DOWSIL 791 is a one-part, neutral-curing, low-modulus silicone sealant for general glazing and weather sealing in curtain walls and building facades. Dow does not recommend it for structural glazing or insulated glazing.
Choose your DOWSIL 791 pack and colour
Dow neutral-cure silicone for facade weather sealing. Choose a format from Dow’s packaging range.
Ordering, pickup and delivery
Stock and ordering
Cranco carries DOWSIL 791. Call your Cranco counter with the product, pack and quantity to confirm availability and order timing.
Trade account
Cranco invoices trade accounts. Open an account at the counter, or complete the credit application first for your DOWSIL 791 orders. Call for the contractor price.
Delivery reach
Cranco’s trucks deliver DOWSIL 791 orders within a typical one to two hour drive of a counter. Call with the job address, products and quantities to confirm the route, date and delivery fee.
Pickup preparation
Cranco staff prepare called-in DOWSIL 791 orders for collection. Call your Cranco counter with the product, size, colour and quantity, then agree your pickup time before travelling.
Colours and sizes
Choose a 310 mL cartridge or 600 mL sausage and a colour from the DOWSIL 791 chart. Ask your Cranco counter to confirm the exact size, quantity and order timing; any colour in the manufacturer’s range can be ordered.
Older cartridge pictured; choose the ordering format below.DOWSIL 791, 310 mLCartridge. Choose the colour from the chart below.
Older cartridge pictured; choose the ordering format below.DOWSIL 791, 600 mLSausage. Match the applicator to the pack.
Open the full-size colour chartView the colours shown on the DOWSIL 791 chart
Choose a colour from the manufacturer’s range and ask your branch about your pack and quantity.
Black
Bronze
Camel
Gray
Limestone
Precast White
White
Movement capability ±50%. Apply at 5 to 40 °C. Minimum joint width: 6 mm. For 6 to 12 mm wide joints, Dow requires 6 mm sealant depth. Wider joints use a 2:1 width-to-depth ratio. For joints wider than 25 mm or deeper than 15 mm, contact Dow for technical assistance.
Where backing is needed, Dow recommends closed-cell polyethylene backer rod. Confirm the backing type when choosing a roll. Dow excludes structural glazing, insulated glazing and submerged joints.
DOWSIL 791 is Dow’s low-modulus silicone for facade weather sealing and movement joints. Dow packages it in 310 mL cartridges and 600 mL sausages. Choose your colour from the chart and call your counter for a quote.
DOWSIL 791 is a one-part, neutral-cure silicone sealant made by Dow for weather sealing curtain wall and building facades, and for expansion, connection, perimeter and movement joints. It is rated at 50% movement, it skins in 20 minutes and it is tack-free in 30 minutes.
FEATURES AND BENEFITS
Available in multiple colors and cures to form flexible and durable joints.
Highly resistant to weather, UV and temperature extremes.
Weatherproofs substrates such as glass, aluminum, steel, painted metal, EIFS, granite & other stone, concrete, brick, plastic.
Ready to use as supplied with all-temperature gunnability, easy tooling and low-odor curing.
Excellent unprimed adhesion to a wide variety of construction materials and building components, including anodized, alodined, most coated and many Kynar painted aluminums.
General glazing and weather sealing in curtain wall and building facades, and expansion, connection, perimeter and movement joints. Dow rates it at 50% movement and sets the application range at 5 to 40 °C.
How long does DOWSIL 791 take to dry?
It skins in 20 minutes and is tack-free in 30 minutes. Dow gives the cure in depth rather than in days: 2.0 mm at one day and 4.0 mm at three days, measured at 23 °C and 50% relative humidity.
How do you apply DOWSIL 791?
Dow sets the application range at 5 to 40 °C, and it ships in a 310 mL cartridge and a 600 mL sausage. Dow rules the sealant out on bituminous substrates, on natural rubber, chloroprene and EPDM, and on materials that bleed oils, plasticizers or solvents. On porous stone such as concrete, marble or granite Dow warns of bleeding and asks for a test on the actual substrate.
Is DOWSIL 791 waterproof?
It weather seals a facade joint, and Dow's sheet calls it resistant to ozone, ultraviolet radiation and temperature extremes. Dow rules it out for submerged joints and for joints where physical abuse or abrasion is likely, and says it is not for structural glazing or insulated glazing. Those three jobs take a different product.
Which standards does DOWSIL 791 carry?
Dow lists SNJF F&G-25E, ISO 11600-F&G-25LM, DIN 18540 Class F and the EN 15651 CE mark. Match the listed approvals to your project specification.
Where can you buy DOWSIL 791?
DOWSIL 791 is carried at Cranco’s three Ontario counters: Concord, 255 Spinnaker Way, Unit #2, Concord, ON L4K 4J1 (call 437.703.3003); Barrie, 556 Bryne Drive, Unit #1, Barrie, ON L4N 9P6 (call 289.379.7988); Mississauga, 1122 Lorimar Drive, Unit B, Mississauga, ON L5S 1R8 (call 647.797.8899). Call your counter with the product, pack, colour or size and quantity to confirm availability and arrange pickup.
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Limitations from Dow
Do not use DOWSIL™ 791 Silicone Weatherproofing Sealant on bituminous substrates, substrates based on natural rubber, choloroprene or EPDM or on building materials and flexible plastics which might bleed oils, plasticizers or solvents. Do not use DOWSIL™ 791 Silicone Weatherproofing Sealant in a totally confined space because the sealant requires atmospheric moisture to cure. DOWSIL™ 791 Silicone Weatherproofing Sealant is not recommended for use on submerged joints or in joints where physical abuse or abrasion is likely to occur. Bleeding can occur on porous substrates such as concrete, marble, granite or other natural stones. On sensitive substrates, specific testing should be carried out. This product is not suitable for areas where food contact is likely. DOWSIL™ 791 Silicone Weatherproofing Sealant is not recommended for structural glazing or insulated glazing applications. This product is neither tested nor represented as suitable for medical or pharmaceutical uses.
Branches
Call your chosen counter with the product, pack, colour and quantity for a quote.
