Dow Dowsil PR-1204 RTV Prime Coat Datasheet Dow Dowsil PR-1204 RTV Prime Coat

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  • Description for Dow Dowsil PR-1204 RTV Prime Coat

    Enhances bonding/adhesion of RTV and heat cure silicones to many metals, ceramics, glass and masonry.

    *See Terms of Use Below

    Brand Dowsil
    Application Type Bonding, Prime Coat
    1 Part or 2 Part 1-Part
    Material Form Liquid
    Substrate Ceramics, Glass, Many metals
    Industry PCB systems assemblies, Smart Meters, Displays, E-Mobility Solutions, Smart Home Devices
    Manufacturer Dow
    Chemistry Solvent-Based
    Cure Method Solvent, RTV, Moisture cure, Mild heat acceleration, Room temperature cure
    Cure Temperature (°C) 20 to 25 Room temperature
    High Temperature Resistance (°C) <60
    Can Be Used In Conjunction With These Materials Many moisture cure RTV silicones, Heat cure silicones
  • Technical Data for Dow Dowsil PR-1204 RTV Prime Coat

    • Application Type
    • 1 Part or 2 Part
      • 1-Part
    • Material Form
      • Liquid
    • Substrate
    • Industry
      • Displays
      • Smart Meters
      • Smart Home Devices
      • E-Mobility Solutions
      • Electronics - PCB systems assemblies
      • Construction - Masonry
    • Chemistry
    • Application Method
      • Spray - Spraying
      • Dip - Dipping
      • Other - Wiping
    • Cure Method
      • Room Temperature / Air Dry - Room temperature cure
      • Solvent
      • Moisture / Condensation Cure - Moisture cure
      • Heat - Mild heat acceleration
      • RTV (Room Temperature Vulcanization) - RTV
    • Can Be Used In Conjunction With These Materials
      • Silicones - Many moisture cure RTV silicones, Heat cure silicones
    • Brand
      • Dowsil
    Cure Specs
    Cure Temperature (°C) 20 to 25 Room temperature
    Bond Strength
    Peel Strength (piw) 66 (ppi) Test Method
    Material Resistance
    High Temperature Resistance (°C) <60
    Business Information
    Shelf Life Details Shelf life is indicated by the “Use Before” date found on the product label. For best results, Dow Corning primers, prime coats and adhesion promoters should be stored below 32°C (90°F).
    Shelf Life Temperature (°F) 77, <90
    Shelf Life (mon) 18
  • Best Practices for Dow Dowsil PR-1204 RTV Prime Coat

    *See Terms of Use Below

    1. Surface Preparation

      The active ingredients must thoroughly wet out and coat the bonding surfaces. Mild abrasion, solvent cleaning, plasma, corona discharge and other pretreatments have been used to clean and enhance surface reactivity to bonding. In general, light surface abrasion is recommended whenever possible, because it promotes good cleaning and increases the surface area for bonding. Surfaces should be cleaned and/or degreased with naphtha, mineral spirits, methyl ethyl ketone (MEK) or other suitable solvents that will remove oils and other contaminants that may be present. A final surface wipe with acetone or IPA may also be helpful. Different cleaning techniques may give better results than others. Users should determine the best technique for their applications. For especially difficult-to-bond-to surfaces, it may be necessary to increase the surface reactivity by chemical etchants or oxidizers, or by exposing the surface to UV, corona, plasma or flame sources. Allow solvents to completely evaporate before applying the primer.

    2. Application

      These products should be applied in a very light, even coat by wiping, dipping or spraying. Excess material should be wiped off to avoid overapplication, which generally appears as a white, chalky surface. When dip or spray coating, diluting by a factor of 2 to 4 with additional solvent may avoid excessive build-up. Apply additional cleaner/primer to the cloth every 3 to 5 minutes to ensure fresh material can react with the substrate.

    3. Curing

      These products require moisture in the air to cure, and are generally cured at room temperature and in a range of 20 to 90 percent relative humidity for 1 to 2 hours. Low humidity and/or low temperature conditions require longer cure times. Mild heat acceleration of the cure rate may be possible but temperatures above 60°C (140°F) are not recommended. During application, the carrier solvent typically evaporates off quickly, allowing the active ingredients to begin to react with atmospheric moisture and bonding surfaces. For optimal bonding, different cure times may be required for different temperature and humidity conditions. Users should determine the best cure schedule and conditions for their applications. The desired silicone elastomer should be applied after the primer, prime coat or adhesion promoter has fully cured.

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Peel Strength Test Methods
Peel Strength Type Substrate
66 (ppi) 180 Degree Peel Strength Aluminum