Automotive
Matt Black Polyester Powders for the
Automotive Industry
Composition
Becker Powder Coatings' Polyester powder is a combination of Polyester
resins, hardeners and heat resisting, lightfast pigments combined with
special levelling agents to produce a matt finish with exceptional flow.
They are free-flowing powders of carefully controlled particle size
ensuring ease of handling and application.
Becker Powder Coatings' Matt and Semi Matt Black Polyester powders have
been formulated to meet the requirements of the automotive industry
where a coating with exceptional weathering properties is required.
Specification
| Supply form | Fine powder below 104 microns |
| Specific gravity | 1.45 |
| Shelf life | 6 months from date of despatch |
| Storage | Cool and dry below 25°C |
| Stoving | See individual product information |
Automotive Industry Specifications
| Ford | WSK/MIJ207/A WSK/M2P141, A1, A2, A3 WSK/M70J9/A SKM-2P-9565A |
Rover Group | PP277 PP290 PP253 PP292 |
| Peugeot-Talbot | MED/77/896 MED/77/895 |
General Motors | GME00200 GME00202 |
Film Properties
Becker Powder Coatings' Polyester powder provides a coating with excellent weathering properties and resistance to corrosion and mechanical damage. The following data was established using test panels approximately 1 mm thick, zinc phosphated and coated with 60 microns of Matt Black powder, cured for 10 minutes at a metal temperature of 200°C.
Mechanical Properties
| Cross hatch | BS3900E6 | No loss of adhesion |
| Mandrel bend test | BS3900 E1 | Pass |
| Impact resistance | ASTM D2794 | 20 in/Ibs pass |
| Scratch test | BS3900 E2 | 4kg |
| Abrasion resistance (Taber) | Good | |
| Erichsen pencil hardness | 3H | |
| Erichsen cupping test | 6.0mm indentation | |
Corrosion Resistance
| Salt spray ASTM B117 |
500 hours | Less than 1 mm creep |
| Humidity BS3900F2 | 1,000 hours | No blistering |
| Exterior exposure | Florida 12 months | Excellent colour retention minimum chalking |
Chemical Resistance
| Hot oil | No effect | Hydrochloric acid 10% | No effect |
| Anti-freeze | No effect | Phosphoric acid 10% | No effect |
| Sulphuric acid 10% | No effect | Detergent 1% | No effect |
| Brake fluid DOT 3 | Softening | Sodium chloride 10% | No effect |
| Petrol resistance | No effect |  |
|
Pre-treatment
Becker Powder Coatings' Polyester powders adhere to most metals and do not require primers. Articles to be coated must be free from rust, grease, oil and mill-scale. Adhesion and corrosion resistance are greatly improved when the metal substrate is subjected to a chemical pre-treatment prior to coating. To meet automotive industry specification requirements, it is normally necessary to use one of the pre-treatments listed below according to the substrate being used, for example:
| Mild Steel | Iron or zinc phosphate |
| Aluminium | Chromate conversion |
| Zinc alloy | Zinc phosphate or chromate |
Our technical service department will be pleased to offer advice on this subject.
Application Guidelines
Becker Powder Coatings' spraying 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. |
