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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Custom Molded Rectangular Flat Silicone Rubber Gasket Seals

Product Decription Item Custom Molded Rectangular Flat Silicone Rubber Gasket Seals Material EPDM, NBR, SBR, NR, Silicone(VMQ), Neoprene(CR), HNBR, XNBR,

Custom Rubber Gasket WRAS Drinking Water Standard Flange Gasket

Product Decription Item Custom Rubber Gasket WRAS Drinking Water Standard Flange Gasket Material EPDM, NBR, SBR, NR, Silicone(VMQ), Neoprene(CR), HNBR,