ONORM B 3646 Teil.8-1988 Roll roofings andprefabricated sheetsfor waterproofing, made ofbitumen or modified bitumen; testing;determination ofpolymer content
1988ONORM B 3646 Teil.8-1988 Roll roofings andprefabricated sheetsfor waterproofing, made ofbitumen or modified bitumen; testing;determination ofpolymer content