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Description for Dow 888 Silicone Joint Sealant
One-part, non-sag silicone material that cures to a low-modulus silicone rubber upon exposure to atmospheric moisture. Can be applied over a wide temperature range.Chemical Resistance Fuel resistant short-term exposure. Application Type Bond, Repair, Sealant 1 Part or 2 Part 1-Part Material Form Paste Substrate Concrete, Silicone rubber, Portland cement concrete (PCC) Industry May be used in joints that are not uniform in width., Joint sealant, May also be used in joints with minor spalling., Joint sealant can be used for concrete to concrete pavement joints Manufacturer Dow Chemistry Silicone Cure Method Moisture, Room temperature cure Cure Temperature (°C) 23, 25 Cure Time (min) 30,240, 30,240 Viscosity (cPs) Non-sag Color Gray High Temperature Resistance (°C) 49 Low Temperature Resistance (°C) -29 Extrusion Rate (g/sec) 72 (mL/min) Key Specifications ASTM D 5893 Type NS, TT (U.S. Federal Specification): S-001543A: Meets and exceeds TT-S-001543A Class A(one-part silicone sealants); TT-S-00230C Class A (one-component sealants) -
Technical Data for Dow 888 Silicone Joint Sealant
Overview
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Chemical Resistance
- Chemical Resistance - Fuel resistant short-term exposure.
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Application Type
- Adhesive - Bond
- Repair & Maintenance - Repair
- Sealant
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1 Part or 2 Part
- 1-Part
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Material Form
- Paste
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Substrate
- Concrete - Portland cement concrete (PCC)
- Silicone Rubber
- Other - Irregular surfaces
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Industry
- Other Transportation - Airport
- Industrial - Bridge joints
- Joints - May be used in joints that are not uniform in width., May also be used in joints with minor spalling., Joint sealant can be used for concrete to concrete pavement joints, Joint sealant
- Construction - For use in new construction applications., Highway
- Other - For use in repair applications, For use in remedial applications
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Chemistry
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Application Method
- Dispenser - Air-powered pump
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Cure Method
- Room Temperature / Air Dry - Room temperature cure
- Moisture / Condensation Cure - Moisture
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Color
- Gray
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Key Specifications
- ASTM (American Standard Test Method) - ASTM D 5893 Type NS
- TT (U.S. Federal Specification) : S-001543A : Class A - Meets and exceeds TT-S-001543A Class A(one-part silicone sealants); TT-S-00230C Class A (one-component sealants)
Specifications
Cure Specs
Cure Temperature (°C) 23, 25 Test Method Cure Time (min) 30,240, 30,240 Test Method Viscosity (cPs) Non-sag Tack Free Time (min) <300 Test Method Bond Strength
Tensile Strength (psi) 28 Test Method Material Resistance
UV Resistance UV resistant Environmental Resistance Weather resistant High Temperature Resistance (°C) 49 Low Temperature Resistance (°C) -29 Hardness
Shore A Hardness 15 Test Method Elongation (%) >1,000 Test Method Flexibility Flexible Modulus (psi) Low Other Properties
Extrusion Rate (g/sec) 72 (mL/min) Specific Gravity 1.480 Test Method Business Information
Shelf Life Details When stored in original, unopened containers between 0°C (32°F) and 32°C (90°F), Dow Corning 888 Silicone Joint Sealant has a shelf life of 12 months from date of manufacture.Keep containers tightly closed. Refer to product packaging for “Use By Date.” Shelf Life Type From date of manufacture Shelf Life (mon) 12 -
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Best Practices for Dow 888 Silicone Joint Sealant
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Surface Preparation
For optimum adhesion, the surface must be clean, dry and frost-free.
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Application
Cold applied, ready-to-use as supplied
dispensed directly from the bulk container into the joint by hand or with an air-powered pump.
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
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23°C | As Supplied, 50% R.H, D 5893 Requirement, These values are not intended for use in preparing specification |
25°C | 50% RH., These values are not intended for use in preparing specifications., As Supplied |
Cure Time Test Methods
Cure Time | Test Method |
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30,240 min | As Supplied, 50% R.H, D 5893 Requirement, These values are not intended for use in preparing specification |
30,240 min | 50% RH., These values are not intended for use in preparing specifications., As Supplied |
Tack Free Time Test Methods
Tack Free Time | Test Method |
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<300 min | ASTM C 679, Pass, As Supplied, D 5893 Requirement. These values are not intended for use in preparing specifications. |
Tensile Strength Test Methods
Tensile Strength | Test Method |
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28 psi | ASTM D 412 (Die C), Tensile Stress @ 150%, 45 psi max, D 5893 Requirement, These values are not intended for use in preparing specification |
Elongation Test Methods
Elongation | Test Method |
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>1,000 % | As Cured – 21 days at 25°C (77°F) and 50% RH, ASTM D 412 (Die C), Ultimate Elongation 600% min, D 5893 Requirement, these values are not intended for use in preparing specification |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method |
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15 | As Supplied, ASTM C 661, Durometer Shore A-2, These values are not intended for use in preparing specifications, 25 maximum, D 5893 Requirement |
Specific Gravity Test Methods
Specific Gravity | Test Method |
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1.480 | ASTM C 792, As Supplied, these values are not intended for use in preparing specifications |