Dow 790 Silicone Building Sealant

Dow 790 Silicone Building Sealant Datasheet
  • Description for Dow 790 Silicone Building Sealant

    Excellent performance in building joints that experience extreme movement; excellent weathering properties and unprimed adhesion.

    *See Terms of Use Below

    Application Type Bond, Seal
    1 Part or 2 Part 1 Part
    Material Form Toothpaste
    Substrate Aluminum coated with fluoropolymer-based paint, Anodized aluminum, Ceramics, Non-porous, Porous, Glass, Carbon, Plastics, Siliconized polyester paint, Steel, EIFS base and top coat, Wood, Concrete, Mill-finished aluminum, Stainless, Glazed surfaces, Granite, Grout, Mortar, Tile
    Industry Exterior Insulation and Finish Systems (EIFS) joints
    Manufacturer Dow
    Chemistry Silicone
    Cure Method Moisture
    Cure Temperature (°C) 25
    Cure Time (min) 10,080 to 20,160
    Viscosity (cPs) Toothpaste
    Color Black, Blue spruce, Adobe tan, Gray: Aluminum, Stone, Adobe tan, Limestone, Adobe tan, Precast white, Bronze, Charcoal, Blue spruce, Limestone, Natural stone, Sandstone, Brick, Sandstone, Rustic brick, Gray, Dusty rose, Rustic brick
    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 and O, CAN/CGSB (Canadian General Standards Board): CAN2-19.13-M82, TT (U.S. Federal Specification): Federal Specification TT-S-001543A, TT (U.S. Federal Specification): Federal Specification TT-S-00230C, UL 263
  • Technical Data for Dow 790 Silicone Building Sealant

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Paste - Toothpaste
    • Substrate
      • Ceramic - Ceramics
      • Non-Porous Substrates - Non-porous
      • Porous Substrates - Porous
      • Concrete
      • Glass
      • Metal - Carbon, Stainless
      • Aluminum - Aluminum coated with fluoropolymer-based paint, Mill-finished aluminum
      • Steel
      • Plastic - Plastics
      • Wood
      • Anodized Aluminum
      • Polyester - Siliconized polyester paint
      • Stone - EIFS base and top coat, Glazed surfaces, Granite, Grout, Mortar, Tile
      • Other - Masonry
    • Industry
      • Industrial - Curtainwall joints, Expansion and control joints, Mullion joints, Precast concrete panel joints, Stone pavers
      • Industrial Exterior - Exterior Insulation and Finish Systems (EIFS) joints
      • Construction - Construction joints
    • Chemistry
    • Application Method
      • Dispenser - Air-operated guns, Bulk dispensing equipment
    • Cure Method
      • Moisture / Condensation Cure - Moisture
    • Color
      • Black - Charcoal
      • Blue - Blue spruce
      • Brown - Adobe tan, Blue spruce, Rustic brick
      • Gray - Limestone, Stone
      • Gray: Aluminum
      • Off-White - Limestone, Sandstone
      • Red - Adobe tan, Brick, Dusty rose, Rustic brick
      • White - Precast white
      • Yellow - Bronze, Sandstone
      • Other - Natural stone, Adobe tan
    • Key Specifications
      • UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) - UL 263
      • 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 and O
      • CAN/CGSB (Canadian General Standards Board): 19.13 - CAN2-19.13-M82
      • TT (U.S. Federal Specification): S-001543A - Federal Specification TT-S-001543A
      • TT (U.S. Federal Specification): S-00230C - Federal Specification TT-S-00230C
    Specifications
    Cure Specs
    Cure Temperature (°C) 25 Test Method
    Cure Time (min) 10,080 to 20,160 Test Method
    Viscosity (cPs) Toothpaste
    Tack Free Time (min) 60 Test Method
    Work / Pot Time (min) 10 to 20
    Bond Strength
    Peel Strength (piw) 25 (lb/in) Test Method
    Tensile Strength (psi) 100, 15, 20 Test Method
    Material Resistance
    Environmental Resistance Excellent weathering
    Hardness
    Shore A Hardness 15 Test Method
    Elongation (%) High, 1,600 Test Method
    Flexibility Flexible
    Modulus (psi) Ultra-low
    Business Information
    Shelf Life Details When stored at or below 32°C (90°F), Dow Corning 790 Silicone Building Sealant has a usable life of 12 months from date of manufacture. Refer to product packaging for “Use By” date.
    Shelf Life Type From date of manufacture
    Shelf Life (mon) 12
    Not Good For
    Don't Use For surfaces that are continuously immersed in water., green or partially vulcanized rubber gaskets or tapes or bituminous belowgrade waterproofing and asphaltimpregnated fiberboard.
    Don't Use With brass, impregnated wood, oil-based caulks
  • Best Practices for Dow 790 Silicone Building Sealant

