What is Addition Silicone?

Addition type liquid silicone rubber is a kind of silicone that is made of vinyl-containing polyorganosiloxane and polyorganosiloxane containing silicon-hydrogen bond, under the action of platinum catalyst, and cross-linked by hydrosilation reaction to form an elastomer. The material has no by-products during the cross-linking and curing process, has a small shrinkage rate, can be deeply cured, and has no corrosion to the contact substrate. It is the preferred potting material in the electrical and electronic industry.

Addition silicone applications:

Addition liquid silicone rubber is mainly used for potting of electronic components and circuit boards, such as driving power, sensors, photovoltaic junction boxes, etc., under high humidity, extreme temperature, thermal cycle stress, mechanical shock and vibration, mold, dirt, etc. Provides protection for electrical/electronic devices and components in harsh conditions.

In the actual use process of the addition type potting compound, the platinum catalyst in the system is easily affected by some substances and changes the original structure, and the catalytic activity of the hydrosilation reaction is reduced, which makes the addition type potting compound produce curing obstacles. That is what we often call "poisoning". The specific performance is that it is still liquid after curing, the surface is sticky after curing or the hardness is low after curing.

Addition encapsulants may come into contact with a variety of materials during application. If there is any doubt about whether certain surfaces or materials will inhibit curing, it is recommended to conduct a small-scale compatibility test to determine its suitability in specific applications. If there is a liquid or uncured product on the interface between the substrate surface and the cured silicone, it indicates poor compatibility. At this time, it is necessary to find out the reasons for curing obstacles according to specific phenomena and careful tests, and then eliminate them.