Dowsil 791 Weatherproofing Sealant
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Price Per Unit: $14.08
Price Per Box: $12.67
Dowsil™ 791 is a versatile silicone sealant perfect for weatherproofing and glazing in construction. It offers exceptional resistance to harsh weather conditions and UV rays, ensuring a durable, long-lasting seal for various joint types.
- $14.08
- $14.08
- Unit price
- per
Prices do not include GST
Physical Properties
Cure system:
Alkoxy
Application temperature:
+5 to +40 °c
Specific gravity:
1.50
Extrusion rate:
220 g/minute
Skin-over time (23°c, 50% r.h.):
20 minutes
Tack-free time (23°c, 50% r.h.):
30 minutes
Cure rate (23°c, 50% r.h.) 1 day:
2.0 mm
Cure rate (23°c, 50% r.h.) 3 days:
4.0 mm
Modulus 100% (2 mm thickness s2 dumb-bells):
0.45 mpa
Tensile strength (2 mm thickness s2 dumb-bells):
1.9 mpa
Elongation at break (2 mm thickness s2 dumb-bells):
700%
Modulus 100% (12x12x50 mm size t.a. joint):
0.35 mpa
Tensile strength (12x12x50 mm size t.a. joint):
0.75 mpa
Elongation at break (12x12x50 mm size t.a. joint):
380%
Hardness (shore a):
29
Elastic recovery:
> 90%
Packaging information:
310 ml cartridges and 600 ml sausages
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Shipping & Delivery
$15.95 + GST for Australia-wide shipping, excluding DG, oversized, long-length, and bagged items over 15kg. Remote areas and site deliveries are also ineligible. If your order includes any of these, we’ll contact you to arrange additional freight fees. Online purchases only.
Dowsil™ 791 Silicone Weatherproofing Sealant is a one-part, neutral-curing, low-modulus silicone sealant, ideal for a wide range of weather sealing applications. Engineered for durability and performance, this sealant provides excellent resistance to UV radiation, ozone, and extreme temperatures, ensuring long-lasting protection against the elements. Its low-modulus formulation allows for ±50% joint movement, making it suitable for dynamic joints in both commercial and residential projects.
Key Features:
- Neutral cure system
- Low odour
- Excellent resistance to UV radiation, ozone and temperature extremes
- Joint movement capability ± 50%
Certifications:
- Conforms to SNJF (F&G - 25E)
- ISO 11600-F&G-25LM
- DIN 18540 Class F
- EN 15651 - CE MARK
- EMICODE EC1 Plus
- Blue Angel (DE-UZ 123)
Uses:
- General glazing
- Weather sealing
- Curtain wall sealing
- Building facade sealing
- Expansion joints
- Connection joints
- Perimeter joints
- Movement joints
Benefits:
- Long-lasting weather protection
- Durable and flexible seal
- Resists UV radiation, ozone and temperature extremes
- Accommodates joint movement (± 50%)
- Easy to apply and tool
- Low odour
- Neutral cure
Application Guide:
- Prepare surfaces by cleaning and drying thoroughly.
- Mask adjacent areas to prevent contamination.
- Apply sealant to the joint, ensuring full contact with substrates.
- Tool the sealant within 5 minutes of application for a smooth finish.
- Remove masking tape immediately after tooling.
Limitations:
- Not suitable for use on bituminous substrates, natural rubber, chloroprene, or EPDM.
- Not recommended for submerged joints or areas with high abrasion.
- Not recommended for structural glazing or insulated glazing applications.
- Bleeding may occur on porous substrates like concrete or stone.
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