Knowde Enhanced TDS
Identification & Functionality
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Features & Benefits
- Ready-to-Use Product Features
Applications & Uses
- Application Method
- Application Details
Surfaces to be primed should be dry and free from grease, oil or other contaminants. The surface should first be cleaned with a non-polar solvent such as mineral spirits (at a boiling range of 80 °C up to 140 °C), followed by a polar solvent, preferably acetone. Loose particles must be removed, and very smooth surfaces should be roughened by grinding. The primer can be applied with a brush, by dipping or spraying. On relatively smooth, non-absorbent surfaces such as aluminum, the primer should be applied as thinly as possible and free of air bubbles.
In some cases further dilution with white spirit can improve adhesion, typical dilution ratio is between 1:1 and 1:3 primer/ white spirit b.w). Adhesion tests have to be carried out with original substrates prior to the final use.
After application the reaction of the primer film to firmly adhere to the surface needs some time. Recommended reaction time is between about 1 hour at ambient temperature (relative atmospheric humidity must be at least 40 % and should be monitored using a hygrometer) or alternatively 10 minutes at 100 °C (the latter only applies to metallic substrates). Tests for optimal conditions are recommended. The catalyzed silicone rubber should be applied to the primer coat immediately after the drying or heating process, if possible, but at the latest after 6 hours since otherwise a drop in adhesive strength may occur.
Important : Maximum adhesive strength will only be achieved after 4 days.In many cases the initial adhesion directly after vulcanization of the rubber is already sufficient for handling the composite. Once opened, containers of WACKER Primer FMP HC have to be kept well sealed and stored in a cool and dry place. Precipitations or turbidities in the bottle do indicate moisture access, commonly caused by repeated opening or insufficiently sealed bottles. In this case the primer reactivity can be diminished.
PRIMER FMP HC is a bonding agent which is preferably used with addition-curing RTV-2 silicone rubbers and LSR from the WACKER ELASTOSIL® series to achieve adhesion to metallic and non-metallic substrates.
Properties
- Uncured Properties
| Value | Units | Test Method / Conditions | |
| Density (at 25°C, 1013 hPa) | 0.732 | g/cm³ | Calculated |
| Flash Point | 2 | °C | DIN 53213 |
| Ignition Temperature | 375 | °C | DIN 51794 |
| Kinematic Viscosity | 0.8 | mm²/s | ISO 3104 |
| White Spirit Content | 85 | % | — |
Regulatory & Compliance
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Packaging & Availability
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Storage & Handling
- Storage Information
PRIMER FMP HC should be stored between 5°C and 30°C in the tightly closed original container.