Adhetron Addy-Sil 353 Electronic-Grade Gel Silicone Coating 2000 g

Adhetron Addy-Sil 353 is a two-component, optically clear, electronic-grade silicone gel encapsulation and coating material. The product has been developed for transparent potting and encapsulation applications of finished circuit boards, hybrid circuits, and power supplies. It is positioned for electronic protection applications that require flexibility, repairability, and high temperature resistance. For this reason, it should be evaluated not as a structural adhesive, but rather as a gel-based encapsulation solution that protects sensitive electronic components.

Technical Structure and Key Properties of Addy-Sil 353
The product has a silicone-based formulation and is applied with a 100:100 mixing ratio. According to the official technical datasheet, it is optically clear in color, has a viscosity range of approximately 900–1100 cps, and a specific gravity of 1. A 30-minute pot life at 25°C and a 24-hour curing time provide ease of application in controlled dispensing and electronic assembly processes. Shrinkage remaining below 1% after curing is also a significant advantage in terms of dimensional stability, especially for sensitive electronic protection applications.

Electrical and Thermal Performance
According to the official data, Addy-Sil 353 has an operating temperature range of -65°C to +200°C. Its dielectric strength is specified as 25 kV/mm at a thickness of 1.6 mm, and its volume resistivity values are at the level of 10^15 Ω-cm. This makes the product suitable not only for physical protection, but also for electronic encapsulation applications where electrical insulation is critical. The technical datasheet also provides a 0.25% weight loss after 1 week at 150°C and NASA outgassing data, supporting the product’s performance in controlled electronic environments.

Application Method and System Compatibility
During application, the two components must be mixed in the correct ratio and then applied to the relevant electronic area in the form of potting or encapsulation. The product is designed to form a transparent protective gel layer on finished circuit boards, hybrid circuits, and power supplies. Official application areas include transformers, cable end sleeves, capacitors, coils, IGBT components, insulators, bushings, transducers, and re-enterable telephone cable splices. Its definition as re-healable after curing provides an important process advantage in electronic systems that require maintenance and re-access.

Applications and Key Advantages of Addy-Sil 353
This product can be used particularly in automotive electronics, telecommunications, power electronics, and general electronics manufacturing applications. Thanks to its transparent structure, it stands out in modules that require visual inspection, while its gel character makes it especially suitable for protective encapsulation scenarios where vibration and thermal stresses are significant. Its main advantages can be summarized as optical clarity, high temperature resistance, low shrinkage, electrical insulation, and repairable structure. According to the official brand information, Adhetron is a brand of Pulsar Chem. Industry and Trade Co. INC.; the brand is introduced as originating from Connecticut, USA, and operating its global distribution network through Türkiye. Although the technical datasheet does not emphasize any specific international certification, the inclusion of NASA outgassing data is noteworthy in terms of technical transparency.