Precision Dip Coating utilizes a hybrid Polyolefin material supplied by Punda Mercantile. Plascoat PPA 571 has been specifically designed to provide a long lasting, tough coating for exterior applications to mild steel, galvanised steel and aluminum. It is based on an alloy of acid modified polyolefins. Therefore it is halogen free and the combustion fumes are low in smoke and have a very low toxicity index.
Plascoat PPA 571 is resistant to stress cracking, adverse weather conditions, detergents, salt spray and typical airborne pollutants. The coating maintains excellent adhesion to the metal substrate without the need for a separate primer. The material also provides a good degree of electrical insulation, abrasion and impact resistance.
* taken from Plascoat PPA-571 technical specifications
| Recommended Coating Thickness | 300-750 µ | |
| Appearance | Smooth/Glossy | |
| Gloss | ISO 2813 | 70 |
| Impact Strength | Gardner (drop weight) ISO 6272 | |
| Direct 23°C (3mm plate) | 2.7 Joules | |
| Indirect 0°C (3mm plate) | 18.0 Joules | |
| Gardner (drop weight) ISO 6272 | > 27 Joules | |
| Direct 23°C (0.7mm plate)
Indirect 0°C (0.7mm plate) |
> 27 Joules | |
| Abrasion | Taber ASTM D4060/84 H18, 500g load, 1000 cycles |
60 mg weight loss |
| Salt Spray | ISO 7253 | Results after 1000 hours |
| Steel – Scribed | Loss of adhesion less than 10mm from scribe.
Under film corrosion 2-3mm |
|
| - Unscribed | No loss of adhesion | |
| Aluminium – Scribed | No loss of adhesion | |
| - Unscribed | No loss of adhesion | |
| Chemical Resistance* | - Dilute Acids 60°C | Good |
| - Dilute Alkali 60°C | Good | |
| - Salts (except peroxides) 60°C | Good | |
| - Solvents 23°C | Poor | |
| Adhesion | PSL, TM 19 | A-1 |
| Weathering | QUV ASTM G53-77 | 2000 hrs – No significant change in colour or loss of gloss. |
| Florida 45° facing South | 3 years – No significant change in colour or loss of gloss. | |
| Burning Characteristics | ||
| Ignitability | BS476: Pt5: 1979
500 micron coating |
P – not easily ignitable |
| Surface spread of flame | BS476: Pt7: 1979
500 micron coating |
Class 1 |
| Fire Propagation | BS476: Pt6: 1989
500 micron coating |
I = 0.2 |
| Flammability | UL94 | Vo (see also Properties of Material) |
| Safe Working Temperature | (Continuous in air) | 60°C max |
