Applications: Akrochem DDCBP-50 peroxide is used as a catalyst for cross-linking a variety of synthetic rubbers, primarily silicone; at temperatures above 100°C (100-115°C cures should be done under pressure and then post-cured 12-24 hrs. at 150-250°C). Typical usage level is 1-2 phr of product as supplied. DDCBP-50 has the lowest activation temperature and the highest rate of cure of any of the common peroxides used in cross-linking. It is ideally suited for fast curing of thin cross-sections in continuous cures. Special advantages of this peroxide: Not oxygen inhibited. Can be used in hot air cures at atmospheric pressures at temperatures from 150-250°C. Decomposition products have a very low vapor pressure so porosity does not normally occur. Has FDA acceptability under regulation 177.2600, rubber articles in repeated contact with food. Disadvantages: Caution must be used in dealing with the fast scorch times. The peroxide is sensitive to carbon blacks. Also, thick cross-sections may revert due to acid by-products of decomposition. Another use of DDCBP-50 is in combination with other peroxides. This may allow de-molding of parts that would otherwise hot tear by first curing with the DDCBP-50 before the second peroxide becomes active. Post-curing then finishes cure.

Information provided by Akrochem Corporation