Roofing Bitumen Gost 9548-74 Grade Bnk-45/19. Needle Penetration Depth At 25°C. 0.1 Mm 160-220 Softening Temperature Of The Material Along The Ring And Ball, °C 40-50 Solubility In Chloroform Or Toluene, %, Not Less Than 99.5 Change In The Mass Of The Material After Heating, %. Not More Than 0.80 Depth Of Penetration Of The Needle At A Temperature Of 25°C In The Remainder After Warming Up, % Of The Initial Value, Not Less Than 60 Flash Point, °C, Not Less Than 240 Mass Fraction Of Water, Not More Than Traces Penetration Index From 1.0 To 2.5 Mass Fraction Of Paraffin, %. No More Than 5.0
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