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-001543A: Federal Specification TT-S-001543A (COM-NBS) Class A; Federal Specification TT-S-00230C (COM-NBS) Class 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

Best Practices for Dow 799 Silicone Glass and Metal Building 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. 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.
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.

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Technical Data

Overview

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Specifications

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Best Practices

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Comparable Materials

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