Why do you have to use Nitrogen for welding Polyethylene and Polypropylene?

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. For good welds you must use at least a 50/50 mixture of nitrogen and compressed air. You can also use just nitrogen.
Article Title:
Why do you have to use Nitrogen for welding Polyethylene and Polypropylene?
Article Summary:
Explanation on why nitrogen must be used for welding polyethylene and polypropylene.
Article Date:
10/29/2007
Article ID:
729
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