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Description for Dow 995 Silicone Structural Glazing Sealant
Excellent weatherability and high resistance to ultraviolet radiation, heat and humidity, ozone and temperature extremes; excellent mechanical properties and unprimed adhesion.Application Type Bond, Seal 1 Part or 2 Part 1-Part Material Form Paste, Silicone elastomer Substrate Painted aluminum, Coated glass, Anodized, Polyester coated, Enameled glass, Metal, Glass, Reflective glass Manufacturer Dow Chemistry Silicone elastomer Cure Method Moisture Cure Temperature (°C) 25 Cure Time (min) 10,080 to 20,160, 20,160 to 30,240 Viscosity (cPs) Sag, Slump Color Black, Gray, White Ozone Resistance Ozone resistance Durability Tough Elastomeric Elastomeric Key Specifications ASTM (American Standard Test Method): C 920: ASTM Specification C-920 Type S, Grade NS, Class 50, Use NT, G and A; ASTM C1184, ASTM (American Standard Test Method): ASTM Specification C-920 Type S, Grade NS, Class 50, Use NT, G and A; ASTM C1184, TT (U.S. Federal Specification): S-001543A: TT-S-001543A (COM-NBS) Class A; TT-S-00230C (COM-NBS) Class A, TT (U.S. Federal Specification): S-00230C: TT-S-001543A (COM-NBS) Class A; TT-S-00230C (COM-NBS) Class A -
Technical Data for Dow 995 Silicone Structural Glazing Sealant
Overview
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1 Part or 2 Part
- 1-Part
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Material Form
- Elastomer - Silicone elastomer
- Paste
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Chemistry
- Silicone - Silicone elastomer
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Application Method
- Dispenser - Many types of air-operated guns, Most types of bulk dispensing equipment
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Cure Method
- Moisture / Condensation Cure - Moisture
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Color
- Black
- Gray
- White
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Key Specifications
- ASTM (American Standard Test Method) : C 920 : Class 50 - ASTM Specification C-920 Type S, Grade NS, Class 50, Use NT, G and A; ASTM C1184
- ASTM (American Standard Test Method) : C1184 - ASTM Specification C-920 Type S, Grade NS, Class 50, Use NT, G and A; ASTM C1184
- TT (U.S. Federal Specification) : S-001543A : Class A - TT-S-001543A (COM-NBS) Class A; TT-S-00230C (COM-NBS) Class A
- TT (U.S. Federal Specification) : S-00230C : Class A - TT-S-001543A (COM-NBS) Class A; TT-S-00230C (COM-NBS) Class A
Specifications
Cure Specs
Cure Temperature (°C) 25 Test Method Cure Time (min) 10,080 to 20,160, 20,160 to 30,240 Test Method Viscosity (cPs) Sag, Slump Tack Free Time (min) 65 Test Method Work / Pot Time (min) 10 to 20 Bond Strength
Peel Strength (piw) 40 (ppi) Test Method Tear Strength (piw) 49 (ppi) Test Method Tensile Strength (psi) High, 350 Test Method Material Resistance
Ozone Resistance Ozone resistance UV Resistance High Moisture/Humidity Resistance High Hardness
Durability Tough Shore A Hardness 40 Test Method Elastomeric Elastomeric Elongation (%) 5 Test Method Flexibility Flexible Other Properties
Specific Gravity 1.339 Business Information
Shelf Life Details When stored at or below 30ºC (86ºF) in the original unopened containers, this product has a usable life of 18 months from the date of manufacture. Shelf Life Type From date of manufacture Shelf Life (mon) 18 Not Good For
Don't Use With Building materialsthat bleed oils, Plasticizers, Solvents –materials such as impregnated wood, oil-based caulks, Green or partially vulcanized rubber gaskets or tapes -
Best Practices for Dow 995 Silicone Structural Glazing Sealant
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Surface Preparation
Clean all joints and glazing pockets, 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 back-up 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 995 Silicone Structural Glazing Sealant in a continuous operation using a 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 10 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 | 25ºC 77ºF at 50% RH, MIL-S-8802 |
Cure Time Test Methods
Cure Time | Test Method |
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10,080 to 20,160 min | 25ºC 77ºF at 50% RH, MIL-S-8802 |
20,160 to 30,240 min | Full Adhesion, MIL-S-8802 |
Tack Free Time Test Methods
Tack Free Time | Test Method |
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65 min | MIL-S-8802, 50% RH |
Peel Strength Test Methods
Peel Strength | Cure Time | Cure Temperature | Cure Humidity | Test Method |
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40 (ppi) | 10,080 min | 25°C | 50 % | ASTM C0794 |
Tear Strength Test Methods
Tear Strength | Cure Time | Cure Temperature | Cure Humidity | Test Method |
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49 (ppi) | 10,080 min | 25°C | 50 % | ASTM D0624, Die B |
Tensile Strength Test Methods
Tensile Strength | Cure Time | Cure Temperature | Cure Humidity | Test Method |
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High | ||||
350 psi | 10,080 min | 25°C | 50 % | ASTM D0412 |
Elongation Test Methods
Elongation | Test Method |
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5 % | After 7 days at 25ºC (77ºF), 50% RH, Ultimate Elongation |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method | Hardness Temperature |
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40 | ASTM D2240, After 7 days at 25ºC (77ºF), 50% RH | 25°C |

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