List of DURACON® POM grades

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8. Mold Design

8.5 Gas Vents

Since improper design of gas vents may cause gas burn marks and mold deposit, full consideration should be taken for gas vent design. With structures in which gas is expelled from the parting line, a gas vent as shown in Fig. 8-5 is effective, as gas can be expelled from the entire circumference of the molding. The mating surface of the mold is roughened over several mm from the circumference of the cavities to a depth of 1/100 to 2/100 mm, and grooves of a depth of about 1 mm are machined from that section to the outside of the mold.

Fig. 8-5 An example of gas vent