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High Grade Silicone gaskets are used during vacuum casting to seal perforated flask ring and casting chamber.   The Silicon acts as a sealing layer between the hot flask and the casting chamber flange adapter Gasket provides a good seal, allowing the vacuum to fully pull the molten metal into the flask.

These gaskets are die cut, have a thickness of 1/8" and come in various diameters to work with individual flask OD sizes. 

🔸 NOTE: Gasket has a wide surface area over 5/8" to assure a good seal.  NOTE: last picture shows a 2-1/2" Flask with seal.  

🔸 NOTE: last picture shows a 2-1/2" Flask with seal and graphite gasket is for reference how to use silicone and graphite together..see link >  https://www.ebay.com/itm/195030248357

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