Nitrogen must be used to prevent oxidation for both polyethylene and polypropylene. If you weld these materials with compressed air, the combination of the compressed air and heat cause oxidation, and the welds will not be as strong. You must use at least a 50/50 mixture of nitrogen and compressed air for good welds. You can also use just nitrogen.
Title: Why do you have to use Nitrogen for welding Polyethylene and Polypropylene?
Description: Explanation on why nitrogen must be used for welding polyethylene and polypropylene.
Published: 10/29/2007
Last Edited: 1/16/2023
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