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What is Transfer Molding?

Transfer molding is a process where the amount of material is measured and inserted before the molding process takes place. The material is then preheated and loaded into a pot and a plunger is then used to force the material from the pot through the runner system into the mold cavities. The mold remains closed as the material is inserted and is opened to release the part from the runner. The mold walls are heated to a temperature above the melting point of the mold material; this allows a faster flow of material through the cavities.

Benefits of Transfer Molding

  • Durable and dimensionally stable parts
  • Prevents corrode or rust
  • Impact resistant, chemical resistant
  • Minimal release of airborne emissions during production
  • Uniform thickness of parts

Transfer Molding - Step 1 

Step #1 - A piece of uncured rubber is placed into a portion of the mold called the "pot." The plunger (on the top-most part of the mold) fits snugly into the "pot."

Transfer Molding - Step 2 

Step #2 - The mold is closed up and under hydraulic pressure the rubber is forced through the small hole (the "gate") into the cavity. The mold is held closed while the rubber cures.

Transfer Molding - Step 3 

Step #3 - The plunger is raised up and the "transfer pad" material may be removed and thrown away.

Transfer Molding - Step 4 

Step #4 - Mold is opened and the part can be removed. The flash and the gate may need to be trimmed.

| About West Coast Gasket | Capabilities | Technical Information | Literature Download | Client Upload | Glossary | Contact |
| Gaskets | Extrusions | Molding | Lathe Cutting | Precision Water Jet Cutting | Request for Quote | Resource Links |

We're more than a gasket company. We're specializing in the manufacture of all types of industrial gaskets,
molded and extruded products, including lathe cut washers, metal stampings and custom waterjet cut parts.

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