Dow Dowsil 781 Acetoxy Silicone Sealant Box of 12

Dow Dowsil 781 Acetoxy Glazing and Non-Porous Silicone Sealant Box of 12

Trade Box of 12 - Trade Price - Money Saver Deal

Colours: White, Black, Grey, Brown, Aluminium, Clear

Trade Option: Box of 12

Dow Dowsil 781 Acetoxy Medium to High Modulus Glazing & Non-Porous Silicone Sealant – Box of 12

The Dow Dowsil 781 Acetoxy Glazing Silicone Sealant is a high-modulus, fast-curing sealant designed for glazing, weatherproofing, and general construction applications. Supplied in a Trade Box of 12, this professional-grade sealant offers outstanding adhesion to glass, aluminium, steel, ceramics, and other non-porous surfaces, making it a must-have for glazing professionals, contractors, and builders.

Engineered with acetoxy-cure technology, Dowsil 781 forms a strong, durable, and permanently flexible bond, providing UV resistance, weatherproofing, and long-term durability. Its fast skin-over time of 5-10 minutes and excellent movement capability (+/-20%) ensure seamless application, reducing downtime and increasing productivity on-site. Whether used for internal glazing, curtain walls, cladding, or general sealing, this trade box of 12 cartridges delivers unbeatable value for professionals handling multiple projects.

Dow Corning 781 is a acetoxy silicone sealant available in 5 colours and clear which offers fast cure and good weathering characteristics, has excellent adhesive properties and is suitable for use on aluminium, glass, Formica, and most other non-porous surfaces, glazing applications, weather sealing of sheet cladding, frames, curtain walls, draught proofing and general internal and external sealing applications to non-porous surfaces.

Key Features & Applications

• Professional-Grade Glazing Sealant – Formulated for glass-to-glass and glass-to-metal applications, ensuring a strong and reliable bond.
• Medium to High Modulus Flexibility – Provides +/-20% joint movement capability for accommodating expansion and contraction.
• Fast Skinning & Curing – Skins over in 5-10 minutes and fully cures within 24 hours, reducing project downtime.
• Outstanding Weather & UV Resistance – Designed for exterior and interior applications, protecting against harsh environmental conditions.
• Certified for Contact with Potable Water – Listed by the UK Water Fittings Bye-Laws Scheme, making it safe for use in water-related applications once cured.
• Versatile Use – Suitable for glazing applications, weatherproofing sheet cladding, curtain walls, expansion joints, and general internal sealing to non porous surfaces.
• Available in a Range of Colours – Choose from White, Black, Grey, Brown, Aluminium, and Clear to match different materials and project aesthetics.

Also Available:

Dowsil 781 Acetoxy Silicone sealant in Singles

Benefits

• Medium to High modulus.
• Acetoxy cure method.
• Fast cure.
• Tack free in one hour.
• + or 20 Percent  Joint movement capability.
• 5 to 10 minutes Working time.
• 100% recovery.
• Excellent weather ability.
• + 5 to + 40 degree C Application Temperature Range.
• Listed by the UK Water Fittings Bye laws Scheme for use in contact with potable water once cured.
• Conforms to ISO 11600-G-20HM.
• 310ml Size standard Cartridges.

Dow Dowsil 781 Colour Options:

• White - 3295281-12
• Black - 3295257-12
• Grey - 3295265-12
• Brown - 3295249-12
• Aluminium - 3295281-12
• Clear - 3295036-12

How to Use Dow Dowsil 781 Acetoxy Silicone Sealant

1. Surface Preparation – Ensure surfaces are clean, dry, and free from dust, grease, or contaminants for optimal adhesion.
2. Cut the Nozzle – Trim the nozzle to the desired bead size and attach it to the cartridge.
3. Apply the Sealant – Using a sealant gun, apply a continuous, even bead along the joint or surface.
4. Tool the Joint – Use a smoothing tool or soapy water to achieve a neat, professional finish.
5. Allow to Cure – The sealant will skin over within 5-10 minutes and fully cure within 24 hours, depending on temperature and humidity.

Questions and Answers:

FAQs?

Why choose Dowsil 781 for glazing applications?
Dowsil 781 is specially formulated for non porous surfaces glass-to-glass and glass-to-metal sealing, providing superior adhesion, flexibility, and weather resistance. Its fast curing and movement capability, not suitable as a structural glazing sealant use Dowsil 895 or 995 Structural Glazing silicone.

Can this sealant be used for external weatherproofing?
Yes, Dowsil 781 is UV-resistant and fully weatherproof, making it perfect for exterior applications such as facade sealing, sheet cladding, and non porous curtain walls.

Does this silicone sealant work on porous surfaces like concrete or brick?
No, Dowsil 781 is designed for non-porous materials such as glass, metal, ceramics, and Formica. For porous surfaces, a construction and frame sealant should be used.

Is this sealant safe for use in areas exposed to water?
Yes, once fully cured, Dowsil 781 is certified safe for contact with potable water.

Can Dowsil 781 be painted over?
No, silicone sealants cannot be painted over. If a paintable finish is required, a hybrid or acrylic-based sealant paintable sealant would be a better option.

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