Silicone Primer (Dowsil 1200 OS)
- Improves adhesion of silicone
- Low VOC
- Contents: 500 ml
Dowsil 1200 OS Primer is used to improve adhesion and accelerate the adhesion build-up of silicone elastomers to various substrates.This moisture-curing primer is formulated as a diluted solution of reactive materials in low-viscosity siloxane, ensuring optimal adhesion and durable results on a wide range of surfaces. Dowsil is particularly suitable for improving adhesion of silicones to metals. Always perform a test before using the primer.
Features
- Improves adhesion of silicone elastomers and foams to many substrates.
- Provides stonger and more uniform bonds.
- Low VOC content of 76 g/l.
- Formulated for low toxicity.
- Resistant to ozone, ultra-violet radiation and temperature extremes.
- Suitable for weather sealing and structural glazing.
Directions for use
For many substrates, significantly stronger and more uniform bonds can be achieved by first treating the surface with a primer before applying the silicone sealant. For best results, follow the steps below (not applicable to silicone rubber):
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If necessary, thoroughly clean and degrease the surface with two cloths and a suitable solvent. Allow the surface to dry.
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Apply a thin layer of DOWSIL 1200 OS Primer with a clean white cloth or brush. In most cases, a thin layer provides the best adhesion. If a white chalky residue after a few minutes of drying, wipe it off with a clean cloth.
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Allow the primer to air dry for 15 to 90 minutes under normal temperature and humidity conditions (room temperature, approx. 50% RH). As the primer cures upon contact with moisture in the air, lower humidity will require a longer drying time. Determine the optimal drying time for your specific conditions beforehand. Please note: primer that cures for too long will no longer improve adhesion. Therefore, avoid drying times longer than approximately 6 hours under normal conditions.
- Apply silicone sealant.
Specifications
Contents: 500 ml
Colour: transparent
Viscosity: 1 mPa.s (at 23°C)
Flash point: 27°C
VOC content: 76 g/l
Specific gravity: 0.84 (at 23°C)
Shelf life: 18 months (stored below 25°C in unopened container)
We have a number of recommendations for working safely with polymers. At Polyestershoppen you will not only find the polymers themselves, but you can also purchase all the protective equipment you need from us. If you have any doubts or questions, please contact our customer service. We can give you advice on how to work safely with polymers.
