Dow 799 Silicone Glass and Metal Building Sealant

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Description for Dow 799 Silicone Glass and Metal Building Sealant

Excellent weatherability; noncorrosive; adheres to many materials without the use of primer; all temperature gunnability.

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Application Type	Seal
1 Part or 2 Part	1-Part
Material Form	Toothpaste
Substrate	Glass, Metal
Manufacturer	Dow
Chemistry	Silicone
Cure Method	Moisture
Cure Temperature (°C)	25
Cure Time (min)	Fast, 10,080 to 20,160
Viscosity (cPs)	Toothpaste
High Temperature Resistance (°C)	177
Low Temperature Resistance (°C)	-62
Key Specifications	ASTM (American Standard Test Method): C 920: ASTM Specification C-920 Type S, Grade NS, Class 25, Use T, NT, M, G, A, 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

Best Practices for Dow 799 Silicone Glass and Metal Building Sealant

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Technical Data for Dow 799 Silicone Glass and Metal Building Sealant

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Overview

Application Type
- Sealant - Seal
1 Part or 2 Part
- 1-Part
Material Form
- Paste - Toothpaste
Substrate
- Glass
- Metal
Chemistry
- Silicone
Application Method
- Dispenser - Air-operated guns, Bulk dispensing equipment
Cure Method
- Moisture / Condensation Cure - Moisture
Key Specifications
- ASTM (American Standard Test Method) : C 920 : Class 25 - ASTM Specification C-920 Type S, Grade NS, Class 25, Use T, NT, M, G, A
- 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	Test Method
Cure Time (min)	Fast, 10,080 to 20,160	Test Method
Viscosity (cPs)	Toothpaste
Tack Free Time (min)	15	Test Method
Work / Pot Time (min)	5.00 to 10

Bond Strength

Peel Strength (piw)	25 (pli)	Test Method
Tensile Strength (psi)	230	Test Method

Material Resistance

High Temperature Resistance (°C)	177
Low Temperature Resistance (°C)	-62

Hardness

Shore A Hardness	30	Test Method
Elongation (%)	4	Test Method
Flexibility	Flexible

Business Information

Shelf Life Details	When stored in original, unopened containers at or below 32°C (90°F), Dow Corning 799 Silicone Glass and Metal Building Sealant has a shelf life of 12 months from date of manufacture. Refer to product packaging for “Use By” date. For best storage results, keep Dow Corning 799 Silicone Glass and Metal Building Sealant in tightly closed containers when not in use.
Shelf Life Type	From date of manufacture
Shelf Life (mon)	12

Not Good For

Don't Use For	structural silicone glazing applications
Don't Use With	substrates that bleed oil or plasticizers, wet or frost-laden surfaces

Best Practices for Dow 799 Silicone Glass and Metal Building 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. Metal, glass and plastic surfaces should be cleaned by mechanical or solvent procedures. Detergent or soap and water treatment are not acceptable. In all cases where used, solvents should be wiped on and off with clean, oil- and lint-free cloths.
2. Application
  
  Install back-up material or joint filler, setting blocks, spacer shims and tapes as specified. Apply Dow Corning 799 Silicone Glass and Metal Building Sealant in a continuous operation using a positive pressure adequate to properly fill and seal the joint. Tool or strike Dow Corning 799 Silicone Glass and Metal Building Sealant with light pressure to spread the material against the back-up material and the joint surfaces. A tool with a concave profile is recommended to keep the sealant within the joint. When glazing, tool the sealant applied at the sill so that precipitation and cleaning solutions will not pool. Dow Corning 799 Silicone Glass and Metal Building Sealant can be applied at outdoor temperatures as low as -37°C (-35°F) provided that surfaces are clean, dry and frost-free. Excess sealant should be cleaned from glass, metal and plastic surfaces while still uncured using a commercial solvent such as xylol, toluol or methyl ethyl ketone.1 Should the sealant accidentally contact adjacent porous surfaces, the excess sealant should be allowed to progress through the initial cure or set-up. It should then be removed by abrasion or other mechanical means.
Comparable Materials for Dow 799 Silicone Glass and Metal Building Sealant

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Spec Engine^® Results
- 737 Neutral Cure Sealant(Dow)
  One-part, RTV silicone sealant, low odor, neutral cure, will not corrode substrates, good adhesion, cures quickly to a tough rubbery solid.
- 732 Multi-Purpose Sealant(Dow)
  One-part; non-slumping RTV paste, good resistance to weathering, moisture and temperature extremes; cures to a tough rubbery solid.
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