Features 1. Ideal for expansion, connection, perimeter and other movement joints 2.Neutral cure - suitable for use on coated glass, galvanized steel, masonry and other porous and non-porous substrates 3.Extension/compression movement capability of up to ±50 percent of the original joint width 4.Excellent weatherability, virtually unaffected by sunlight, rain, snow, ozone 5.Excellent unprimed adhesion to a wide variety of construction materials and building components 6.Ease of application - ready to use as supplied 7.Excellent rheology, low string upon gunning |
Application Dow Corning ® 791 Silicone Weatherproofing Sealant is a specified, premium performance weather sealing product specifically designed for general glazing and weather sealing in curtain wall and building facades. |
Parameter
Test | Property | Unit | Result |
Uncured - As Tested at 50% RH and 23°C (73°F) | |||
ASTM C639 | Flow (sag or slump) | inches (mm) | 0 |
ASTM C1183 | Extrusion Rate | g/minute | 210 |
ASTM C679 | Working Time | minutes | 20 |
Tack-free Time, 77°F, 50% RH | minutes | 45 | |
Curing Time at 77°F (25°C ) and 50% RH | days | 7-14 | |
77°F (25°C) and 50% RH days 7-14 VOC Content 2 |
g/L | 45 | |
Application Temperature | °C | 4-40 | |
Specific Gravity | - | 1.51 | |
As Cured - After 21 days at 50% RH and 25°C (77°F) | |||
ASTM C661 | Hardness, Shore A | points | 25-30 |
ASTM C794 | Peel Strength |
lb/in (kg/cm) |
30 (5.4) |
ASTM D624 | Tear Strength Die B | KN/m | 9.0 |
ASTM C719 | Joint Movement Capability | % | ±50 |
Service Temperature | °C | -50-150 | |
ASTM C1135 | Tensile Adhesion Strength | ||
At 100% extension |
Psi (M Pa) |
58 (0.40) |
|
At 100% extension | % | 430 | |
Ultimate Tensile Strength |
Psi (M Pa) |
120 (0.83) |
DESIGN OF WEATHERPROOF JOINT
Proper joint design can reduce the stress on the sealant and help obtain optimal sealant movement capability,
improve the ease of application, reduce cohesive failure, and minimize the effects of curing byproducts.
Design guidelines:
1. Minimum joint width: 6mm.
2. Minimum joint depth: 6mm.
3. For larger joints, the width of the joint shall be larger than the depth of sealant. (See Figure 1, and refer
to guidelines 1 and 2 above.)
4. To avoid 3-sided adhesion, backer rod or non-adhesion tape should be used at the bottom of the joint to ensure that the sealant is only adhering to the edge of the joint and to ensure flexible movement in the joint.
HOW TO USE
Joint Preparation
Clean all joints removing all foreign matter and contaminants such as grease, oil, dust, water, frost, surface
dirt, old sealants or glazing compounds and protective coatings.
Authorization
FAQ
What confused you about silicone sealant purchasing?
1. Free Samples?
Free sample, but the customer need to bear the freight.
2. MOQ?
The MOQ is 50 cartons,20 sausages/carton.
3. Delivery Time?
Within 15 days after the receipt of deposit and confirmed designs.
4. Payment Terms.
30%T/T deposit and 70% balance or L/C at sight.