Natural Rubber Gaskets (Gum Rubber Gaskets) Polyisoprene (NR)

Custom Gasket Mfg. is a leading supplier of high-quality natural rubber gaskets, seals, and custom natural rubber products.

Our company’s reputation for excellence has been built on our ability to provide our valued customers with the most effective manufacturing solutions to meet their most demanding applications. Our main objective is to continuously exceed our customer’s expectations by providing them with high-performance gaskets and sealing products, competitive pricing, on-time delivery and exceptional customer service. Custom Gasket Mfg. is committed to consistently meet all of your blueprint specifications and tolerance requirements.

Custom Gasket Mfg. specializes in precision die cut and molded natural rubber gaskets and seals for applications and industries worldwide. Natural rubber is an elastic material that was originally derived from the milky sap or latex of some tropical plants (specifically the rubber tree). Natural rubber, also referred to as “gum rubber”, has many positive characteristics. It has superior resilience, high resistance to tear and abrasion, tensile strength, good compression set, and molding properties. Natural rubber is soft and displays good flexing qualities at low temperatures. It also has the ability to bond well to other materials such as metal. Natural rubber is non-toxic, non-marking, and resistant to water, acids, alcohol, organic salts, and alkalis. Natural rubber should not be used in applications that involve petroleum derivatives or exposure to chemicals. Natural rubber functions well in temperatures ranging from -60°F to +175°F.

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Die Cut Natural Rubber Gaskets

Natural (Pure Gum) Rubber Die Cut Gaskets

Custom Gasket Mfg. provides die cut natural (gum) rubber gaskets in a wide variety of grades, thicknesses and hardness. The standard thickness of natural rubber ranges from 1/64″ to 2″ thick. The hardness (durometer) of natural rubber ranges from 40 to 60 durometer, Shore A. Die cut natural rubber gaskets are generally tan or black in color with the exception of our premium grade “red” gum natural rubber, which is used when an optimum combination of tear and abrasion resistance are required. Natural rubber gaskets are available with or without pressure sensitive adhesive (PSA) backing.

Custom Gasket Mfg. Available Natural Rubber Grades

  • Commercial Grade Natural Rubber (Color: Black)
  • Premium Grade Gum Natural Rubber (Color: Red)
  • Natural Rubber, Style 28* (Color: Light Tan)
  • Pure Gum Floating Natural Rubber* (Color: Tan or Black)
  • Non-Floating Gum Natural Rubber* (Color: Dark Tan)
  • Protein Free (Synthetic Polyisoprene) Natural Rubber* (Color: Light Tan)

* produced entirely with FDA approved ingredients per 21 CFR 177.2600

Molded Natural Rubber Gaskets

Natural Rubber Molded Products

Custom Gasket Mfg. specializes in molded natural rubber gaskets and seals. Our custom natural rubber molding capabilities include Compression Molding, Transfer Molding, and Rubber Injection Molding. Natural rubber (NR) compounds are available from 20 to 90 durometer, Shore A. Natural rubbers color ranges from translucent (soft) to black (hard), and custom color compounding is available upon request. Natural rubber molding tolerances are complaint with rubber molding industry standard RMA A2 Precision tolerances.

Please visit our gasket materials page for more information on our extensive selection of materials.

For more information on custom natural (gum) rubber gaskets or to speak with one of our knowledgeable professionals, please feel free to Contact Us or complete our online Request For Quote form.

Call 800-985-6750 or email your inquiry to