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Description for Dow 3-7509 Silicone Insulating Glass Sealant
Good unprimed adhesion to uncoated glass and aluminum; readily tooled; non-slump.Application Type Sealant 1 Part or 2 Part 1-Part Material Form Paste Substrate Aluminum, Uncoated glass Manufacturer Dow Chemistry Silicone Cure Method Moisture Cure Temperature (°C) 25 Cure Time (min) 480, 1,440, 10,080 Viscosity (cPs) Non-slump Color Black Key Specifications FDA (U.S. Food & Drug Administration) and/or CFIA (Canadian Food Inspection Agency): FDA Regulation 21 CFR 177.2600 -
Technical Data for Dow 3-7509 Silicone Insulating Glass Sealant
Overview
Specifications
Cure Specs
Cure Temperature (°C) 25 Test Method Cure Time (min) 480, 1,440, 10,080 Test Method Viscosity (cPs) Non-slump Tack Free Time (min) 10 Test Method Bond Strength
General Bond Strength (psi) Good adhesion Peel Strength (piw) 100 (%), 100 (%) Test Method Tensile Strength (psi) 300, 123 Test Method Hardness
Shore A Hardness 35 Test Method Elongation (%) 4 Test Method Flexibility Flexible Modulus (psi) High, 59 Test Method Other Properties
Specific Gravity 1.040 Test Method Business Information
Shelf Life Details Product should be stored at or below 27°C (80°F) in original, unopened containers. Shelf Life Temperature (°F) <81 Not Good For
Don't Use For oil-based caulks, green or partially vulcanized rubber gaskets, tapes Don't Use With impregnated wood, corrosion-sensitive coated glass -
Best Practices for Dow 3-7509 Silicone Insulating Glass Sealant
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Surface Preparation
Before using this product, clean all surfaces, removing all foreign matter and contaminants, such as grease, oil, dust, water, frost, surface dirt, old sealants or glazing compounds and protective coatings. Clean all surfaces by mechanical or solvent procedures. Always wipe solvents on and off with clean, oil- and lint-free cloths.
Follow solvent manufacturer’s recommended safe handling instructions and applicable federal, state and local laws.
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Testing
Dow Corning recommends several in-house quality control tests to ensure optimum sealant performance. These tests include: Cure test to ensure expected sealant cure rate.
Tab adhesion tests to ensure proper sealant adhesion to production surfaces.
These tests should be performed every time sealant batches are changed. Specific procedures for these recommended tests can be supplied by Dow Corning.
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
---|---|
25°C | 50 percent Relative Humidity |
Cure Time Test Methods
Cure Time | Test Method |
---|---|
480 min | CTM 0663, Deep section cure, 0.070 inches |
1,440 min | CTM 0663, Deep section cure, 0.112 inches |
10,080 min | 50 percent Relative Humidity |
Tack Free Time Test Methods
Tack Free Time | Test Method |
---|---|
10 min | ASTM D 2377 |
Peel Strength Test Methods
Peel Strength | Cure Time | Cure Temperature | Cure Humidity | Substrate | Test Method |
---|---|---|---|---|---|
100 (%) | 10,080 min | 25°C | 50 % | Glass | ASTM C 794, 100 percent, Cohesive failure |
100 (%) | 10,080 min | 25°C | 50 % | Aluminum | ASTM C 794, 100 percent, Cohesive failure |
Tensile Strength Test Methods
Tensile Strength | Cure Time | Cure Temperature | Cure Humidity | Substrate | Test Method |
---|---|---|---|---|---|
300 psi | 10,080 min | 25°C | 50 % | ASTM D 412 | |
123 psi | 10,080 min | 25°C | 50 % | Glass | 100 percent cohesive failure, 1/2" x 1/2" x 2" (13 x 13 x 51-mm) joint |
Elongation Test Methods
Elongation | Test Method |
---|---|
4 % | ASTM D 412, 7 Days at 25°C (77°F) and 50 percent Relative Humidity |
Modulus Test Methods
Modulus | Temperature | Test Method |
---|---|---|
High | ||
59 psi | 25°C | 25% Modulus, 7 Days at 25°C (77°F) and 50 percent Relative Humidity |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method | Hardness Temperature |
---|---|---|
35 | ASTM D 2240, 7 Days at 25°C (77°F) and 50 percent Relative Humidity | 25°C |
Specific Gravity Test Methods
Specific Gravity | Test Method |
---|---|
1.040 | CTM 0044 |

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