Polyethylene Foam Gaskets

Polyethylene Foam Gaskets are made by physical foaming process, it is non-toxic, tasteless, and has higher elasticity, meeting strict food-grade standards.

The difference between physical foaming and chemical foaming

1. Essentially different

Physical foam gaskets are foamed using physical principles, such as dissolving gas or liquid in plastic, and then expanding or vaporizing it. Chemical foaming is a method in which a specially added chemical foaming agent is thermally decomposed or a chemical reaction occurs between the raw material components to generate gas, so that the plastic melt is filled with cells.

2. Different requirements for foaming agents

The requirements for physical foaming agents are non-toxic, odorless, non-corrosive, non-combustible, good thermal stability, no chemical reaction in the gaseous state, and the diffusion rate in the plastic melt in the gaseous state is lower than that in the air. speed.

The requirement for the chemical foaming agent is that the stability does not need to be good, and the gas released by its decomposition should be non-toxic, non-corrosive, non-flammable, and have no effect on the molding and physical and chemical properties of the product. It can be controlled, and the foaming agent should have good dispersibility in the plastic.

3. Different craftsmanship

In the process flow, the order of physical foaming and chemical foaming is different. Physical foaming process mixing is to make foam first and then mix, chemical foaming is to mix first and then make foam.

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