Rubber Molding Services

Custom Gasket Mfg. is a leading provider of rubber molding services for a wide range of industries and applications worldwide.

Three rubber molding capabilities include compression molding, transfer molding, and rubber injection molding.

Custom Gasket Mfg. specializes in high-quality molded rubber products including gaskets, seals, and custom rubber products in all rubber compounds and elastomers. 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. Custom Gasket Mfg. is committed to consistently providing custom precision molded rubber products to meet all of your blueprint and tolerance specifications.

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Rubber Compression Molding

Compression Molding

The most cost-effective and widely-used rubber molding method is compression molding. It is best used for low to medium production volumes for larger parts where tightest tolerances and flawless finishes are not required. This process involves compressing pre-heated material into a mold using a press, completely filling the mold cavity and holding it until cured.

Benefits of Compression Molding

  • Produces more intricate products
  • Fewer knit lines
  • Low tooling costs
  • Rapid production
  • Handles high durometer materials

Best Used For

  • Low to medium volumes
  • Bulky products
  • Large range of materials
  • Larger products
  • Gaskets, seals and o-rings

Transfer Molding

Rubber Transfer Molding

Like compression molding, transfer molding also utilizes a press and mold. The main difference is that in transfer molding, a piston forces the material through a passage into the mold cavity. While transfer molding can be more costly and take more time than compression molding, this method produces more complex products with a tighter tolerance control while still maintaining a higher production rate.

Benefits of Transfer Molding

  • Handles larger products
  • Maximum cavity pressure for more detailed designs
  • Faster mold setup
  • Higher production rate
  • Lower production costs

Best Used For

  • Low to medium volumes
  • All rubber durometers
  • Thicker walls
  • Better surface finish
  • Tight dimensions and tolerances

Rubber Injection Molding

Rubber Inkection Molding

Considered the most cost-effective molding process, rubber injection molding is the best choice for high-volume production runs of small size products that require tight tolerances and little to no finishing. Rubber injection molding involves feeding material into a press, which is then warmed and injected into a mold. The rubber injection molding process is the most precise compared to compression and transfer molding, because the injection process controls the pressure, temperature, and speed at which the material enters the mold. While injection molding costs more than compression and transfer molding due to higher tooling costs and longer initial setup times, it is still considered a cost-effective molding process.

Benefits of Injection Molding

  • Consistent
  • Tight tolerances
  • Faster production times
  • Cost-effective

Best Used For

  • For high-volumes
  • All rubber durometers
  • Smaller products
  • Intricate products

Cryogenic Deflashing and Finishing

Cryogenic Deflashing

Custom Gasket Mfg. offers the most versatile and effective way to remove flash from rubber products by means of Cryogenic Deflashing. Flash is typically found in areas where the mold comes together. This is when excess liquid mold material escapes from the cavity during production. In this process rubber parts are placed inside a barrel and liquid nitrogen is used to chill the parts so that the flash becomes brittle. The temperature of the flashing on the rubber is reduced to below its glass transition temperature, a point at which rubber behaves like glass and becomes easy to remove but does not crack the part. Once chilled, the machine tumbles the parts around on themselves allowing all the flash to break off. Cryogenic deflashing does not degrade the parts or harm their finish in any way. Edges stay sharp and recessed areas are completely cleaned of flash.

Rubber Molding Materials (Compounds)

Custom Gasket Mfg. has an extensive selection of rubber compounds to choose from. The most common molded rubber compounds we use include:

Custom Gasket Mfg. also has the ability to custom formulate compounds for your specific applications. Custom color compounds (and color matching) is available upon request. Rubber molding tolerances are compliant with rubber molding industry standard RMA A2 Precision tolerances.

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

For more information on our custom rubber molding services 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