Dow 902 RCS Joint Sealant

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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	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

Best Practices for Dow 902 RCS Joint Sealant

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Technical Data for Dow 902 RCS Joint Sealant

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Overview

Application Type
- Adhesive - Bond
- Repair & Maintenance - Repair
- Sealant
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
- Industrial - Bridges, Minor spalled joints
- Construction - Bridge joint resealing
Chemistry
- Silicone - Silicone rubber
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

Best Practices for Dow 902 RCS Joint Sealant

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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.
Comparable Materials for Dow 902 RCS Joint Sealant

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Spec Engine^® Results
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