RTV Silicone Adhesives — Pyra-Sil™

One-part and two-part RTV silicone adhesives rated from −45°C to 260°C — designed for deep section potting, encapsulation, form-in-place gasketing (FIPG), and seam sealing. Moisture, heat, and UV/moisture dual cure grades available for manual, static mix, and automated high-volume dispensing.

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Product Range

Technical Specifications

Applications

Built for Sealing, Potting & Gasketing

Pyra-Sil™ RTV grades for potting, FIPG, and seam sealing — rated −45°C to 260°C.

Dark green circuit board with electronic components for Pyra-Sil™ RTV silicone electronics potting and encapsulation
Electronics Potting & Encapsulation
Pot sensors, modules, and PCB assemblies in deep housings without UV access — 2-part and moisture cure grades fill voids completely and protect against vibration, moisture, and thermal cycling.
Mechanic working on an automotive engine for Pyra-Sil™ RTV silicone form-in-place gasket FIPG sealing
Automotive FIPG & Engine Sealing
Dispense directly onto flanges, sumps, and housings to form compression-ready gaskets in-place — no pre-cut gasket required. Rated to 260°C for continuous underhood service.
Window frame installation in a construction building for Pyra-Sil™ RTV silicone building and construction seam sealing
Building & Construction Sealing
Seal window frames, panel joints, and curtain wall seams against weather, ozone, and UV degradation — flexible cure maintains adhesion through building movement and seasonal cycling.
Blue elastomeric vibration isolation block supporting a load for Pyra-Sil™ RTV silicone vibration and shock dampening
Vibration & Shock Isolation
Pyra-Sil™ 875 cures to a Shore A0–A5 elastomeric rubber specifically designed for severe impact cushioning and vibration damping in industrial and electronic assemblies.
White electrical enclosure on a yellow wall for Pyra-Sil™ RTV silicone electrical enclosure weatherproof IP sealing
Electrical Enclosure IP Sealing
Seal lid flanges and cable entry points on junction boxes, switchgear, and outdoor enclosures to achieve IP67/IP68 weatherproof ratings against rain, dust, and condensation.
Industrial mechanical parts and tools on a workbench for Pyra-Sil™ RTV silicone mechanical assembly and gasketing
Mechanical Assembly & Gasketing
Bond and seal dissimilar substrates — metals, plastics, and glass — in pumps, compressors, and hydraulic assemblies. One-part grades simplify gasketing without catalyst measuring or pot-life management.
FAQ

Frequently Asked Questions

Common questions about Incure Pyra-Sil™ RTV silicone adhesives.

  • RTV (room-temperature vulcanising) silicone cures through moisture, heat, or a catalyst reaction at ambient conditions — no UV light source is required. Incure Pyra-Sil™ RTV grades are ideal for deep section potting, FIPG, and enclosed joints where UV light cannot reach. UV silicone cures rapidly on UV-exposed surfaces but requires shadow-cure chemistry or mechanical fixturing for hidden areas.

  • Pyra-Sil™ RTV silicones are available in one-part and two-part formulations. Two-part grades include 100:5 (Pyra-Sil™ 621), 1:1 (Pyra-Sil™ 892), and a shock-isolation grade with a 15-minute pot life (Pyra-Sil™ 875). One-part grades (Pyra-Sil™ 873, 874, 915) cure by moisture, heat, or UV/moisture dual cure with no mixing required, simplifying dispensing from cartridges, bottles, or automated systems.

  • Pyra-Sil™ 873 reaches a tack-free surface in 15 minutes and fully cures in 3 hours at room temperature. Cure can be accelerated to 15 minutes at 150°C for production environments. Its low viscosity allows it to self-level across flat and contoured surfaces for uniform sealing coverage.

  • Yes. Pyra-Sil™ 874 and 892 are specifically formulated for form-in-place gasket (FIPG) applications. They are dispensed directly onto flanges or housings, self-level to fill the sealing groove, and cure in place to form a durable, compression-ready elastomeric gasket. Pyra-Sil™ 915 also supports FIPG with UV/moisture dual cure for rapid fixation in UV-accessible areas.

  • All Pyra-Sil™ RTV silicone grades are rated from −45°C to 260°C for continuous service. This range covers automotive underhood environments, industrial heat-cycling conditions, and outdoor weathering from sub-zero climates to elevated process temperatures.

  • Yes. All Pyra-Sil™ RTV grades support high-volume automated dispensing including pneumatic cartridge dispensers, pressure-fed reservoirs, and robotic bead dispensing. Two-part grades (621, 875, 892) are compatible with static mixing nozzles and 100:5 or 1:1 volumetric dispensing equipment.

Ready to Specify Pyra-Sil™ RTV Silicone Adhesives?

Tell us your application — substrate, cure method, and temperature requirements —
and our team will recommend the right Pyra-Sil™ grade and dispensing format.

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