# Effect of Rock Crystal Addition on the Properties of Silicone Pressure-Sensitive Adhesives

## TL;DR

Adding rock crystal to silicone adhesives improves their heat resistance without harming other properties, making them suitable for high-temperature applications.

## Contribution

Demonstrates rock crystal as an effective filler to enhance thermal resistance in silicone adhesives.

## Key findings

- Adhesive layers with rock crystal showed thermal resistance exceeding 225 °C.
- Rock crystal did not agglomerate and was compatible with the adhesive composition.
- New materials show potential for use in high-temperature applications like pipe connections.

## Abstract

In the presented work, a natural mineral—rock crystal—was used as a filler to obtain new silicone adhesive tapes. It was expected that, properly crushed, this hard mineral, consisting almost entirely of silica (silicon dioxide), should enhance the thermal resistance and cohesion of the self-adhesive composition with no/or low reduction in the rest of performance properties of the products. For this purpose, tests were conducted on the functional properties of new self-adhesive tapes, such as adhesion, cohesion, and tack. The obtained results confirmed the scientific assumptions and the thermal resistance of adhesive layers reached over 225 °C. The material itself turned out to not agglomerate in the adhesive composition and to be compatible with it. The new self-adhesive materials have application potential and can be used as materials for special applications in the field of heating, e.g., in connecting pipes, where thermal resistance and thermal expansion are of immense importance.