Manufacturing / Compression Forming


Process Overview


Step 1

Molding material is generally preheated

Step 2

The material is then placed in an open heated mold cavity.

Step 3

The mold is closed, forcing material into contact with all mold areas.

Step 4

Heat and pressure are maintained until the molding material has cured.

Step 5

When the mold opens the part can be removed.

Step 6

Any excess material is trimmed from the part.



Q. What is compression molding?

A. Compression molding is a high-volume, high-pressure method suitable for molding complex, high-strength fiberglass reinforcements.

Q. What materials are used?

A. As for the material used, it requires the material that comes in sheet form, such as acrylic sheet, ABS sheet etc. Constant thickness and well blended material from extrusion or casting process for the sheet is required.

Q. Why compression molding vs. other processes?

A. The advantage of compression molding is its ability to mold large, fairly intricate parts. Compression molding produces fewer knit lines and less fiber-length degradation than injection molding.

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  • Lowest cost molds
  • Lower labor costs
  • Improved material efficiency
  • Minimized internal stress and warping
  • Excellent dimensional accuracy & stability
  • Minimal shrinkage
  • Capable of thick sections and larger parts



Any products with contoured plastic surfaces (such as side visors, acrylic photo frames, bonnet guards, etc.) can benefit from compressed molding.