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Applications & Uses
- Applications
- Coating Type
- Application
SILIKAL® R 81 is used primarily as a colorless top coat for decorative SILIKAL® Colored Flakes and SILIKAL® Colored Quartz surfaces. It is possible to apply two coats to the thickness envisaged.
Advice on Application:
Once moderately sized batches (5 – 10 kg) have been mixed with the necessary quantity of hardener as laid down in the “Hardener dosages” table, the resin is immediately poured onto the surface and applied crosswise, preferably by means of a paint roller. Although it is possible to spread it roughly with a rubber blade fi rst, the dwell time of the still liquid resin until fi nal leveling on a colored flake surface must not be too long, as this may partly dissolve and leave color tracks behind. It is essential that no puddles form! To ensure the best possible properties, the minimum and maximum coating thickness must be observed. Material consumption for smooth coatings is approx. 400 g/m2 per application and on areas sprinkled with SILIKAL® Filler QS 0.7 – 1.2 mm approx. 500 g/m2 . If the coat thickness is exceeded (more than 800 g/m2 ), the resin will tend to fl ake and yellow. If the thickness is too low, excessively high monomer loss may occur, leading to insuffi cient hardness or lower water resistance. Under braking strains the thermoplastic character of the surface may lead to tire marks which in many cases can be removed again using suitable cleaning agents. It makes sense for the user to protect the surface against damage through careful use and care. Often it would be advisable to ensure that fork-lift trucks are driven appropriately, black tires are exchanged for white ones or a surface care agent (e. g. SILIKAL® Protect) is used.
Pigmenting:
If pigmentation is nevertheless essential, 10 % SILIKAL® Pigment Powder is usually added. To avoid lumps in the pigment, it must fi rst be dispersed with the same quantity of resin by means of a dissolver to eliminate lumps. After the dispersion process the residual quantity of resin is added to the new pigment paste until the total content of the mix is again 10 %. You must make particularly sure that pigments which are not made by SILIKAL® are properly tested for their compatibility and storage stability.
- Suggested Coating System
- Colorless top coat
- Pigmented top coat
- Hardener Dosages
Temperature Hardening Powder (% pbw.*) Pot life (approx. min.) Hardening time (approx. min.)
0°C 3 20 40 10°C 2 20 40 20°C 1 15 30 30°C 1 8 20 * The quantity of hardening powder is always related to the quantity of resin.
Properties
- Resin Properties
| Value | Units | Test Method / Conditions | |
| Viscosity (20°C) | approx. 120 | mPa.s | DIN 53 015 |
| Flow Time (20°C, 4 mm Cup) | 28 - 32 | sec. | ISO 2431 |
| Density (D₄²⁰) | 0.98 | g/cm³ | DIN 51 757 |
| Flash Point | 10.0 | °C | DIN 51 755 |
| Pot Life (20°C, 100 g, 3 % pbw. Hardening Powder) | approx. 15 min. | — | — |
| Application Temperature | 0 - 30 | °C | — |
| Density (Hardened state) | 1.14 | g/cm³ | DIN 53 479 |
| Ultimate Elongation (Hardened state) | 2.7 | % | DIN 53 455 |
| Hardness (Hardened state) | 75.0 | Shore-D | DIN 53 505 |
| Water Absorption (4 Days, Hardened State, 50·50·4 mm) | 125.0 | mg | DIN 53 495 |
| Water Vapour Permeability (Hardened state) | 1.05*10⁻¹¹ | g/cm·h·Pa | DIN 53 122 |