    *See Terms of Use Below

    1. Surface Preparation

      Clean all concrete, masonry and stone joints of all contaminants and impurities. Concrete form release agents, water repellents, laitance, surface dirt and rust, all old sealants and other surface treatments and protective coatings are examples of materials that must be removed from the joint surfaces to obtain proper sealant adhesion. Porous substrates should be cleaned where necessary by grinding, saw cutting, blast cleaning (sand or water), mechanical abrading or a combination of these methods as required to provide a sound, clean, dry surface for sealant application.1 Dust, loose particles, etc., should be blown out of joints with oil-free compressed air or be vacuum cleaned. Metal and glass surfaces adjacent to masonry should be cleaned by wiping with an oil-free absorbent cloth saturated with solvent such as xylene or toluene. Do not use alcohols as they inhibit the cure. Follow the solvent manufacturer’s safe handling recommendations and local, state and federal regulations regarding solvent usage.

      See Vendor Technical Data Sheet for more info.

    2. Application

      Dow Corning 790 Silicone Building Sealant should be applied in a continuous operation. A positive pressure adequate to properly fill and seal the joint width should be employed. Tool or strike Dow Corning 790 Silicone Building Sealant with light pressure to spread the material against the back-up material and the joint surfaces. Do not use soaps, oil or alcohols as tooling aids as they inhibit the cure. Use a tool with a concave profile to keep Dow Corning 790 Silicone Building Sealant within the joint. The sealant can be applied at outdoor temperatures as low as -29°C (-20°F), provided that surfaces are clean, dry and frost-free. As a general rule, condensation or frost should not be a problem above 4.4°C (40°F). It is imperative that uncured silicone sealants are not allowed to contact nonabradable surfaces such as polished granites, metal or glass. Because excess silicone sealant cannot be completely removed with organic or chlorinated solvents, these surfaces must be masked or extreme care taken to prevent any silicone sealant from contacting them during sealant application. Once an uncured sealant contacts the surface, it will leave a film that may change the aesthetic surface characteristics of that substrate. In cases where excess uncured sealant is inadvertently applied to adjacent surfaces, the sealant should be cleaned from nonporous surfaces before curing, using a commercial solvent such as xylene. Follow the solvent manufacturer’s safe handling recommendations and local, state and federal regulations regarding solvent usage.

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
25°C 50% RH
Cure Time Test Methods
Cure Time Test Method
10,080 to 20,160 min 50% RH
Tack Free Time Test Methods
Tack Free Time Test Method
60 min ASTM C 679, 50% RH
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature Cure Humidity Test Method
100 psi 10,080 min 25°C 50 % ASTM D 412, Ultimate tensile strength, maximum elongation
15 psi 10,080 min 25°C 50 % ASTM C 1135, at 25% extension
20 psi 10,080 min 25°C 50 % ASTM C 1135, at 50% extension
Peel Strength Test Methods
Peel Strength Cure Time Cure Temperature Cure Humidity Test Method
25 (lb/in) 10,080 min 25°C 50 % ASTM C 794
Elongation Test Methods
Elongation Test Method
High Elongation Test Method
1,600 % ASTM D 412, After 7 days at 25°C (77°F) and 50% RH
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
15 ASTM C 661, After 7 days at 25°C (77°F) and 50% RH 25°C