Dow Corning 121 Structural Glazing Sealant is a fast-curing, two-part, neutral-cure RTV structural silicone sealant for use in structural and weatherseal applications. Dow Corning 121 Structural Glazing Sealant applications include the repair and/or replacement of structurally glazed glass and other substrates where a fast cure is required; on-site structural glazing, including storefront systems; attachment of panel stiffeners where quick cure is required; in-shop structural glazing where the use of a two-part pump is not feasible. Dow Corning 121 Structural Glazing Sealant offers a primerless adhesion to glass, alodine and anodized aluminum; adheres to Dow Corning-brand structural sealants for re-glazing applications and adhesion and structural strength is achieved in 24–48 hours. Note: There is no warranty on this product unless the user has already met the Dowsil structural requirement.
Repair and/or replacement of structurally glazed glass and other substrates where a fast cure is required including storefront systems
Primerless adhesion to glass, alodine and anodized aluminum
Adhesion to Dow Corning brand structural sealants for reglazing applications
Attachment of panel stiffeners where quick cure is required
In-shop structural glazing where the use of a two-part pump is not doable
Dow approved sealant guns: Sultzer MIXPAC™ DP 400-100-01, Albion P/N AT400 Standard t 400 mL cartridge air gun, COX A400HPMR and Newborn VR400.
Should not be applied:
to building materials that bleed oils, plasticizers or solvents – materials such as impregnated wood, oil-based caulks, green or partially vulcanized rubber gaskets, and tapes.
to surfaces that will require painting or staining
once the air temperature falls below 0°F.
on frost-laden or wet surfaces.
in areas where abrasion and physical abuse are encountered.
in below-grade or continuous water immersion applications.
to surfaces that will be in direct contact with food.
This product is neither tested nor represented as suitable for medical or pharmaceutical uses.