Superior Bonding, Building Safety: DOWSIL™ 995 Silicone Structural Sealant Empowering Modern Architectural Curtain Walls

DOWSIL™ 995 Silicone Structural Sealant (formerly Dow Corning 995) is a one-component, neutral-curing, high-performance sealing material specifically designed for structural glazing applications. Featuring excellent unprimed adhesion to substrates such as glass, anodized aluminum, and fluorocarbon-coated metals, and complying with the GB16776-2025national standard, it serves as an ideal solution for high-rise curtain walls, structural glazing, and durable weatherproof interfaces.

under standard conditions (23℃, 50% RH), DOWSIL™ 995 exhibits a skin-over time of approx. 46 minutes and achieves full adhesion in 14-21 days, curing into a tough, elastic silicone rubber. It boasts a tensile strength of 2.12 MPa (ASTM) / 1.28 MPa (GB/T), a Shore A hardness of 38, and an impressive joint movement capability of ±50%. This ensures excellent elastic recovery against thermal expansion, wind loads, or inter-story drift, preventing embrittlement or cracking. The product meets all technical requirements of China's GB16776-2025, and has obtained the China Green Building Material Product (3-star) and China Green Product certifications, balancing high performance with environmental compliance.

As a sealant designed for structural applications, DOWSIL™ 995 is widely used in the following real-world scenarios:

• High-rise & Supertall Curtain Walls: Used in four-sided or two-sided Structural Silicone Glazing (SSG) systems to directly bond glass panels to metal frames, replacing mechanical clamps for a seamless visual aesthetic. Its superior weatherability ensures long-term elasticity under extreme temperature cycles (-40℃ to +150℃), resisting UV, rain, and ozone .
• Metal & Composite Panel Assembly: Ideal for structural fixing of anodized aluminum, granite, and most fluorocarbon-painted metal panels (e.g., aluminum curtain walls or decorative trims of office buildings), offering durable adhesion usually without the need for a primer.
• Protective & Impact-Resistant Glazing: Suitable for schools, street-front buildings, or window systems requiring impact resistance. The tough cured rubber assists in securing safety glass, enhancing overall structural safety.

that strict protocols must be followed to ensure structural safety: surfaces must be cleaned using the "two-rag solvent cleaning method" (solvents like toluene or MEK, adhering to safety rules) to remove grease and dust—soapy water is not permitted. Structural sealant depth and width must both be no less than 6mm, with width equal to or greater than depth; joints must remain immobile during curing. Furthermore, Dow's building science labs typically offer value-added services such as drawing reviews, adhesion testing, and compatibility testing to ensure the sealant works harmoniously with project-specific materials (e.g., backup rods, double-sided tapes), mitigating risks of discoloration or debonding.

With its stable chemistry, exceptional mechanical strength, and broad substrate versatility, DOWSIL™ 995 Silicone Structural Sealant continues to provide reliable structural bonding solutions for landmark buildings and commercial projects worldwide. It remains a trusted professional choice for both new curtain wall structural glazing and demanding weatherproof interface construction.