CRL Black Dow Corning® 999-A Silicone Building and Glazing Sealant

The CRL Dow Corning 999-A is a top-quality general-purpose silicone glazing sealant, perfect for both professional and DIY construction applications.
This one-part, high-modulus acetic cure silicone sealant cures with atmospheric moisture, ensuring a durable and flexible seal for wet glazing and curtainwall applications, such as glass, plastic, and solar panels.
It meets stringent industry standards including Federal Specifications TT-S-001543A and ASTM C-920, making it a reliable choice for conventional glazing tasks.
Note that it is not suitable for structural glazing or use on masonry, so be sure to review the label and Specification Data Sheet for complete guidance.
For more information on comparable sealants from brands like CRL, Dap, and GE, and to access the Sealant Estimator Chart, visit our website.