UV Silicone Adhesives & Sealants — Pyra-Sil™
High-temperature silicone adhesives that cure in seconds under UV light — with secondary moisture cure ensuring full bond strength in shadow and hidden areas. Rated −45°C to 260°C for FIPG, conformal coatings, PCB protection, and industrial sealing.
Technical Specifications
Built for UV and Moisture-Cure Assembly
Pyra-Sil™ UV silicones fix in seconds under UV light and fully cure via moisture in
shadow areas — suited for high-throughput assembly where accessibility is limited.
Frequently Asked Questions
Common questions about Incure Pyra-Sil™ UV silicone adhesives and sealants.
-
UV/moisture dual-cure silicone uses two independent cure mechanisms. UV light triggers rapid cure in exposed areas — achieving fixation within seconds to minutes. Areas in shadow (under components, inside joints, or behind opaque substrates) cure via atmospheric moisture over 24–72 hours. This ensures complete cure across the entire application regardless of UV accessibility.
-
Most Pyra-Sil™ UV silicone grades achieve UV fixation in 120 seconds under standard UV light in the 365–405 nm range. Grade 865 cures in approximately 300 seconds. Shadow areas complete cure via moisture within 24–72 hours depending on humidity and film thickness.
-
All Pyra-Sil™ UV silicone grades are rated from −45°C to 260°C — covering automotive, industrial, and outdoor electronics applications exposed to extremes of temperature.
-
Pyra-Sil™ UV silicone is used for conformal coating on PCBA, form-in-place gaskets (FIPG), electronics potting and encapsulation, shadow-area sealing in connector backshells, automotive and industrial sealing, and high-altitude or outdoor electronic protection.
-
Yes. The moisture-cure secondary mechanism ensures full cure in shadow areas that UV light cannot reach — under tall components, inside cavities, and behind opaque parts. This eliminates uncured adhesive in complex assemblies where pure UV-cure adhesives would leave uncured pockets.
-
Yes. Cured Pyra-Sil™ UV silicone resists ozone, UV degradation, harsh weather, high humidity, and thermal cycling from −45°C to 260°C. It is widely used as a conformal coating on outdoor electronics, communications equipment, and high-altitude PCBs.