CRL Dow Corning® 999-A Clear Silicone Glazing & Building Sealant

• General Purpose Silicone Glazing Sealant
• Easily Applied One-Part, High-Modulus Formula
• Sealant Estimator Chart

CRL Dow Corning 999-A (SKU: 999AC) is a one-part acetic cure silicone sealant that cures with atmospheric moisture to form a durable, flexible seal ideal for wet glazing, curtainwall joints, and solar panel sealing. Designed for glazing glass and plastic, replacement glazing, and general construction sealing, it performs well in butt and lap shear joints for commercial building applications.


Basic Uses
Dow Corning 999-A is formulated for building construction glazing and sealing of curtainwalls, glass, plastic, and metal assemblies. Use for conventional glazing, solar panel edge sealing, and general-purpose silicone sealing where a high-modulus, one-part product is required.

Technical Data
Meets or exceeds: Federal Specifications TT-S-001543A (COM-NBS) Class A and TT-S-00230C (COM-NBS) Class A; ASTM C-920; Canadian CAN2-19.13-M82.

Limitations
Not intended for structural glazing or use on masonry. Refer to the cartridge label and Specification Data Sheet for full limitations and surface preparation guidance.

Comparable Sealants
CRL: 33S. Dap: 100% Silicone. Dow Corning®: 786; 732; 700; Glazing Silicone; General Purpose; Commercial Grade 100%; Tub, Tile and Ceramic, HVAC/R. GE®: 1200 Construction, 1000 Contractors, 1700 Sanitary. Tremco®: Proglaze, Tremsil 200, TremPro 644. OSI: HM-270. Pecora: 860, 863. Sonneborn: OmniPlus. Sika®: SikaSil®-GP.

Product Warning:

Dow Corning 999-A Silicone Building and Glazing Sealant is not intended for structural glazing or for use on masonry. Check cartridge label and Specification Data Sheet for additional limitations.

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