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The rubber durometer chart below gives you an idea of the rubber hardness that you want for your application. Generally, most rubber materials fall under the rubber durometer scale of Shore A. Thus, if you need a rubber or O-ring durometer that feels like a running shoe sole, review our rubber hardness chart below, then pick Shore 70A. Silicone Rubber Sheets. Silicone Rubber sheet stock is commonly used for hot stamping raised graphics or broad areas on flat, contoured or cylindrical shaped objects. United Silicone offers a wide variety of silicone rubber materials to meet requirements for heat resistance and thermal conductivity.