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Description for Dow 902 RCS Joint Sealant
Rapid cure; high movement capability; seals irregular surfaces; good weatherability; all temperature gunnability.Application Type Bond, Repair, Sealant 1 Part or 2 Part 2-Part Material Form Liquid Substrate Cork, Carbon steel, Portland cement concrete surfaces, Polymer concrete, Steel, Concrete, Steel joint surfaces Manufacturer Dow Chemistry Silicone rubber Cure Method Part A/Part B Cure Temperature (°C) 25 Cure Time (min) Rapid, 480 Viscosity (cPs) Self-leveling High Temperature Resistance (°C) 149 Low Temperature Resistance (°C) -45 -
Technical Data for Dow 902 RCS Joint Sealant
Overview
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Application Type
- Adhesive - Bond
- Repair & Maintenance - Repair
- Sealant
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1 Part or 2 Part
- 2-Part
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Material Form
- Liquid
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Industry
- Industrial - Bridges, Minor spalled joints
- Construction - Bridge joint resealing
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Chemistry
- Silicone - Silicone rubber
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Cure Method
- 2-Part Cure - Part A/Part B
Specifications
Cure Specs
Cure Temperature (°C) 25 Test Method Cure Time (min) Rapid, 480 Test Method Viscosity (cPs) Self-leveling Tack Free Time (min) 30 to 60 Test Method Work / Pot Time (min) 10 to 15, <20 Test Method Mix Ratio 1:1 (by volume) Material Resistance
High Temperature Resistance (°C) 149 Low Temperature Resistance (°C) -45 Hardness
Elongation (%) 6 Test Method Flexibility Fully elastic Modulus (psi) Ultra-low, 3 to 12 (Joint (psi)) Test Method Other Properties
Specific Gravity 1.260 to 1.340 Flash Point (°F) 213.8 Business Information
Shelf Life Details When stored in original, unopened containers between 0 and 32°C (32 and 90°F), Dow Corning 902 RCS Joint Sealant has a shelf life of 12 months from date of manufacture. Refer to product packaging for “Use By” date., Keep containers tightly closed. Shelf Life Temperature (°F) 32 to 90 Shelf Life Type from date of manufacture Shelf Life (mon) 12 -
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Best Practices for Dow 902 RCS Joint Sealant
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Surface Preparation
joint be clean and dry.
See Vendor Technical Data Sheet for more info.
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Application
Dow Corning 902 RCS Joint Sealant comes in kits consisting of two 20-fl oz E-Z Pak sausages: Part A (black) and Part B (white). With a dual sausage pneumatic gun (such as Model 635-1 supplied by Albion Engineering Co., Inc.1), load Parts A and B into the designated sides so that the crimped end is approximately 1/2 inch (13 mm) above the end of the cylinder. To open the sausage pak (see Figure 3), cut off the exposed crimped end of Part B. Repeat this step for Part A. Quickly attach the rear housing and static mixer. The materials are then dispensed at a predetermined ratio of 1:1 by volume through the static mixer and into the joint. The extruded material must be gray in color. Guidelines for the proper use of Dow Corning 902 RCS Joint Sealant include: The inlet air pressure to the gun should not exceed the gun manufacturer’s recommendation.
The recommended static mixer should have a minimum 1/2 inch (13 mm) inside diameter and sufficient mixing elements to give the desired color. An example of a typical static mixer that can be used is one that has a 12 inch (305 mm) long plastic shell by 1/2 inch (13 mm) inside diameter, with a minimum of 8 inches (203 mm) of mixing elements.
Prior to attaching the static mixer to the gun, dispense a small amount of material (A and B) to ensure the gun is dispensing both parts.
To continue using the same static mixer, do not allow elapsed time to exceed 5 minutes when changing kits. The mixer should not remain inactive for longer than 5 minutes.
See Vendor Technical Data Sheet for more info.
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
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25°C | As Installed – At 25°C (77°F) and 50 percent Relative Humidity |
Cure Time Test Methods
Cure Time | Test Method |
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Rapid | |
480 min |
Tack Free Time Test Methods
Tack Free Time | Tack Free Temperature | Test Method |
---|---|---|
30 to 60 min | 25°C | 50 percent Relative Humidity |
Work / Pot Time Test Methods
Work / Pot Time | Test Method | Temperature |
---|---|---|
10 to 15 min | 50 percent Relative Humidity | 25°C |
<20 min | 50 percent Relative Humidity | 25°C |
Elongation Test Methods
Elongation | Test Method |
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6 % | At 25°C (77°F) and 50 percent Relative Humidity |
Modulus Test Methods
Modulus | Test Method |
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Ultra-low | Modulus Test Method |
3 to 12 (Joint (psi)) | At 25°C (77°F) and 50 percent Relative Humidity |