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Sealant Calculator
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Dowsil 795 is a one-part neutral-cure silicone building sealant engineered for structural glazing and high-performance weather sealing in commercial facade systems. This architectural-grade RTV silicone provides ±50% movement capability and industrial-strength tensile adhesion to support heavy glass or metal panels under extreme wind loads.
It complies with rigorous global standards including ASTM C 1184 for structural applications and ASTM C 1248 for non-staining performance on sensitive natural stone substrates like granite and limestone. The medium modulus formula ensures a stress-absorbing seal that maintains long-term durability against UV exposure and ozone without corroding sensitive metals or bleeding into porous masonry.
Frequently Asked Questions
Is DOWSIL™ 795 suitable for structural glazing?
Yes. DOWSIL™ 795 is widely used in structural silicone glazing (SSG) applications and has been approved for use in curtain wall systems globally. It bonds glass to metal, aluminium, or structural framing with excellent long-term durability.
Does it require a primer for adhesion?
DOWSIL™ 795 offers excellent unprimed adhesion to many substrates, including glass and anodised aluminium. However, Dow recommends adhesion testing, and primers (e.g., DOWSIL™ 1200 OS) may be required for porous or coated surfaces depending on site conditions.
Can DOWSIL™ 795 be painted?
No. Like most silicones, DOWSIL™ 795 cannot be painted. It is available in a range of colours to match common construction materials. Choose the correct colour during planning to avoid coating requirements.
What is the skin and cure time?
DOWSIL™ 795 becomes tack-free in 30–60 minutes, with a tooling window of around 10–20 minutes. Full cure is achieved in 7–14 days depending on joint depth, temperature, and humidity. Approx. 3 mm cures in 24 hours at 25°C, 50% RH.
Is it resistant to weather, UV, and salt spray?
Yes — DOWSIL™ 795 is formulated for long-term exterior exposure. It resists UV radiation, extreme temperatures, salt spray, acid rain, and ozone. It is ideal for coastal buildings, high-rise façades, and industrial zones.
What’s the shelf life and storage condition?
Shelf life is 12 months from the date of manufacture when stored unopened below 30°C. Store in a dry, well-ventilated place out of direct sunlight. Always check date codes before use for critical projects.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Structural silicone glazing (SSG) | Provides structural bonding of glass to metal or frame with high UV resistance | Glaziers, Façade Engineers |
| Curtain wall perimeter sealing | Maintains weather-tight joints in high-rise and commercial curtain walls | Facade Contractors, Builders |
| Sealing precast concrete joints | Accommodates ±50% joint movement and withstands thermal cycling | Concrete Panel Installers, Commercial Builders |
| Weatherproofing aluminium cladding systems | Non-corrosive seal for panel-to-panel and panel-to-frame interfaces | Architectural Cladders, Installers |
| Expansion joints in masonry and facade systems | Maintains adhesion and flexibility across extreme weather exposure | General Contractors, Remedial Works |
How to Apply DOWSIL™ 795 Silicone Sealant
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1. Surface Preparation
Ensure all substrates are structurally sound, clean, dry, and free of dust, oil, coatings, and contaminants. Use a two-cloth solvent wipe method with isopropyl alcohol (IPA), acetone, or Dow R40 Cleaner.
Pro Tip: Use Dow 1200 OS Primer for porous or powder-coated substrates and always perform an adhesion test on site. -
2. Masking & Joint Design
Apply masking tape along joint edges for clean lines. Use backer rod (PE or PU foam) to control joint depth and prevent 3-sided adhesion. Recommended joint width-to-depth ratio is 2:1 for optimal movement capability.
Pro Tip: Do not apply sealant without backing material — it reduces performance and joint longevity. -
3. Sealant Application
Apply DOWSIL™ 795 using a caulking gun at a steady rate. Hold nozzle at a 45° angle and ensure the bead is forced into contact with both sides of the joint. Avoid air entrapment. Tool within 10–20 minutes to smooth surface and ensure full bond.
