Technical Resources Area
Technical Resources Area |
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GENERAL DESCRIPTION
Plascoat PPA 571 ES is a thermoplastic coating powder which has been specifically designed to provide a long lasting, tough coating for exterior applications to mild steel, galvanised steel and aluminium. 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 low toxicity index.
Plascoat PPA 571 ES 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 good abrasion and impact resistance.
f PPA 571 over-sprayed powder is to be recycled then blend a maximum of 25% of this over-sprayed powder with 75% of virgin powder.
For dip-coating, flock spraying or flame spraying please see the Plascoat PPA 571 data sheet.
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TYPICAL USES Fence posts, fencing panels, sign posts, street furniture, balustrading, stadium seating, pipes including potable water, cable tray and ducting. Garden furniture, gutter brackets, battery boxes, fan guards and wirework.
SUMMARY OF ESSENTIAL COATING REQUIREMENTS
*See "PPA 571 Processing Guide".
GUIDE TO TYPICAL COATING CONDITIONS
Recommended Pre-treatment: The metal must be degreased and all mill scale and corrosion products removed.
Mild steel should be solvent degreased then either grit blasted to Swedish Standard SA 2½ to 3 or phosphated. Galvanised steel should be solvent degreased if necessary. Then either grit blasted at 0.3MPa (40 psi) using a fine grit (0.2 to 0.5mm) or treated with a phosphate system. To achieve the maximum long-term adhesion, Plascoat recommend the use of zinc phosphate systems on both steel and galvanised steel. If chemical pre-treatment is used it is essential to remove any previously applied resin based pre-treatment systems. Discuss this with your pre-treatment supplier.
Aluminium should be degreased to remove lubricants and processing soaps. For most purposes no further treatment is necessary. However for maximum long term corrosion resistance chromate treatment is recommended.
Coating Conditions: When the powder is applied using a Corona Discharge gun a negative polarity is required. A voltage of 30-50 KV or 10-20 microamps is recommended. Plascoat PPA 571 ES can also be applied by Tribocharge guns. The heating schedule should be 160°C to 220°C for 5-40 mins depending on metal thickness. To ensure optimum adhesion, the metal temperature during processing must exceed 150°C. Since Plascoat PPA 571 ES is a thermoplastic there is no cross-linking to take place. Therefore when the powder has melted to form a smooth coating no further heating is required.
Overheating can cause craters to form in the coating or the coating to reduce gloss. It may also cause the coating to discolour in storage or in service. Thicknesses outside the recommended range may be detrimental to the properties of the coating.
Do not cure thermosetting powder paints with PPA 571 ES. The fumes from such systems can affect the surface of the PPA 571 ES coatings.
Note: If PPA 571 ES over-sprayed powder is to be recycled, then blend a maximum of 25% of this over-sprayed powder with 75% unused powder.
For typical properties of the coating see below.
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TYPICAL PROPERTIES OF THE POWDER
TYPICAL PROPERTIES OF THE MATERIAL
*These values may vary from colour to colour
STORAGE Stored in a clean dry area at 10-25°C and out of sunlight, the material should not deteriorate. However, in the interest of good housekeeping, old stocks should be used first. HEALTH AND SAFETY Plascoat PPA 571 ES is supplied as a finely
divided powder. Whilst there are no
known health hazards associated with PPA 571 ES, normal
handling precautions for dealing with fine organic powders should
be taken - i.e. excessive dust generation and inhaling of the powder
should be avoided. Facilities may be required for removing excess dust
from the working area during the coating of certain difficult
items. As with all polymeric powders, the material
can ignite if brought into contact with
a high temperature source or ignition - particularly in the fluidised
condition. Reference should be made to Plascoat Health
and Safety Data Sheet
HS504, available
on request. Should the coating be required for contact
with
food or potable water, further
details should be obtained from
Plascoat.
