Tom, this is Dicup 40c that we use. The combustion is happening after curing...in dust that has been collected after the sheet faces have been sanded. The dust is collected in a bin, and sometimes in a few days time, the dust will begin to smolder. It doesn't slways occur, but occurs often...
Graham and Tom, we started off with 3 phr sulfur, 1.5 phr CBTS and 0.2 phr of TMTD..along with 5 phr ZnO. Reducing the sulfur to 2 phr helps some, but not enough. Also curing at a lower temperature helps some. The reson for the cure change, was there was some problem with spontaneous combustion...
We produce a light colored EPDM / SBR copolymer that is usually cured with peroxide. If we attempt to use a sulfur cure system, there is a serious shift in the materials color, becoming much yellower...and even has signs of scorched places (a golden brown). Is it possible to overcome this? Or...
