Momentive SILTRUST™ RTV681LV Silicone Thermal Control Coating

Momentive SILTRUST™ RTV681LV is a white, durable silicone thermal control coating developed for long term reliability in harsh environmental conditions. This highly reflective coating can provide excellent adhesion to many metal, composite, and organic substrates and maintains flexibility down to -60°C.

RTV681LV consists of two parts with a 1:1 mix ratio by weight; it is a semi-flowable paste but can also be diluted for uniform spray coating. This low outgassing material offers fast, full cure from 1 hour at 100°C to 150°C, to enable continuous production but also cures at room temperature if required.

Potential applications include satellites, aerospace, aviation, and sensors where a passive thermal control coating is needed.

RTV681LV meets ASTM E595 low outgassing levels to minimize contamination under vacuum and high temperature exposure.

Key Properties:

• Highly reflective with typical solar absorption of 0.16 at 0.006” thickness
• Thermal emittance greater than 0.88
• Non-specular coating
• Convenient 1:1 by weight mix ratio
• Long working time at 77F/50%RH
• Full cure from 1 hour at 100°C to 150°C, also cures at room temperature
• Flexible coating capable of performing a 3.2 mm bend radius down to -60°C
• Dielectric Insulator
• Highly reflective even after hundreds of hours of elevated temperature or UV exposure