About O ring & gasket molding, here are two kinds of molding to make this kind of part, one is die cutting, another is compression molding. 
With smooth surface, it will easy to stick together, here are also two ways to solve this problem, one is adding talcum powder, and another is make it with matte surface.

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High Quality Low Price Auto Engine Gasket Kit

Brand Name:NEWAY Molding process:Compression/ injection molding Shore Value:35-90A Service:OEM/ODM/OBM, Custom Logo / Packaging, 3D design drafting

Molded Rubber Parts, Rubber Seal, Rubber Bellow, Oil Seal, Rubber Motorcycle Gasket in OEM Service

Brand Name:NEWAY Molding process:Compression/ injection molding Shore Value:35-90A Service:OEM/ODM/OBM, Custom Logo / Packaging, 3D design drafting