Silicone Threaded Masking Plugs with Hex Head High Temperature Heat Resistant Product Overview Silicone Threaded Masking Plugs with Hex Head are engineered and moulded in-house by Dongguan Yunze Silicone Products Co., Ltd. Manufactured from 100% platinum-cured silicone rubber (60°A Shore A, -40°C to +250°C / -40°F to +482°F), these threaded plugs are designed for demanding industrial applications involving heat, chemical exposure, and repeated assembly cycles. Every batch is