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Use DOWSIL™ 795 Silicone Building Sealant for: Structural glazing, panel bonding, facade sealing, and weatherproofing on commercial and residential projects
DOWSIL™ 795 Silicone Building Sealant is a premium, one-part, neutral-cure silicone sealant designed for long-term durability in structural and weatherproofing applications. It offers outstanding unprimed adhesion to a variety of building substrates including glass, aluminium, steel, masonry, stone, and plastics. With its high movement capability (±50%), exceptional UV and weather resistance, and wide service temperature range, DOWSIL™ 795 is ideal for Australian construction environments. Available in multiple standard colours with custom options, it ensures both performance and aesthetic compatibility for facade systems and curtain walls.
Key Features of DOWSIL™ 795 Silicone Building Sealant
- Excellent unprimed adhesion to most construction materials including anodised and painted aluminium
- ±50% movement capability for superior joint flexibility
- Outstanding UV, weather, and temperature resistance from -40°C to 149°C
- Low VOC content (30 g/L) for safer indoor air quality compliance
- Non-sagging formula allows easy vertical and overhead applications
Technical Overview
- Chemical Properties: One-part, neutral-cure, RTV silicone
- Application Temperature Range: 5°C to 50°C (41°F to 122°F)
- Movement Capability: ±50% joint movement
- Service Temperature Range: -40°C to 149°C (-40°F to 300°F)
- Hardness (Shore A): 35
- Tack-Free Time: Approx. 3 hours
- Full Cure Time: 7–14 days at 25°C and 50% RH
- VOC Content: 30 g/L (SCAQMD compliant)
Trade Professional Information
- Required Tools: Standard caulking gun, masking tape, joint backer rod, tooling spatula
- Trade-Specific Tips: Always test adhesion on porous substrates; use masking for clean lines
- Common Issues and Solutions: If curing is delayed, check ambient humidity; avoid applying to wet surfaces or during rain
Storage and Shelf Life
- Storage Requirements: Store below 27°C in a dry, well-ventilated area
- Shelf Life Information: 12 months from manufacturing date in original unopened packaging
- Temperature Considerations: Avoid prolonged storage above 27°C
Certifications
- ASTM C920 Type S, Grade NS, Class 50
- ASTM C1184 Structural Silicone
- CAN2-19.13-M82 (Canada)
- TT-S-00230C and TT-S-001543A (Federal Specifications)
Frequently Asked Questions About DOWSIL™ 795 Silicone Building Sealant
Q: How do I apply DOWSIL™ 795 to vertical panels or overhead joints?
A: Use a caulking gun with a consistent bead and tool within 15 minutes before skin forms. Apply masking tape for neater lines and remove immediately after tooling.
Q: How durable is DOWSIL™ 795 in extreme Australian climates?
A: DOWSIL™ 795 is engineered to withstand UV, rain, salt air, and extreme temperatures from -40°C to 149°C, making it ideal for Australia’s harsh environmental conditions.
Q: Is DOWSIL™ 795 compatible with painted aluminium and coated glass?
A: Yes, it adheres well to anodised, alodined, and many Kynar-painted aluminium surfaces. Always test unfamiliar substrates to ensure adhesion.
Q: Why is my sealant not curing properly?
A: Ensure sufficient humidity is present and avoid sealing in confined joints. Cure time is 7–14 days, but factors like temperature and ventilation may affect performance.
Q: Is this product safe to use indoors?
A: Yes, it has a low VOC rating of 30 g/L and cures with a low-odour byproduct, making it safe for most indoor applications when used with adequate ventilation.
Use DOWSIL™ 795 Silicone Building Sealant for:
- Structural glazing and curtain wall applications
- Weather sealing of expansion joints and façade panels
- Bonding metal panels and stiffeners in ventilated façades
Why Use DOWSIL™ 795 Silicone Building Sealant:
- Reliable structural strength under high wind loads
- Long-lasting durability in outdoor conditions
- Low maintenance with excellent aesthetic finish
- Backed by global testing and certification standards
How to apply DOWSIL™ 795 Silicone Building Sealant:
- Clean surfaces to remove dust, oils, old sealants, or coatings
- Install backer rod or joint filler as required
- Mask off areas to create neat sealant lines
- Apply sealant with positive pressure using a caulking gun
- Tool sealant within 15 minutes to ensure proper adhesion and finish
- Remove masking immediately after tooling
DOWSIL™ 795 Silicone Building Sealant limitations:
- Not suitable for underwater or below-grade applications
- Should not be painted – paint will not adhere to cured silicone
- Do not apply to surfaces that bleed oils or solvents
- Not recommended for totally confined joints without air exposure
Safety precautions when using DOWSIL™ 795 Silicone Building Sealant:
- Personal Protective Equipment: Use gloves, safety glasses, and protective clothing
- Ventilation: Apply in well-ventilated areas to avoid fume build-up
- Handling: Avoid contact with skin and eyes; do not ingest
- Dispose of waste and containers according to local regulations
DOWSIL™ 795 Silicone Building Sealant can be used on the following substrates:
- Glass – including laminated and coated types
- Aluminium – anodised, alodined, and painted
- Stone – granite, marble, limestone (non-staining)
- Concrete and brick – cured and cleaned
- Plastics – including rigid PVC and polycarbonate (test recommended)
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