Dow 902 RCS Joint Sealant

Dow 902 RCS Joint Sealant Datasheet
  • Description for Dow 902 RCS Joint Sealant

    Rapid cure; high movement capability; seals irregular surfaces; good weatherability; all temperature gunnability.

    *See Terms of Use Below

    Application Type Bond, Repair, Sealant
    1 Part or 2 Part 2 Part
    Material Form Liquid
    Substrate 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

    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 2 Part
      • Part A Name - Part A
      • Part B Name - Part B
    • Material Form
      • Liquid
    • Substrate
      • Concrete - Polymer concrete
      • Steel - Carbon steel, Steel joint surfaces
      • Stone - Portland cement concrete surfaces
      • Other - Asphalt, Cork, Irregular surfaces
    • Industry
    • Chemistry
    • Cure Method
      • 2-Part Cure - Part A/Part B
    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
    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
  • Best Practices for Dow 902 RCS Joint Sealant

    *See Terms of Use Below

    1. Surface Preparation

      joint be clean and dry.

      See Vendor Technical Data Sheet for more info.

    2. 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
25°C As Installed – At 25°C (77°F) and 50 percent Relative Humidity
Cure Time Test Methods
Cure Time Test Method
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
6 % At 25°C (77°F) and 50 percent Relative Humidity
Modulus Test Methods
Modulus Test Method
Ultra-low Modulus Test Method
3 to 12 (Joint (psi)) At 25°C (77°F) and 50 percent Relative Humidity