Master Bond MasterSil 153Med is a two component, paste silicone compound for high performance bonding and sealing. This is an addition cured system and does not require exposure to air for complete cross-linking. With a convenient one to one mix ratio by weight, it will not outgas while curing. Other features include remarkable flexibility and high temperature resistance while maintaining very low exotherm over an exceptionally long working life. It bonds well to a wide variety of substrates including excellent bond strength to cured silicone rubber. MasterSil 153Med withstands severe thermal cycling, vibration and shock and has a service temperature range of -65°F to +400°F.