Silicone Grommet with Firewall Seal Ring IP67 Rating High Temperature Heat Resistant Product Overview Silicone Grommet with Firewall Seal Ring IP67 Rating is engineered and moulded in-house by Dongguan Yunze Silicone Products Co., Ltd. in Dongguan, China. Manufactured from 100% platinum-cured silicone rubber (50°A Shore A, -40°C to +250°C / -40°F to +482°F), this panel grommet is designed for demanding industrial use where heat, chemical exposure and repeated assembly cycles