Polyurethane Range
Introduction
Recommended for use in exterior situations when lower film builds with superior flow are particularly important. Specialised versions are available where high surface hardness is required, e.g. anti-vandal coatings, stain resistant coatings. A small amount of volatile by-product is present in most polyurethane powder coatings. Oven ventilation may need to be slightly adjusted to facilitate extraction. Advice on this is available if required. As with all other Becker Powder Coatings' products, our attention to particle size control and formulation ensures optimum transfer efficiency, giving the user the opportunity to have better control over application costs.
Colour
Wide range available to order.
Gloss
Full gloss: 85% @ 60°
Semi gloss: 60-75% @ 60°
Film Properties: Standard "Decorative" Polyurethane Coating
Meets the following criteria:
| Mandrel bend | BS3900 E1 | Pass 6mm |
| Scratch | BS3900 E2 | Pass 4kg |
| Impact | ASTM D2794 | Pass 80in/Ib |
| Adhesion | BS3900 E6 | No detachment |
| Humidity | BS3900 F2 | Pass 1000 hrs: no blistering |
| Salt Fog | ASTM B117 | Max. 2mm creep @ 500 hrs |
| Erichsen indentation |  |
8-10mm |
| Exterior exposure | 12 months | Excellent gloss and colour retention |
| QUV 'B' exposure | 200 hrs | Minimal change |
* Substrate used in obtaining performance data was 20-gauge mild steel pre-treated using a medium weight zinc phosphate.
Heat Stability
Good colour stability on continuous exposure up to 120°C or intermittent exposure up to 130°C.
Specific Gravity
1.4 – 1.8 depending on colour, gloss, and other properties.
Coverage
11 – 14 sq.m/kg @ 50 microns (100% utilisation assumed), depending on colour and gloss.
Film Thickness
Recommended 50-75 microns for most applications.
Curing Conditions
Standard Bake type: 200°C/10 mins object temperature.
Storage and Handling
Store in dry, cool conditions, preferably below 25°C. Shelf life under these conditions will be approx. 12 months. For full information on handling this product type, refer to individual Safety Data Sheet, and the ‘Code of Safe Practice' issued by the British Coatings Federation.
Pre-treatment
Becker Powder Coatings' polyurethane powders adhere to most metals and do not require primers. Articles to be coated must be free from rust, grease, oil and mill scale. In order to improve corrosion resistance the use of iron phosphate or zinc phosphate is strongly recommended. Aluminium should be pre-treated using a chromate conversion system prior to powder coating. Zinc based die-castings and Zintec should also be pre-treated.
Our technical service department will be pleased to offer further advice on this subject if required.
Application Guidelines
Becker Powder Coatings' Polyurethane powders are suitable for use with all electrostatic powder spraying equipment. Voltages between 30-100kV may be applied. The powder is sprayed electrostatically onto earthed metallic substrates and an even layer of powder is deposited. When subjected to the correct temperature, the powder melts and flows to form a continuous film before curing, resulting in a coating with excellent mechanical properties and chemical resistance.
| Individual Product Information |
| Reference number |
| Colour |
| Gloss level |
| Specific gravity |
| Stoving schedule |
| Film thickness |
| SDS No |
| Health & Safety |
| We recommend all users of powder
coatings to refer to the Code of Safe Practice: Application of Powder
Coatings by Electrostatic Spraying (published by the British Coatings
Federation of Great Britain Ltd) and our appropriate Health &
Safety data sheet. May
00 |
| The information on this
sheet is based on experience or tests in the laboratory and is published
in good faith in the belief that it will be of value. We can accept no responsibility for loss or damage which may result from accident, misuse or operations not under our direct control. |
