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When a facade demands both unyielding structural integrity and long-term weatherproofing from a single product, the complexity on site can multiply. DOWSIL 795 simplifies this. It delivers high-performance structural glazing and robust weather sealing from a single, architectural-grade silicone, ensuring both safety and a durable envelope.
Many sealants tackle either structural glazing or weather sealing. This product is engineered for both. It carries high wind loads while maintaining a flexible, watertight envelope. This dual capability streamlines specification and reduces complexity, offering a versatile solution for facades where performance cannot be compromised. It’s an architectural-grade, neutral-cure silicone sealant built for the demands of modern construction.
This is a one-part, neutral-cure silicone that extrudes easily across a wide temperature range, making application straightforward. Effective surface preparation is key: clean all joints, removing contaminants like grease, oil, dust, and old sealants. Masking tape helps achieve neat lines, removed immediately after tooling. While generally not requiring primer on non-porous surfaces, a test placement is always recommended, especially on porous substrates, to confirm optimal adhesion. The sealant cures to a medium modulus silicone rubber upon exposure to atmospheric moisture, requiring 7–14 days for full cure and 14–21 days for full adhesion.
DOWSIL 795 accommodates significant movement in properly designed joints. It is engineered for ±50 percent movement of the original joint dimension, ensuring durability against structural shifts and thermal expansion.
Yes, DOWSIL 795 meets ASTM C 1184 for structural silicone sealants. For structural applications, a prior review and approval by a Dow sales application engineer is required to ensure correct design and use.
No, DOWSIL 795 is documented as non-staining. It shows "None" for staining on granite, marble, limestone, brick, and concrete as per ASTM C 1248 testing.
No, DOWSIL 795 should not be painted. Most paints do not adhere effectively to silicone sealants, which would compromise the finish and protection.
| Application | Key benefit | Primary trades |
|---|---|---|
| Structural glazing of glass and panel systems | Meets ASTM C 1184 for structural silicone sealants. Provides sufficient strength to support glass and panels under high wind loads. | Glaziers, Façade Installers |
| Weather sealing of building envelopes | Accommodates ±50% joint movement. Maintains integrity under severe weather from -40°C to 149°C, resisting sunlight, rain, and ozone. | Commercial Builders, Waterproofers |
| Panel stiffener attachment | Delivers strong, durable attachment for various panel systems. Offers unprimed adhesion to common construction materials. | Façade Installers, Commercial Builders |
| Sealing natural stone and masonry | Certified non-staining on granite, marble, limestone, brick, and concrete, preventing expensive aesthetic defects. | Stonemasons, Commercial Builders |
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.
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.
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.
Immediately remove masking tape after tooling. Clean excess sealant with solvent (before skinning) and wipe tools with cloth. Cured sealant must be removed mechanically.
Store at or below 27°C for a shelf life of 12 months from the date of manufacture. Dispose of material and empty containers in accordance with all local, state, and federal regulations. Empty containers may contain hazardous residues.
Proper surface preparation is critical for adhesion and sealant performance. Always ensure surfaces are clean and free from contaminants.
Surface prep: Clean all joints. Remove grease, oil, dust, water, frost, surface dirt, old sealants, glazing compounds, and protective coatings. Surfaces must be dry and structurally sound.
Primer: Generally not required on nonporous surfaces such as glass, anodised aluminium, steel, and most painted metals. A test placement is always recommended for porous surfaces or where optimal adhesion is critical.
| Property | Value |
|---|---|
| Tack Free Time | 3 hours |
| Curing Time | 7–14 days at 25°C and 50% RH |
| Full Adhesion Time | 14–21 days |
| Flow Sag or Slump | 0.1 inch (2.54 mm) |
| Working Time | 20–30 minutes |
| VOC Content | 30 g/L |
| Durometer Hardness Shore A | 35 points (after 21 days) |
| Peel Strength | 32 lb/in (5.7 kg/cm) |
| Tension Adhesion Strength (25% Extension) | 45 psi (0.310 MPa) |
| Tension Adhesion Strength (50% Extension) | 60 psi (0.414 MPa) |
| Joint Movement Capability | ±50 percent |
| Staining (Granite, Marble, Limestone, Brick, Concrete) | None |
| Weatherability Temperature Range | -40°C to 149°C |
| Shelf Life | 12 months at or below 27°C |
| Minimum Durometer 7d/RT (SDS) | 25 Shore A |
| Minimum Tensile 7d/RT (SDS) | 125 psi |
| Minimum Elongation 7d/RT (SDS) | 450 % |
| Minimum Tear Die B 7d/RT (SDS) | 20 lb/in |
Here are some common examples on where Dowsil 795 used by our customers.
