Application Type Primer, Adhesion promoter 1 Part or 2 Part 1 Part Material Form Liquid Substrate Ceramics, Glass, Metals, Silicone Manufacturer Dow Chemistry OS-20(3) Cure Method Solvent, Moisture Cure Temperature (°C) 20 to 25 Cure Time (min) 60 to 120 Color Clear
Technical Data for Dow P5204 Adhesion Promoter
- Primer - Adhesion promoter
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
- Volatile Content: VOC - Low VOC
- Other - OS-20(3)
- Brush - Wiping
- Moisture / Condensation Cure - Moisture
- Clear / Transparent - Clear
Cure Temperature (°C) 20 to 25 Cure Time (min) 60 to 120
Flash Point (°F) 57.2 Test Method
Shelf Life Details Shelf life is indicated by the “Use By” 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 Type from date of manufacture Shelf Life (mon) 12
Best Practices for Dow P5204 Adhesion Promoter
The active ingredients must thoroughly wet-out and coat the bonding surfaces. Mild abrasion, solvent cleaning, plasma, corona discharge, and other pre-treatments 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 Dow Corning ® brand OS Fluids, 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.
These products should be applied in a very light, even coat by wiping, dipping or spraying. Excess material should be wiped off to avoid over-application, 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.
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 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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