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Description for Dow 795 Silicone Building Sealant
Excellent weatherability; resistant to temperature extremes; excellent unprimed adhesion to a wide variety of construction materials; all temperature gunnability.Application Type Bond, Seal 1 Part or 2 Part 1-Part Material Form Paste Substrate Coated aluminums, Glass, Anodized, Plastics, Steel, Alodined, Concrete, Porous, Non-porous, Painted aluminums, Painted metal, EIFS, Granite Manufacturer Dow Chemistry Silicone Cure Method Moisture Cure Temperature (°C) 25, 25 Cure Time (min) 10,080 to 20,160, 30,240 Viscosity (cPs) Non-sag, Slump Color Black, Blue spruce, Adobe tan, Stone, Limestone, Adobe tan, Adobe tan, White, Bronze, Gray: Aluminum, Charcoal, Blue spruce, Gray, Sandstone, Brick, Sandstone, Rustic brick, Limestone, Dusty rose, Rustic brick High Temperature Resistance (°C) 149 Low Temperature Resistance (°C) -40 Key Specifications ASTM (American Standard Test Method): C 920: ASTM Specification C 1184; ASTM Specification C 920 Type S, Grade NS, Class 50, Use NT, G, A and O, ASTM (American Standard Test Method): ASTM Specification C 1184; ASTM Specification C 920 Type S, Grade NS, Class 50, Use NT, G, A and O, CAN/CGSB (Canadian General Standards Board): Canadian Specification CAN2-19.13-M82, TT (U.S. Federal Specification): S-00230C: Federal Specification TT-S-001543A(COM-NBS) Class A; Federal Specification TT-S-00230C (COM-NBS) Class A, TT (U.S. Federal Specification): S-001543A: Federal Specification TT-S-001543A(COM-NBS) Class A; Federal Specification TT-S-00230C (COM-NBS) Class A -
Technical Data for Dow 795 Silicone Building Sealant
Overview
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1 Part or 2 Part
- 1-Part
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Material Form
- Paste
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Industry
- Industrial - Panel stiffener
- Construction
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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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Color
- Black - Charcoal
- Blue - Blue spruce
- Brown - Adobe tan, Blue spruce, Rustic brick
- Gray - Limestone, Stone
- Gray : Aluminum
- Off-White - Limestone, Sandstone
- Orange - Adobe tan
- Red - Adobe tan, Brick, Dusty rose, Rustic brick
- White
- Yellow - Bronze, Sandstone
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Key Specifications
- ASTM (American Standard Test Method) : C 920 : Class 50 - ASTM Specification C 1184; ASTM Specification C 920 Type S, Grade NS, Class 50, Use NT, G, A and O
- ASTM (American Standard Test Method) : C 1184 - ASTM Specification C 1184; ASTM Specification C 920 Type S, Grade NS, Class 50, Use NT, G, A and O
- CAN/CGSB (Canadian General Standards Board) : 19.13 - Canadian Specification CAN2-19.13-M82
- TT (U.S. Federal Specification) : S-00230C : Class A - Federal Specification TT-S-001543A(COM-NBS) Class A; Federal Specification TT-S-00230C (COM-NBS) Class A
- TT (U.S. Federal Specification) : S-001543A : Class A - Federal Specification TT-S-001543A(COM-NBS) Class A; Federal Specification TT-S-00230C (COM-NBS) Class A
Specifications
Cure Specs
Cure Temperature (°C) 25, 25 Test Method Cure Time (min) 10,080 to 20,160, 30,240 Test Method Viscosity (cPs) Non-sag, Slump Tack Free Time (min) 180 Test Method Work / Pot Time (min) 20 to 30 Bond Strength
Peel Strength (piw) 32 (lb/in) Test Method Tensile Strength (psi) 45, 60, 35, 50 Test Method Material Resistance
High Temperature Resistance (°C) 149 Low Temperature Resistance (°C) -40 Hardness
Shore A Hardness 35 Test Method Flexibility Flexible Modulus (psi) Medium Business Information
Shelf Life Details When stored at or below 27°C (80°F), Dow Corning 795 Silicone Building Sealant has a shelf life of 12 months from the date of manufacture. Refer to product packaging for “Use By Date.” Shelf Life Type From date of manufacture Shelf Life (mon) 12 Not Good For
Don't Use With surfaces that are continuously immersed in water -
Best Practices for Dow 795 Silicone Building Sealant
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Surface 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.
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Application
Install backing material or joint filler, setting blocks, spacer shims and tapes. Mask areas adjacent to joints to ensure neat sealant lines. Primer is generally not required on non-porous surfaces, but may be necessary for optimal sealing of certain porous surfaces. A test placement is always recommended. Apply Dow Corning 795 Silicone Building Sealant in a continuous operation using positive pressure. (The sealant can be applied using many types of air-operated guns and most types of bulk dispensing equipment.) Before a skin forms (typically within 15 minutes), tool the sealant with light pressure to spread the sealant against the backing material and joint surfaces. Remove masking tape as soon as the bead is tooled.
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
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25°C | 25°C 77°F and 50% RH |
25°C | As Cured – After 21 days at 25°C (77°F) and 50% RH |
Cure Time Test Methods
Cure Time | Test Method |
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10,080 to 20,160 min | 25°C 77°F and 50% RH |
30,240 min | As Cured – After 21 days at 25°C (77°F) and 50% RH |
Tack Free Time Test Methods
Tack Free Time | Test Method |
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180 min | ASTM C 679, 50% RH |
Peel Strength Test Methods
Peel Strength | Cure Time | Cure Temperature | Cure Humidity | Test Method |
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32 (lb/in) | 30,240 min | 25°C | 50 (%) RH | ASTM C 794, As Cured – After 21 days at 25°C (77°F) and 50% RH |
Tensile Strength Test Methods
Tensile Strength | Cure Time | Cure Temperature | Cure Humidity | Test Method |
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45 psi | 30,240 min | 25°C | 50 (%) RH | ASTM C 1135, at 25% Extension |
60 psi | 30,240 min | 25°C | 50 (%) RH | ASTM C 1135, at 50% Extension |
35 psi | 30,240 min | 25°C | 50 (%) RH | ASTM C 1135, As Cured – After 21 days at 25°C (77°F) and 50% RH followed by 10,000 hours in a QUV weatherometer, ASTM G 53 |
50 psi | 30,240 min | 25°C | 50 (%) RH | ASTM C 1135, As Cured – After 21 days at 25°C (77°F) and 50% RH followed by 10,000 hours in a QUV weatherometer, ASTM G 53 |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method | Hardness Temperature |
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35 | ASTM D 2240, After 21 days at 25°C (77°F) and 50% RH | 25°C |