Tonsan 1521 silicone potting compound is a two-part silicone potting material used in junction boxes to provide reliable sealing for diodes and connectors. Shows strong adhesion to PPO, TPT, brass and Sn-plated leads. Features excellent aging and heat resistance; is for automatic dispensing applications.
 
Beijing Tonsan Adhesives, www.ts.com.cn/en_index.asp
Christopher Associates, www.christopherweb.com