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Paint Performance Testing:Exterior Wood Coatings |
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Introduction
The tests listed below relate to clear, semi-transparent and opaque coatings applied on-site to exterior joinery. The assessment of other coatings applied to exterior woodwork is described on our Shed / Fence and Decking pages.
Method of Testing and Assessment
The table shows the tests carried out. The links will take you to pages which give details of the test methods.
| Test | Standard |
|---|---|
| In Can Properties | BS 3900-A2 : ISO 1513 |
| Application Properties, Appearance and Coverage | In-House |
| Surface Drying Time | BS 3900-C2 : ISO 1517 |
| Through Drying Time | BS 3900-C3 : ISO 9117: BS EN 29117 |
| Recoatability | In House |
| 1,000 hours Accelerated Weathering | ASTM G154a |
| Gloss/Sheen (before and after accelerated weathering) | BS EN ISO 2813: BS 3900-D5 |
| Visual Colour Comparison (before and after accelerated weathering) | BS EN ISO 3668 : BS 3900-D1 |
| Adhesion (after accelerated weathering) | BS EN ISO 2409: BS 3900-E6 |
| Flexibility (after accelerated weathering) | BS EN ISO 6860 : BS 3900-E11 |
| Fungal Resistance (after accelerated weathering) | BS 3900-G6 |
We do not set our own pass/fail criteria so we offer the following options:-
Option 1: Client Assessment
This option is available to clients who are happy to make their own interpretation of the test results. They can submit one or more coatings with or without a reference coating.
Option 2: PRA Assessment
This option is appropriate for clients who would like us to comment on the significance of the test results and to give our opinion on the performance of the coatings tested. Experience has shown that the most effective way that we can do this is:-
- we obtain a premium brand coating of the same type as the one under test. Our report does not identify the actual coating obtained.
- we test both coatings.
- we issue a report which give the results obtained from both coatings and which includes our opinion of the quality of the coating under test.
You can include additional coatings for comparison with the reference coating or with each other.
Clients can submit their own reference coating but if they provide one which they do not make or market, we ask that they re-label it as (for example) "Sample X". We do not issue reports containing the names of coatings unless they are made or marketed by the client.
On completion of the tests, we issue a report which give the results obtained and (if you have requested that option) our opinion of the quality of the coatings under test.
Further Details
Please contact Peter Collins for pricing, sample requirements and timescales