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Gas Assist Injection Molding Process

Plastic parts produced by gas-assist injection molding have solid skins and hollow cross sections. The polymer is short-shot into the mold. Then inert gas is injected into the melt either through the nozzles or through mold mounted injector pins. The gas forces the melt against the cold walls of the mold, forming a solid skin. Gas follows the path of least resistance (normally the thickest, hottest core sections of the part) and forms hollow areas.

Advantages over alternative methods

  • Smooth outer finish, hollow core

Gas Assist Advantages

  • Excellent surface finish.
  • Reduced cycle times. (Shorter cooling times.)
  • High stiffness-to-weight ratio. (Heavy cross sections with hollow cores.)
  • Improved flow strength. (Lower injections pressures.)
  • Eliminates sink marks in thick parts and parts with tubular shapes.
  • (Internal gas pressure packs out the part.)
  • Lighter weight.
  • Lower molded in stresses.
  • Lower cavity pressure.
  • Improved dimensional stability.
  • Transparent parts can be produced.
  • Material savings (weight, cost) for thick-walled parts up to 40%

Leading Edge Technology

At Denver Plastics, combining leading edge production with superior customer service is a corporate philosophy we strive for everyday. From start to finish, from operators to plant supervisors, everyone participates in quality. This is demonstrated by our ISO 9001-2015 certification. We also are building partnerships with our suppliers for continuous improvements. At Denver Plastics, we provide innovative solutions for your injection molding needs.

Large Tonnage Capacity

Great ideas come in all shapes and sizes. Denver Plastics full complement of machinery enables us to produce products from one ounce to 24 pounds. Our machines range from 77 ton to 2200 tons.

ISO 9002 Certification

See our ISO Certification page for a look at any of our companies' ISO certificates and to learn what they mean for you and your product.

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