Timing: Tool within 20 minutes. Tack-free in 30–60 minutes. Full cure: 7–14 days depending on joint depth, temperature, and humidity.Pro Tip: Avoid tooling with soapy water — use clean, dry tooling tools for best finish and performance. -
4. Finishing & Clean-Up
Immediately remove masking tape after tooling. Clean excess sealant with solvent (before skinning) and wipe tools with cloth. Cured sealant must be removed mechanically.
Pro Tip: Dispose of waste sealant and solvent-soaked rags safely. Avoid skin contact with uncured sealant during extended use.
Limitations & Safety
Limitations of Use
- Not suitable for aquarium glazing or food contact surfaces
- Do not apply to surfaces with frost, condensation, or standing water
- Not paintable – colour must be selected prior to application
- Incompatible with bituminous or tar-based materials
- Not recommended for sealing polystyrene foams or polyethylene plastics
- Do not use in underground or submerged conditions (e.g. tanks, immersed expansion joints)
- Do not use for structural bonding of glass without full project validation by Dow
Health & Safety Guidance
Personal Protective Equipment (PPE)
Use protective gloves, safety glasses, and long-sleeve workwear when applying. Avoid prolonged skin contact. Wash hands after use and before eating or drinking.
Ventilation
Use in well-ventilated areas. While VOC content is low, confined space application should follow standard industrial ventilation procedures.
Fire & Storage Safety
Product is non-flammable. Store in cool, dry conditions below 30°C. Keep out of direct sunlight and sealed in original packaging.
Emergency First Aid
- Eyes: Rinse with clean water for 15 minutes and seek medical advice.
- Skin: Wipe off excess, then wash thoroughly with soap and water.
- Inhalation: Remove to fresh air. If irritation persists, seek medical help.
- Ingestion: Do not induce vomiting. Rinse mouth and contact a poison control centre or doctor.
Note: Refer to the product SDS for full risk and exposure management details.
Adhesion & Surface Preparation Guide
Glass (Annealed, Toughened, Laminated)
Surface Preparation
Clean using a two-cloth solvent wipe (e.g. IPA or DOWSIL™ R40 Cleaner) until no residue remains. Avoid touching cleaned surface.
No primer typically required
Excellent unprimed adhesion. Conduct adhesion testing on site-specific glass coatings or films.
Anodised or Powder-Coated Aluminium
Surface Preparation
Wipe with clean cloth and compatible solvent. If powder-coated, lightly abrade glossy surfaces and repeat solvent wipe.
Primer may be required
Use DOWSIL™ 1200 OS Primer where surface variability or abrasion is present. Conduct site testing for powder-coated or painted frames.
Concrete, Brick, and Precast Panels
Surface Preparation
Ensure fully cured (min. 28 days), dry, and free of dust, laitance, or surface contaminants. Clean with stiff brush or light abrasive pad, then solvent wipe.
Primer required
Prime with DOWSIL™ 1200 OS Primer to ensure adhesion to porous substrates. Allow to dry before sealant application.
Stainless Steel & Galvanised Metal
Surface Preparation
Lightly abrade, then wipe with clean cloth and approved solvent (e.g. Xylene or IPA). Ensure dry, clean finish before sealing.
Primer may be required
Adhesion is generally good, but primer may improve performance in critical joints. Use DOWSIL™ 1200 OS Primer as needed.
Plastics (Polycarbonate, PVC, etc.)
Surface Preparation
Clean with mild solvent (test compatibility). Lightly abrade if surface is glossy. Confirm chemical compatibility before use.
Primer often recommended
Use primer where adhesion is uncertain. Dow recommends performing field adhesion tests prior to installation.
Painted or Coated Substrates
Surface Preparation
Ensure paint is fully cured, non-chalking, and adherent. Wipe clean with solvent cloth. Avoid loose coatings.
Primer optional based on coating
Adhesion varies by paint chemistry. Always test. Use primer if adhesion is poor or substrate is unknown.
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