0.25 precipitate can pass 180¦Ìm sifter after agimg¨Q1.00 precipitate can pass 180¦Ìm sifter 4 fluidity flux of foam liquid is bigger than that of standard referenced liquid 5 expansion foam ,(20¡æ) ¨R50 6 25% drainage time, min(20¡æ) ¨R5.0 7 50% drainage time, min(20¡æ) ¨R10.0 8 extinguishing time, s ¨Q120 9 1% burn-back time, s ¨R30