PE elastomer made foaming effect often can greatly reduce the density of the material, reduce costs, and daily some shock or water absorption performance of insulating material will be used, such as foam, foaming agent is divided into physical foaming agent and chemical foaming agent. Do foam like steamed bread yeast yeast, is the gas released by decomposition of foaming agent, form of blast hole surrounded by a rubber, rubber expansion form a sponge.

The main factors that determine foaming are：

1.The gas emission and decomposition rate of foaming agent

This is somewhat similar to the quality and activity of yeast. Generally, the decomposition speed of foaming agent with low decomposition temperature is higher than that of the same foaming agent with small particle size and high processing temperature. In general, the decomposition rate of large gas production is fast, forming a large bubble hole, easy to form a hole effect.

2.The influence of foaming auxiliaries

Foaming agent whose decomposition temperature is higher than TPE processing temperature cannot be foamed in normal production, so some auxiliary agents need to be added to reduce the decomposition temperature.

3.Glue viscosity

Viscosity affects the diffusion rate of gas in the binder. Viscosity is too low, gas diffusion is too fast, easy to overflow, not easy to produce bubbles. If the viscosity is too high, it will limit the expansion of the gas, internal pressure small aperture. If you do the hole opening effect can be smaller viscosity, closed hole effect can be larger.

[answer] from the practical application, TPE foam rate alone is too small. For example, in the case of TPE yoga mat, materials with high foam rate are added with appropriate proportion, such as EVA. In this way, the foaming rate of TPE is improved to meet the requirements of product foaming.