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Roofing cardboard

Roofing cardboard is produced according to STAS 3135-82 of Ukraine, intended for use in the production of bitumen and bitumen-polymer roofing and waterproofing materials. A cardboard is producing by the following grades: A-350, A-300 (180-350 g/m2)

Indexes
Standard
А-350 Б-350
А-300
Б-300
Grammage, gsm
tolerance , g
350

+28
-18
350

+28
-18
300

+24
-15
300

+24
-15
Moisture, not more, %
6,0 6,0 6,0 6,0
Absorbency, % , not less
145 135 145 135
Time of impregnation, sec, not more
45 55 4040
Tensile strength, not less, N
186 196 176 186