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Description for Dow Contractors Weatherproofing Sealant
Primerless on most common nonporous building substrates; easy gunnability in all weather conditions.Application Type Bond, Seal 1 Part or 2 Part 1-Part Material Form Paste Substrate Painted aluminum, EIFS, Concrete, Porous, Nonporous, Precast Industry Windows, Doors Manufacturer Dow Chemistry Silicone Cure Method Moisture Application Temperature (°F) -20 to 120 Cure Temperature (°C) 25, 25 Cure Time (min) 180 to 360, 10,080 to 20,160 Color 11 standard stocked colors, Gray: Aluminum High Temperature Resistance (°C) 121 Low Temperature Resistance (°C) -40 Key Specifications ASTM (American Standard Test Method): C 920: ASTM C 920, Type S, Grade NS, Class 25, Use NT, M, A and O (granite), TT (U.S. Federal Specification): TT-S-01543A; TT-S-00230C, Type II, Class A ±25% movement capability, TT (U.S. Federal Specification): S-00230C: TT-S-01543A; TT-S-00230C, Type II, Class A ±25% movement capability -
Technical Data for Dow Contractors Weatherproofing Sealant
Overview
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1 Part or 2 Part
- 1-Part
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Material Form
- Paste
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Industry
- Industrial - Concrete panel joints, Curtainwall joints, Expansion and control joints, Tilt-up panel joints
- Construction - Perimeter caulking, Masonry, Bedding of frames, Bedding of panels, Bedding of mullions, panels and frames), Radon mitigation, EIFS, Panels
- Construction Window - Windows
- Construction Door - Doors
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Chemistry
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Application Method
- Dispenser - Gun
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Cure Method
- Moisture / Condensation Cure - Moisture
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Color
- Gray : Aluminum
- Other - 11 standard stocked colors
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Key Specifications
- ASTM (American Standard Test Method) : C 920 : Class 25 - ASTM C 920, Type S, Grade NS, Class 25, Use NT, M, A and O (granite)
- TT (U.S. Federal Specification) : S-001543A - TT-S-01543A; TT-S-00230C, Type II, Class A ±25% movement capability
- TT (U.S. Federal Specification) : S-00230C : Class A - TT-S-01543A; TT-S-00230C, Type II, Class A ±25% movement capability
Specifications
Cure Specs
Application Temperature (°F) -20 to 120 Cure Temperature (°C) 25, 25 Test Method Cure Time (min) 180 to 360, 10,080 to 20,160 Test Method Bond Strength
General Bond Strength (psi) Balanced Peel Strength (piw) 20 to 28 (lb/in) Test Method Tensile Strength (psi) 180 Test Method Material Resistance
Environmental Resistance Unique High Temperature Resistance (°C) 121 Low Temperature Resistance (°C) -40 Hardness
Shore A Hardness 25, 20 to 30 Test Method Elongation (%) 6 Test Method Modulus (psi) Medium Business Information
Shelf Life Details Dow Corning Contractors Weatherproofing Sealant has a shelf 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 Silicone structural glazing, Application in confined areas without proper ventilation, Joints under constant water submersion -
Best Practices for Dow Contractors Weatherproofing Sealant
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Surface Preparation
The joint interface must be clean, dry and free from oils, loose mortar, laitance, form release agents, waterproofings, dampproofings and other contaminants. A thorough wire brushing, grinding, sandblasting or solvent cleaning may be required to expose clean, sound, virgin surface.
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Application
Install backer material or joint filler, setting blocks, spacer shims and tapes as specified. Apply sealant in a continuous operation, using a positive pressure adequate to properly fill and seal the joint.
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Clean-Up
Immediately remove all excess sealant and smears adjacent to the joint with Xylol or Toluol as work progresses.
Follow solvent manufacturer’s recommended safe handling instructions and applicable federal, state and local regulations.
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
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25°C | Cure rate at 77°F and 50% RH, Initial skinning |
25°C | Cure rate at 77°F and 50% RH, Through cure (3/8" [9 mm] depth) |
Cure Time Test Methods
Cure Time | Test Method |
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180 to 360 min | Cure rate at 77°F and 50% RH, Initial skinning |
10,080 to 20,160 min | Cure rate at 77°F and 50% RH, Through cure (3/8" [9 mm] depth) |
Peel Strength Test Methods
Peel Strength | Test Method |
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20 to 28 (lb/in) | ASTM C 794 |
Tensile Strength Test Methods
Tensile Strength | Test Method |
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180 psi | ASTM D 412 |
Elongation Test Methods
Elongation | Test Method |
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6 % | ASTM D 412, Ultimate |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method |
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25 | Hardness/Durometer Test Method |
20 to 30 | ASTM C 661, at Standard Conditions |

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