TEKNODUR COMBI 340-811
Polyurethane Paint
- Corrosion protective
- UV resistant
- 2-component
- Solvent-borne
TEKNODUR COMBI 340-811 is a two pack anticorrosive pigmented polyurethane paint with low solvent content where the hardener used is an aliphatic isocyanate resin.
TEKNODUR COMBI 340-811 is used so-called one layer paint. The paint can also be used as a top coat in Polyurethane Coating Systems. It is suitable to use on steel surfaces. The paint produces a film with good mechanical and weather resistance properties. The use of TEKNODUR 0290 Polyurethane varnish is recommended on objects when the topcoat is required to have excellent gloss and colour retention.
Surface preparation
Remove from the surfaces any contaminants that might be detrimental to surface preparation and application. Remove also water-soluble salts by using appropriate methods. The surfaces are prepared according to the different materials as follows:
STEEL SURFACES: Remove mill scale and rust by blast cleaning to preparation grade Sa 2½ (standard ISO 8501-1). Roughening the surface of thin-plate improves the adhesion of the paint to the substrate.
OLD PAINTED SURFACES SUITABLE FOR OVERCOATING: Any impurities that might be detrimental to the application of paint (e.g. grease and salts) are removed. The surfaces must be dry and clean. Old, painted surfaces that have exceeded the maximum overcoating time are to be roughened as well. Damaged parts are prepared in accordance with the requirements of the substrate and the maintenance coating.
The place and time of the preparation are to be chosen so that the prepared surface will not get dirty or damp before the subsequent treatment.
Additional instructive information for surface preparation can be found in standards EN ISO 12944-4 and ISO 8501-2.
Application
Take into consideration the pot life of the mixture when estimating the amount to be mixed at a time. Before application the base and hardener are mixed in right proportion. Stir thoroughly down to the bottom of the vessel. Inadequate stirring or incorrect mixing ratio results in imperfect curing and impaired film properties.
Stir thoroughly before use. Before use clean the spray gun and paint vessels with a thinner suitable for the paint.
Application conditions
The surface to be treated must be dry. During the application and drying period the temperature of the ambient air, the surface and the product shall be above +5°C and the relative air humidity below 80%. Additionally, the temperature of the surface to be treated and the product must be at least +3°C above the dew point of the ambient air.
Storage
The storage stability is shown on the label. The hardener reacts with air humidity. Store in a cool place and in tightly closed containers. Use opened hardener within two weeks.
Application methods
Suitable airless nozzle size 0.011 - 0.015".
| Total mass of solids | abt. 1050 g/l |
|---|---|
| Volatile organic compound (VOC) | abt. 275 g/l |
| Pot life | 60 min (+23 °C) |
| Hardener | Comp. B: TEKNODUR HARDENER 7295 |
| Gloss | Gloss |
| Tinting system | Teknotint |
| Practical spreading rate | The values depend on the application technique, surface conditions, overspray, etc. |
| Drying time – dust free | 70 min (ISO 9117-3:2010 |
| Drying time – touch dry | 8 h (ISO 9117-5:2012) |
| Drying time – forced drying | 1 h, +60 °C |
| Thinner | TEKNOSOLV 1602 or TEKNOSOLV 9521 |
| Clean up | TEKNOCLEAN 6496 |
| Colours | By agreement. |
| Safety markings | See safety data sheet. The hardener of the product and the ready mixture contain isocyanates. In poorly ventilated areas and especially when using spray application we recommend the use of a fresh air mask. In short or temporary work, a mask with combined filter A2-P2 can be used. In this case eyes and face are to be protected. The hardener can must be opened with caution, as pressure may develop in the can during storage. |