Dow Corning Dowsil 796 Silicone Sealant Coloured PVC-U Wood Aluminium

Dow Corning Dowsil 796 LM Silicone Sealant Coloured PVC-U Wood and Aluminium

Dow Corning Dowsil 796 Single Tube Colours:

4001876 - Anthracite

3320316 - Black

3279677 - Brilliant White

3308626 - Brown

3308642 - Bronze

3320308 - Grey

Overview:

Dow Corning Dowsil 796 LM is a low modulus, neutral cure silicone sealant designed for perimeter sealing around PVC-U, timber and aluminium window and door frames. It provides excellent adhesion to both porous and non-porous construction substrates and is safe to use against insulated glass units thanks to its neutral curing system.

Formulated for long-term weatherproofing, this sealant accommodates joint movement without cracking, resists UV and temperature extremes and delivers a neat, colour-matched finish for internal and external frame and façade joints.

Key Features

• Low modulus silicone with ±25% joint movement capability

• Neutral cure system – non-corrosive to metals and sensitive substrates

• Excellent adhesion to PVC-U, wood, aluminium, masonry and many coated surfaces

• Suitable for perimeter glazing and frame-to-building joints

• Good weather, UV and temperature resistance for internal and external use

• Non-slump formulation for clean, professional beads

• Working time around 20–30 minutes; tack-free in roughly 2 hours

• Available in multiple colours to match coloured frames and trims

Specifications

• Brand: Dow (Dowsil)

• Product Name: Dowsil 796 LM Silicone Sealant

• Type: Low modulus neutral cure silicone

• Cartridge Size: 310ml (single tube)

• Cure System: Neutral (oxime/neutral cure, non-corrosive)

• Movement Capability: ±25% (ISO 11600 F & G 25LM)

• Working Time: Approx. 20–30 minutes (at standard conditions)

• Tack-Free Time: Approx. 2 hours (conditions dependent)

• Full Cure: Typically 24–48 hours depending on joint size, temperature and humidity

• Application Temperature: Approx. +5°C to +40°C

• Use Location: Interior and exterior joints

• Typical Substrates: PVC-U, painted and stained wood, aluminium, masonry, brickwork and many coated metals

• Colours: Anthracite, Black, Brilliant White, Brown, Bronze, Grey

Applications

• Perimeter sealing around PVC-U, timber and aluminium window and door frames

• Frame-to-masonry and frame-to-cladding junctions on façades

• Weatherproof sealing in curtain walling and cladding systems

• Expansion and movement joints within the recommended movement range

• General interior and exterior joint sealing where a flexible, colour-matched silicone is required

How to Use

• Ensure all surfaces are clean, dry and free from dust, grease, loose material and old sealant. Use a suitable cleaner where necessary.

• Mask adjacent surfaces if required for a clean edge. Cut the cartridge nozzle at an angle to match the desired bead size.

• Load the cartridge into a standard sealant gun and apply a steady, continuous bead into the joint, ensuring full contact with both sides.

• Tool the sealant immediately after application using a suitable tooling tool or a gloved finger lightly moistened with soapy water to achieve a smooth finish.

• Remove masking tape before skin formation. Allow the sealant to cure undisturbed; skin typically forms within about 30 minutes and full cure is normally reached within 24–48 hours, depending on joint depth and conditions.

Dow Corning now Dow Dowsil Demonstration Video:

Dow Corning Dowsil 796 LM Silicone Sealant – Key FAQs

• Is this sealant suitable for both interior and exterior use?
  Yes, it is formulated for internal and external joints and offers long-term resistance to weather, UV exposure and temperature changes.

• Can I use it directly against sealed glass units?
  Yes, the neutral cure system is non-corrosive and suitable for use against most insulated glass units when used in perimeter frame joints.

• What types of frames and substrates does it adhere to?
  It bonds well to PVC-U, painted or stained wood, aluminium and many masonry and cladding substrates when properly cleaned and prepared.

• How much joint movement can it accommodate?
  The low modulus formulation offers ±25% movement capability, making it ideal for perimeter and expansion joints subject to thermal or structural movement.

• Is this silicone paintable once cured?
  No, like most neutral cure silicones it is not paintable. Choose the closest colour match to the frame or substrate for the best visual result.

• How long does it take to cure fully?
  It typically skins within around 30 minutes, becomes tack-free in about 2 hours and reaches full cure in 24–48 hours, depending on joint size and site conditions.

• How should I store unused cartridges?
  Store upright in a cool, dry place away from direct sunlight and heat sources. Ensure the nozzle is sealed after first use to limit air exposure and maintain shelf life.

Dow Dowsil Construction and Frame Sealant.

All Frame and Glazing Silicone Sealants.