Dow 799 Silicone Glass and Metal Building Sealant

Dow 799 Silicone Glass and Metal Building Sealant Datasheet
  • 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.

    *See Terms of Use Below

    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
  • Technical Data for Dow 799 Silicone Glass and Metal Building Sealant

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Paste - Toothpaste
    • Substrate
    • Chemistry
    • 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-001543A: 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-00230C: 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

    *See Terms of Use Below

    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.

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
25°C 50% RH at 25°C 77°F
Cure Time Test Methods
Cure Time Test Method
Fast
10,080 to 20,160 min 50% RH at 25°C 77°F
Tack Free Time Test Methods
Tack Free Time Test Method
15 min ASTM C 679, 50% RH
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature Test Method
230 psi 20,160 min 25°C ASTM D 412
Peel Strength Test Methods
Peel Strength Cure Time Cure Temperature Substrate Test Method
25 (pli) 20,160 min 25°C unprimed to aluminum and glass ASTM C 794
Elongation Test Methods
Elongation Test Method
4 % ASTM D 412, Ultimate, After 14 days at 25°C (77°F)
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method
30 ASTM D 2240