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Physical foaming agents, such as nitrogen and some fluorocarbons, must be injected into the already fluidized polymer. Chemical foaming agents generally are low-molecular-weight inorganic or organic compounds and are usually supplied in powder or pellet form.Chemical foaming agents are added to the traditional injection molding process like any other additive master batch.
As physical foaming agent, the gas reduces the melt viscosity, which simplifies fast injection. The pressure drop during injection into the cavity triggers the formation of gas bubbles, which cause the melt to be foamed.
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