Polyester
Introduction
Recommended for general exterior situations, where good weathering resistance
is required. A specialised grade is available for architectural applications.
Specification
| Supply form | Fine powder suitable for all types of electrostatic spray equipment. |
| Specific gravity | 1.2 – 1.7, depending on colour. |
| Storage | Cool and dry below 25°C. |
Appearance Characteristics
| Colour | Wide range available to all common colour standards and to order. |
| Gloss | Full range available from full gloss to matt. |
| Aesthetic variants | Textured versions are available. |
Film Performance
Meets the following criteria, as determined on 0.8mm. mild steel test panels pre-treated with medium weight zinc phosphate, to which a typical non-textured product was applied, at a film thickness of 50-60 microns and cured at 10 minutes @ 180°C metal temperature.
N.B. Some products within this range may be cured at different schedules, see box label or individual product data sheet for details. Typical values are noted under `Curing Conditions'.
Curing Conditions
| High bake type | 200°C @ 10 minutes metal temperature |
| Standard bake type | 180°C @ 10 minutes metal temperature. |
| Low bake type | 160-170°C @ 10 minutes metal temperature. |
Film Properties
(a) Mechanical Properties
| Mandrel bend | BS3900 E1 | Pass 2mm |
| Cross hatch adhesion | BS3900 E6 | No loss of adhesion |
| Impact resistance | ASTM D2794 | Pass 100 in/Ib |
| Scratch test | BS3900 E2 | Pass 4kg |
| Taber abrasion resistance | Excellent | |
| Erichsen pencil hardness | H-3H depending on formulation type | |
| Erichsen Indentation | 7-9.5mm depending on formula type | |
(b) Typical Environmental Resistance Properties
| Salt fog resistance ASTM
B117 (500 hours) Humidity resistance BS3900 F2 (500 hours) Exterior exposure (12 months) |
Maximum 2mm creep No blistering Good colour and gloss retention |
|
(c) Continuous Heat Resistance
Good colour stability up to 130°C, or intermittent exposure up to 140°C, depending on formula type.
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
Good quality pre-treatment is essential if the excellent properties of these products are to be obtained under field conditions. The type of pre-treatment will vary according to the metal substrate to be used. As a general rule, the article to be coated must be free from all surface contaminants and must then be treated with a suitable metal surface conversion pre-treatment, e.g. iron phosphate, zinc phosphate or chromium type systems.
Our technical service department will be pleased to offer further advice on this subject if required.
Application Guidelines
Becker Powder Coatings' Polyesters are suitable for use with all types of electrostatic powder spraying equipment. Our attention to processing and formulation detail ensures optimum transfer efficiency. Specially formulated versions of these products are available for use with `Tribostatic' application equipment on request.
| 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. |
