VAROX™ DCBP-50 Paste Organic Peroxide Accelerator
VAROX DCBP-50 Paste is a monofunctional organic peroxide at 50% assay in silicone oil. Owing to its low activation temperature, it is used for low temperature crosslinking of silicone and fluorosilicone rubbers without external pressure (hot air and/or IR crosslinking). Its paste form facilitates mixing and dispersion, and has the advantage of its crosslinking not being inhibited by oxygen. VAROX DCBP-50 Paste is especially good for continuous hot air vulcanization (HAV) in the temperature range of 70 - 140°C, since non-carbon black-loaded compounds containing this peroxide show little tendency to develop porosity, even when vulcanized without external pressure. However, postcuring at 12 to 24 hours at 150 - 250°C is recommended to prevent acidic decomposition of the rubber product and improve heat-aging resistance. Pre-mature crosslinking will not occur at temperature below 60°C. Usage levels are 1.1 - 2.3 phr. VAROX DCBP-50 Paste is compliant with FDA 177.2600 and BGVV (XV/3) for crosslinking silicone rubber.