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Abstract
It is known that when EPDM rubber is blended with SBR a minimum of 30% EPDM is necesary to obtain satisfactory resistance to ozone cracking and weathering. More conservative scientists believe that, to be quite safe, 40% EPDM and 60% SBR should be used. The NBRI investigation initially covered blends containing 25% EPDM. The balance was made up of SBR and high styrene rubber which provided excellent resistance to weathering and a higher mechanical strength than is found in the straigt EPDM/SBR blends. In an extended research program the EPDM concentration was then decreased progressively to 10%. It was also discovered that in these blends SBR could be replaced by polybutadiene rubber and that reclaimed rubber could be used successfully. Laboratory investigations were followed by factory production of a few blends and processing through calenders was found to be easy. Eventually a flat roof was covred with sheets of these compounds using a specially developed adhesive to overcome the problems usually experienced with adhesives for EPDM blends.
It is known that when EPDM rubber is blended with SBR a minimum of 30% EPDM is necesary to obtain satisfactory resistance to ozone cracking and weathering. More conservative scientists believe that, to be quite safe, 40% EPDM and 60% SBR should be used. The NBRI investigation initially covered blends containing 25% EPDM. The balance was made up of SBR and high styrene rubber which provided excellent resistance to weathering and a higher mechanical strength than is found in the straigt EPDM/SBR blends. In an extended research program the EPDM concentration was then decreased progressively to 10%. It was also discovered that in these blends SBR could be replaced by polybutadiene rubber and that reclaimed rubber could be used successfully. Laboratory investigations were followed by factory production of a few blends and processing through calenders was found to be easy. Eventually a flat roof was covred with sheets of these compounds using a specially developed adhesive to overcome the problems usually experienced with adhesives for EPDM blends.
Date
9/1974
9/1974
Author(s)
Nix, M J
Nix, M J
Page(s)
Paper 32
Paper 32
Source
Society of Chemical Industry
Society of Chemical Industry
Keyword(s)
weather resistant; EPDM; sytrene rubber; ozone cracking resistant
weather resistant; EPDM; sytrene rubber; ozone cracking resistant