Dow 995 Silicone Structural Glazing Sealant

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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.

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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): ASTM Specification C-920 Type S, Grade NS, Class 50, Use NT, G and A; ASTM C1184, ASTM (American Standard Test Method): C 920: 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

Best Practices for Dow 995 Silicone Structural Glazing Sealant

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Technical Data for Dow 995 Silicone Structural Glazing Sealant

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Overview

Application Type
- Adhesive - Bond
- Sealant - Seal
1 Part or 2 Part
- 1-Part
Material Form
- Elastomer - Silicone elastomer
- Paste
Substrate
- Glass - Coated glass, Enameled glass, Reflective glass
- Metal - Anodized
- Aluminum - Painted aluminum
- Polyester - Polyester coated
Chemistry
- Silicone - Silicone elastomer
Application Method
- Dispenser - Many types of air-operated guns, Most types of bulk dispensing equipment
Cure Method
- Moisture / Condensation Cure - Moisture
Color
- Black
- Gray
- White
Key Specifications
- ASTM (American Standard Test Method) : C1184 - ASTM Specification C-920 Type S, Grade NS, Class 50, Use NT, G and A; ASTM C1184
- 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
- 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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1. 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.
2. 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.
Comparable Materials for Dow 995 Silicone Structural Glazing Sealant

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Spec Engine^® Results
- 839 Silicone Adhesive/Sealant(Dow)
  Silicone adhesive sealant one-part, translucent blue, moisture cure adhesives are generally cured at room temperature, non-flowing, automated or manual needle dispensing systems.
- Dowsil 838 Silicone Adhesive Sealant(Dow)
  A one-part, white, non-flowing general purpose adhesive with good flame resistance, room temperature cure, high elongation.
- 3165 Fast Tack RTV Adhesive/Sealant(Dow)
  Fast tack-free time; noncorrosive; good green strength; good room-temperature adhesion to most substrates; non-flow.
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