Difference between low-temperature silicone and high-temperature silicone?

The application scenarios of silicone are becoming increasingly diverse, with low-temperature silicone and high-temperature silicone being suitable for different temperature environments and production needs due to their unique performance advantages. Although both belong to the silicone category, there are significant differences in chemical formulations, process requirements, performance, and application scenarios. This article analyzes the differences between the two from key dimensions, providing accurate references for industry procurement and application.

The key difference between low-temperature silicone and high-temperature silicone
1. Different temperature resistance range and formula. The main advantage of low-temperature silicone is its adaptability to extreme low-temperature environments. The structure is optimized by introducing methyl phenyl siloxane chains into the molecular chain. The typical low-temperature resistance range is -40 ℃ to 120 ℃. Its core advantage is that it will not become brittle at low temperatures and has a low compression permanent deformation rate. High temperature silicone is mainly made of vinyl silicone rubber, with heat-resistant agents added to enhance stability. The regular model can withstand temperatures of 200 ℃ to 300 ℃ for a long time, while the special model can withstand high temperatures of 400 ℃ for a short period of time, while also possessing basic cold resistance of -65 ℃.
2. Sulfurization process and production characteristics: Low temperature silicone gel adopts low-temperature rapid vulcanization technology, which can be formed at 120 ℃ without adding vulcanizing agents or secondary vulcanization. The production process does not produce waste gas, the product has no odor, and the dimensional stability is better. High temperature silicone is mostly a two-component heating vulcanization process that requires vulcanization molding at temperatures above 180 ℃. Some products require secondary vulcanization to improve performance, and the production cycle is relatively long. However, the molded products have better tear resistance and aging resistance, making them suitable for large-scale standardized production.

Only by accurately distinguishing the key differences between low-temperature silicone and high-temperature silicone can we achieve precise matching between material properties and application requirements, ensuring product reliability and optimizing production costs. With the development of formulation technology, the performance boundaries between the two are gradually expanding, but the core positioning based on temperature adaptability is still the key basis for selection. Therefore, it is necessary to know the differences between the two.