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TYPICAL PROPERTIES OF THE COATING
The following data applies to a 200 micron coating applied under standard conditions onto 3mm thick steel or aluminium. The pretreatment consisted of degreasing and gritblasting unless otherwise stated.
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Recommended Coating Thickness |
170-300 microns |
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Appearance |
Smooth/Glossy |
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Gloss |
ISO 2813 |
70 |
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Impact Strength
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Gardner (drop weight) ISO 6272 Direct 23°C (3mm plate) Indirect 0°C (3mm plate)
Gardner (drop weight) ISO 6272 Direct 23°C (0.7mm plate) Indirect 0°C (0.7mm plate) |
2.7 Joules 18.0 Joules
> 27 Joules > 27 Joules |
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Abrasion |
Taber ASTM D4060/84 H18, 500g load, 1000 cycles |
60 mg weight loss |
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Salt Spray
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ISO 7253 Steel - Scribed
- Unscribed Aluminium - Scribed - Unscribed |
Results after 1000 hours Loss of adhesion less than 10mm from scribe. Under film corrosion 2-3mm No loss of adhesion No loss of adhesion No loss of adhesion |
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Chemical Resistance*
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- Dilute Acids 60°C - Dilute Alkali 60°C - Salts (except peroxides) 60°C - Solvents 23°C |
Good Good Good Poor |
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Adhesion |
PSL, TM 19 |
A-1 |
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Weathering
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QUV ASTM G53-77
Florida 45° facing South |
2000 hrs - No significant change in colour or loss of gloss. 3 years - No significant change in colour or loss of gloss. |
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Ignitability
Surface spread of flame
Fire Propagation
Flammability |
BS476: Pt5: 1979 500 micron coating BS476: Pt7: 1979 500 micron coating BS476: Pt6: 1989 500 micron coating UL94 |
P - not easily ignitable
Class 1
I = 0.2
Vo (see also Properties of Material) |
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Safe Working Temperature |
(Continuous in air) |
60°C max |
*Further technical advice may be obtained from Plascoat concerning the effects of particular chemicals or mixtures.
| QUALITY
Plascoat is committed to the manufacture and supply of a wide range of thermoplastic coating powders. This service is backed by the unrivalled experience of over 50 years of powder coating application.
With a policy of continuous improvement to its range of products, Plascoat reserves the right to alter or amend any item. Stringent quality control procedures are carried out at every relevant stage of manufacture and Plascoat operates a quality management system approved by BSI in accordance with ISO 9001:2000. |
Plascoat
can also offer, through its factories in Europe, specialist
plastic coating equipment, an extensive
custom coating service
and a size reduction service for plastics and other materials.
Plascoat is a subsidiary member of the IPT Group of companies.
Plascoat is a UK registered trade name.
It should be appreciated that the information given here is, to the best of our knowledge, true and accurate. However, since conditions under which our materials and equipment may be used are beyond our control, recommendations are made without warranty or guarantee. |
Independent report for insurance-based guarantee for PPA 571ES coated items
| Plascoat Systems Limited Trading Estate, Farnham, Surrey, GU9 9NY United Kingdom Tel: +44 (0) 1252 733777 Fax: +44 (0) 1252 721250 email: sales@plascoat.com |
Plascoat Europe BV Kerkweg 11, Postbus 9 3214ZG Zuidland The Netherlands Tel:+31 (0) 181 458 888 Fax:+31 (0) 181 458 877 salespce@plascoat.nl |
Plascoat Corp Crown Centre Suite 600 5005 Rockside Rd Cleveland OH44131 U.S.A. Tel: 800 489 7236 Fax:+1 216 520 1273 plascoat@nls.net |
Plascoat Corp (Sales & Dist) Punda Mercantile Inc 4115 Sherbrooke Str West, Suite 610, Montreal, Quebec H3Z 1K9 Call: 800 489 7236 Tel: +1 514 931 7278 Fax: +1 514 931 7200 sales@punda.com |
PPA571ES/03/09/07 /Web