Application Type Primer, Coating 1 Part or 2 Part 1 Part Material Form Liquid Substrate Ceramics, Composites, Composites, Plastics, Silicone Manufacturer Dow Chemistry Mixture Cure Method Moisture, Solvent, Air drying Cure Temperature (°C) 20 to 25 Cure Time (min) 60 to 120 Color Clear / Transparent
Technical Data for Dow 1205 Primer
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
- Other - Mixture
- Brush - Wiping
- Room Temperature / Air Dry - Air drying
- Moisture / Condensation Cure - Moisture
- Clear / Transparent
Cure Temperature (°C) 20 to 25 Cure Time (min) 60 to 120
Flash Point (°F) 41.0, 55.4
Shelf Life Details Dow Corning 1205 Prime Coat has a shelf life of 12 months from date of manufacture. Refer to product packaging for “Use By” date. For best results, store below 32°C (90°F). Containers should be kept tightly closed when not in use. After use, any remaining primer should be returned to a sealable container as soon as possible for storage., 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). Special precautions must be taken to prevent moisture from contacting these materials before use. Containers should be kept tightly closed and head or air space minimized. Partially filled containers should be purged with dry air or other gases such as nitrogen to maximize shelf life. Small amounts for immediate use should be poured into clean, dry containers and discarded when finished., Material should not be used once it takes on a milky appearance or a large amount of white precipitate is observed, indicating moisture contamination. Repeated opening of the container can cause a small amount of white precipitate to form inside the container cap area, which does not affect the bulk material. Shelf Life Type from date of manufacture Shelf Life (mon) 12
Best Practices for Dow 1205 Primer
Thoroughly clean all surfaces of dust, dirt, tar, oils and other debris. Remove rust from metal surfaces and scale by abrasive cleaning or wire brushing. Masonry surfaces should also be wire brushed and blown with compressed air to remove dust.
Thoroughly clean and degrease all surfaces with an industrial solvent such as IPA (isopropyl alcohol), naphtha, mineral spirits, xylene, toluene or MEK on a clean, oil-free rag.
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.
Apply Dow Corning 1205 Prime Coat to clean, dry surfaces by dipping, brushing or spraying. A coverage rate of about 400 ft2/gal (9.8 m2/L) is recommended on rough or porous substrates. On smooth metal or plastic surfaces, a coverage of 800 ft2/gal (19.6 m2/L) is possible.
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.
Allow the primer to dry and react with the surface for at least 15minutes. The exact time required depends upon temperature, humidity and the porosity of the substrate. It is the user’s responsibility to determine adequate primer dry times for specific applications.
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 (except in the case of Dow Corning 1593 Cleaner/Primer, where the solvent does not evaporate at all), 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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