DOWSIL™ 121 Structural Glazing Sealant
Product:
DOWSIL ™ 121 Structural Glazing Sealant is a two-part silicone formulation designed specifically for use in structural glazing applications in field and factory applications. The material is supplied in a two-part cartridge in which the catalyst is a smooth, white paste and the base is tinted either black or gray. Once catalyzed, the material cures into a medium-modulus, flexible silicone rubber that is flexible for use in structural and weatherseal applications. It can be used in deep, narrow joints to obtain a complete cure.
DOWSIL™ 121 Structural Glazing Sealant cures in deep section within 24 hours and generally achieves full adhesion within 48 hours. However, full cure time depends on joint design, substrate type, temperature and humidity.
Features & benefits:
– Approved for structural and weatherseal applications (1)
– High level of mechanical properties
– Structural capability
– Odorless and non-corrosive cure
– Excellent stability through wide temperature range: -50°C to 150°C
– Stable viscosity for base and catalyst, no heating required
– The cured product exhibits excellent weathering characteristics, and a high resistance to ultra-violet radiation, ozone, heat and humidity
– Primerless adhesion to alodine and anodized aluminum (2)
– Adhesion to DOWSIL™ structural sealants for reglazing applications
– Adhesion and structural strength achieved in 24–48 hours
– Meets ASTM C 719 Class 25 (G, A, O)
– Meets ASTM C1184 Structural Sealant Specification
1 All structural glazing applications MUST be reviewed by the Dow technical staff. If their recommendations are followed, Dow will issue a project-specific adhesive warranty.
2 Certain sealing materials used in the anodizing process may increase the potential for use of primer to gain adhesion within a 24-hour period. DOWSIL™ Primer-C OS is recommended for fast and consistent adhesion, especially to Kynar, polyester powder coat and other high-performance substrates approved for architectural structural glazing applications.
Applications:
– 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 viable
More details can be found in the technical data sheet (available in english).