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Description for Dow 999-A Silicone Building & Glazing Sealant
Long life, wide service temperature range; resists sunlight, moisture and ultraviolet radiation.Chemical Resistance Sleet, Snow Application Type Seal 1 Part or 2 Part 1-Part Material Form Paste Substrate Glass, Metal, Plastic Manufacturer Dow Chemistry Silicone Cure Method Moisture Cure Temperature (°C) 25 Cure Time (min) 10,080 Ozone Resistance Ozone resistance High Temperature Resistance (°C) 177 Low Temperature Resistance (°C) -60 Other Resistance Sunlight Key Specifications ASTM (American Standard Test Method): C 920: Meets the qualifications of ASTM C 920 Specification, Class 25, FDA (U.S. Food & Drug Administration) and/or CFIA (Canadian Food Inspection Agency): Meets the qualifications of FDA 21 CFR 177.2600 (check colors for compliance) -
Technical Data for Dow 999-A Silicone Building & Glazing Sealant
Overview
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Chemical Resistance
- Chemical Resistance - Sleet, Snow
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Application Type
- Sealant - Seal
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1 Part or 2 Part
- 1-Part
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Material Form
- Paste
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Industry
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Chemistry
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Application Method
- Dispenser - Air-operated guns, Bulk dispensing equipment
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Cure Method
- Moisture / Condensation Cure - Moisture
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Key Specifications
- ASTM (American Standard Test Method) : C 920 : Class 25 - Meets the qualifications of ASTM C 920 Specification, Class 25
- FDA (U.S. Food & Drug Administration) and/or CFIA (Canadian Food Inspection Agency) : 177.2600 - Meets the qualifications of FDA 21 CFR 177.2600 (check colors for compliance)
Specifications
Cure Specs
Cure Temperature (°C) 25 Test Method Cure Time (min) 10,080 Test Method Tack Free Time (min) 10 to 20 Test Method Bond Strength
Peel Strength (piw) 20 (pli) Test Method Tear Strength (piw) 25 (ppi), 4.4 (kN/m) Test Method Tensile Strength (psi) 325 Test Method Material Resistance
Ozone Resistance Ozone resistance UV Resistance UV resistance Environmental Resistance Rain High Temperature Resistance (°C) 177 Low Temperature Resistance (°C) -60 Other Resistance Sunlight Hardness
Shore A Hardness 25 Test Method Not Good For
Don't Use For green or partially vulcanized rubber gaskets or tapes Don't Use With masonry, impregnated woodl, oil-based caulks -
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Best Practices for Dow 999-A Silicone Building & Glazing Sealant
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
---|---|
25°C | As Cured – 7 days at 25°C (77°F) and 50% RH |
Cure Time Test Methods
Cure Time | Test Method |
---|---|
10,080 min | As Cured – 7 days at 25°C (77°F) and 50% RH |
Tack Free Time Test Methods
Tack Free Time | Test Method |
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10 to 20 min | ASTM C 679 |
Peel Strength Test Methods
Peel Strength | Cure Time | Cure Temperature | Cure Humidity | Test Method |
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20 (pli) | 10,080 min | 25°C | 50 % | ASTM C 794 |
Tear Strength Test Methods
Tear Strength | Cure Time | Cure Temperature | Cure Humidity | Test Method |
---|---|---|---|---|
25 (ppi) | 10,080 min | 25°C | 50 % | ASTM D 624, As Cured – 7 days at 25°C (77°F) and 50% RH |
4.4 (kN/m) |
Tensile Strength Test Methods
Tensile Strength | Cure Time | Cure Temperature | Cure Humidity | Test Method |
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325 psi | 10,080 min | 25°C | 50 % | Ultimate, ASTM D 412 |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method | Hardness Temperature |
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25 | ASTM D 2240, 7 days at 25°C (77°F) and 50% RH | 25°C |

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