Dow Corning Dowsil 791 Weather Proofing Low Mod Silicone Sealant 310ml Cartridge

Dow Corning Dowsil 791 Weatherproofing Low Mod Building and Frame Premium Silicone Sealant 310ml Cartridge

Dowsil 791 Colours:

1. White - 4024912
2. Black - 4024907
3. Grey - 4024909
4. Brown - 4024908
5. Bronze - 4024913
6. Stone - 4024911
7. Buff - 4024914
8. Limestone - 4024910
9. Anthracite - 4028426
10. Ral 7016 Anthracite - 4024905
11. Translucent 791T - 4028427

Dow Corning Dowsil 791 Weatherproofing Low Modulus Silicone Sealant – 310ml a low modulus, high-performance sealant designed for weatherproofing and sealing in the home, commercial and industrial applications.It provides excellent flexibility, making it ideal for use in expansion joints and movement joints where structural flexibility is required.Designed to adhere strongly to a wide range of surfaces, including glass, metals, masonry, concrete, and plastics, Dowsil 791 is formulated to withstand harsh weather conditions, UV rays, and temperature extremes.

Dowsil 791 Low modulus neutral cure silicone sealant and premium building and frame sealant that gives excellent un-primed adhesion to both porous and non-porous building substrates, making it the perfect partner for pointing doors and window frames, for weather sealing of curtain walling and roof lines, building facades and expansion joints to walls.

This neutral cure sealant is perfect for external weatherproofing, offering long-lasting protection against rain, wind, and environmental stress.Its non-corrosive formulation makes it suitable for use on sensitive materials, including metals and coated surfaces.Whether you're sealing curtain walls, cladding panels, or perimeter joints, Dowsil 791 ensures a durable, flexible seal that stands the test of time.

Key Features Dowsil 791 Coloured Silicone sealant

• Low Modulus Flexibility: Provides +/- 50% movement accommodation, making it ideal for expansion joints and structural flexibility.
• Weatherproof and UV Resistant: Offers long-term durability against rain, wind, temperature changes, and UV exposure.
• Neutral Cure: Non-corrosive to sensitive materials, such as aluminium, steel, and coated surfaces.
• Excellent Adhesion: Bonds strongly to glass, concrete, brickwork, metals, and plastics.
• Wide Application Range: Suitable for both external and internal use, including commercial facades, cladding, and curtain walls.
• Long-Lasting Protection: Designed to perform reliably in harsh weather conditions without shrinking, cracking, or discolouring.

Dow 791 Applications

• Facade and Curtain Wall Sealing: Provides a flexible, weatherproof barrier for large-scale building exteriors.
• Expansion and Movement Joints: Ideal for joints that require flexibility to accommodate thermal and structural movement.
• Perimeter Sealing: Ensures a durable seal around windows, doors, and cladding panels.
• Concrete and Masonry Sealing: Bonds effectively to masonry, stone, and brickwork, preventing water ingress.
• Commercial Roofing and Waterproofing: Protects roof joints and parapets against moisture and weather damage.

How to Use Dow Corning Dowsil 791 Weatherproofing Silicone Sealant

1. Surface Preparation: Ensure that all surfaces are clean, dry, and free of dust, grease, and contaminants.
2. Cut the Nozzle: Trim the nozzle to the desired bead size and attach it to the cartridge.
3. Apply the Sealant: Use a sealant gun to apply a continuous, even bead along the joint.
4. Tool the Joint: Smooth the bead with a smoothing tool or soapy water to achieve a neat, professional finish.
5. Allow to Cure: The sealant will skin over in approximately 30 minutes and fully cure within 7 days, depending on environmental conditions.

Dowsil 791 Specification:

• Safe for use on Sealed units due to its neutral cure will not damage the bonding glues or foils of the sealed units.
• Pointing to Polycarbonate, and most plastics
• Has excellent weathering characteristics
• Resistant to ozone, UV radiation and temperature extremes.
• Correctly formed joints have a movement capability + or - 50%
• 20 to 30 minutes working time a fast cure tack free in 2 hours,
• Application Temperature Range 5 to +40 Degree C
• Cure Type: Neutral
• Skin Over Time: Approximately 30 minutes
• Full Cure Time: 7 days
• Movement Capability: +/- 50%
• Application Surface: Glass, masonry, concrete, metals, plastics, and coated surfaces
• Weather Resistance: Waterproof, UV-resistant, and flexible

Questions and Answers:

FAQs Dowsil 791

1.What makes Dow Corning Dowsil 791 Silicone Sealant suitable for long-term weatherproofing? The Dow Corning Dowsil 791 is specially formulated to withstand long-term exposure to extreme weather conditions.Its UV-stable composition prevents degradation caused by prolonged sun exposure, while its waterproof and temperature-resistant properties protect against rain, wind, and temperature fluctuations.Unlike rigid sealants, the low-modulus formula allows the sealant to flex and accommodate joint movement without cracking, ensuring a durable and lasting seal.These features make it ideal for applications such as curtain walling, cladding, and perimeter sealing on both commercial and residential buildings.

2.Can this sealant be used for both interior and exterior applications? Yes, the Dow Corning Dowsil 791 Silicone Sealant is designed for use in both interior and exterior environments.It resists UV radiation, extreme temperatures, and moisture, making it an excellent choice for weather-exposed areas.Additionally, its neutral cure formulation emits low odour and is safe for indoor applications.

3.Does this silicone bond to a variety of building materials? Absolutely.The Dowsil 791 bonds effectively to a wide range of substrates, including glass, aluminium, steel, concrete, brickwork, and plastic.For optimal adhesion, surfaces should be clean, dry, and free from contaminants.In some cases, a primer may be required for porous or difficult substrates.

4.Is this sealant suitable for use with sensitive materials such as aluminium and plastics? Yes, Dow Corning Dowsil 791 uses a neutral cure formula, which is non-corrosive and safe for use on sensitive materials, including aluminium, coated metals, and plastics.This makes it an excellent choice for applications involving metal-framed windows, curtain walls, and composite panels, where maintaining the integrity of the materials is crucial.Unlike acidic cure sealants, which can cause corrosion or staining, the neutral cure formulation ensures compatibility and long-term performance without damaging delicate substrates.

5.What steps should be taken to ensure a professional finish when applying this sealant? To achieve a professional finish with Dowsil 791 Weatherproofing Silicone Sealant, follow these steps:

• Surface Preparation: Clean all surfaces thoroughly to remove dirt, grease, and debris.For porous substrates, apply a suitable primer if necessary.
• Cut the Nozzle: Trim the nozzle at an angle that matches the desired bead size.
• Apply the Sealant: Use a steady hand to run a consistent bead along the joint.Ensure complete coverage for a watertight seal.
• Tool the Sealant: Smooth the bead immediately using a tooling stick or finger dipped in soapy water to create a neat, polished finish.
• Allow to Cure: Let the sealant cure according to manufacturer guidelines (typically skins over in 30 minutes and fully cures within 24-48 hours).Proper application and tooling will result in a clean, professional-grade seal.

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Dowsil 791 Conforms to:

• ISO 11600-25LM
• Meets ISO specification 9047 class 50%

Dowsil Construction and Frame sealant.

All Frame and Glazing silicones.

All General Construction sealants.