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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Chinese Factory Custom Silicone Rubber O-Rings Sealing Gaskets

Product Decription Item Good Weather Resistant Custom Molded EPDM Rubber Gasket Seals Material EPDM, NBR, SBR, NR, Silicone(VMQ), Neoprene(CR), HNBR,

NBR Rubber Seal Gaskets with Excellent Oil Resistance

Product Decription Item NBR Rubber Seal Gaskets with Excellent Oil Resistance Material EPDM, NBR, SBR, NR, Silicone(VMQ), Neoprene(CR), HNBR, XNBR,