Pressure gel process to produce the insulators as outlined below:

1. Material Pretreatment

A certain percentage of epoxy resin specially for pressure gel, curing agent, fillers, colorants mix the mixing tank. Stirred for 1 to 2 hours to mix material evenly. Air bubbles are removed by creating vacuum in the chamber.

2. Injecting, forming

Pretreated epoxy resin mixture is injected into the APG mold preheated to specific temp., with the help of pressurized pump. The mixture is released from the mold after thermal gel forming and gets semi-finished products.

APG mold should be set aside with suitable gap in a specific parting line surface in order to discharge the air from the mold in the process of injecting material. After the gel injection into the mold, the epoxy resin due to rapid heating fill into the small gaps, leaving the mold in a sealed state, so the material within the mold under pressure gradually gel to get a close texture product. In order to make the mold parting line surface, leaving some gap not only helps exhaust but also makes a reliable seal, which require higher accuracy of the mold, especially for some of the complex structure of the insulators, the mold is with much higher accuracy requirements. In short, Pressure gel mold is equipped with a high technical content.

3. Curing

After ejection, the products are transferred to the oven, and the finished products get dense and low internal stress after slow cooling under constant temperature of 140deg 10 hours.