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Durability

These tests are designed to measure the effect of sunlight, moisture and temperature on surface coatings applied to a variety of substrates. If you are more concerned with the way that surface coatings protect substrates from corrosion, please refer to our Corrosion Resistance tests.

The BS and ASTM standards mentioned here are copyright-protected documents and we are not able to provide you with copies. If required however, you can easily obtain copies from the British Standards Institution or the American Society for Testing and Materials.

Test Standard
Artificial Weathering using a Fluorescent Lamp SourceASTM D 4587
Artificial Weathering using a Fluorescent Lamp SourceASTM G154
Artificial Weathering using a Fluorescent Lamp SourceBS EN ISO 11507, BS 3900-F16
Artificial Weathering using a Xenon Arc SourceBS EN ISO 11341
Artificial Weathering using a Xenon Arc SourceISO 12040
Assessment of Lightfastness
Controlled Temperature and Humidity Exposure
Natural WeatheringBS EN ISO 2810
Resistance to Temperature ChangeASTM D1211

Artificial Weathering using a Fluorescent Lamp Source: ASTM D 4587

Scope and Field Application

This is a method for determining the resistance of materials to artificial weathering and deals with the testing of paint and related coatings

There are no pass/fail criteria defined in the standards. This is a matter of agreement between the parties concerned.


 

Sample Requirements

Ideally we require 150 x 75 mm panels not more that 5 mm thick, although we can accommodate a limited number of 150 x 100 mm panels provided they are less than 5 mm thick. If you have smaller samples you can fix them to 150 x 75 mm panels provided the overall thickness does not exceed 5 mm.

We recommend running samples in triplicate.

If you wish, we can prepare the test panels. The quantity of liquid paint we needs depends on the method of application. We will be pleased to advise you regarding our requirements.

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Artificial Weathering using a Fluorescent Lamp Source: ASTM G154

Scope and Field Application

This is a method for determining the resistance of materials to artificial weathering and deals with the testing of non-metallic materials. This means the standard can be used both for paints and other organic materials such as polymers.

Like all laboratory tests, there are advantages and limitations to weathering under artificial conditions. The test method is relatively cheap and simple to carry out however, the fluorescent lamps defined by the standards are not a good approximations to natural sunlight. The difference is greatest at wavelengths above 350 nm.

There are no pass/fail criteria defined in the standards. This is a matter of agreement between the parties concerned.

Sample Requirements

Ideally we require 150 x 75 mm panels not more that 5 mm thick, although we can accommodate a limited number of 150 x 100 mm panels provided they are less than 5 mm thick. If you have smaller samples you can fix them to 150 x 75 mm panels provided the overall thickness does not exceed 5 mm.

We recommend running samples in triplicate.

If you wish, we can prepare the test panels. The quantity of liquid paint we needs depends on the method of application. We will be pleased to advise you regarding our requirements.


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Artificial Weathering using a Fluorescent Lamp Source: BS EN ISO 11507, BS 3900-F16

Scope and Field Application

BS EN ISO 11507 and BS 3900-F16 are alternative names for the same method which deals with determining the resistance of paint and related coatings to artificial weathering.

There are no pass/fail criteria defined in the standards. This is a matter of agreement between the parties concerned.

 

Sample Requirements

Ideally we require 150 x 75 mm panels not more that 5 mm thick, although we can accommodate a limited number of 150 x 100 mm panels provided they are less than 5 mm thick. If you have smaller samples you can fix them to 150 x 75 mm panels provided the overall thickness does not exceed 5 mm.

We recommend running samples in triplicate.

If you wish, we can prepare the test panels. The quantity of liquid paint we needs depends on the method of application. We will be pleased to advise you regarding our requirements.


 

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Artificial Weathering using a Xenon Arc Source: BS EN ISO 11341

Scope and Field Application

BS EN ISO 11341 is a method of determining either the lightfastness of paint films and allied materials or their resistance to artificial weathering. It aims to replicate the degradation caused by sunlight (either direct or through window glass) and rainfall.

The xenon arc source, when used in conjunction with appropriate filters, is generally regarded as giving the closest approximation to natural sunlight that can be obtained in the laboratory. The equipment also allows for a greater degree of control of temperature, humidity and radiation dose than is possible with other forms of accelerated weathering. This is one of the most expensive weathering tests and is limited to test samples that are flat.

An alternative and less expensive method of measuring lightfastness involves the use of a fluorescent lamp weatherometer. Please refer to lightfastness test method for details.

There are no pass/fail criteria defined in the standard. This is a matter of agreement between the parties concerned.


Sample Requirements

We require 150 x 75 mm samples not more that 5 mm thick. If you have smaller samples, you can fix them to 150 x 75 mm panels provided the overall thickness does not exceed 5 mm.

 

We recommend that samples are run in triplicate.


 

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Artificial Weathering using a Xenon Arc Source: ISO 12040

Scope and Field Application

ISO 12040 is a method similar to BS EN ISO 11341 but is used for determining the lightfastness of printed material, printing inks and substrates (paper, board, metal and plastic) used in printing processes

There are no pass/fail criteria defined in the standard. This is a matter of agreement between the parties concerned.


Sample Requirements

We require 150 x 75 mm samples not more than 5 mm thick. If you have smaller samples, you can fix them to 150 x 75 mm panels provided the overall thickness does not exceed 5 mm.

We recommend that samples are run in triplicate.


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Assessment of Lightfastness:

Scope and Field Application

Lightfastness is a term used to describe the resistance of a material to colour change when exposed to sunlight or to artificial light sources. When paints are exposed outdoors they generally become less glossy and more prone to cracking and flaking; they may also show colour changes or fading. Paints exposed indoors to sunlight that has passed through window glass generally degrade less rapidly the reasons being that they are not exposed to rainfall nor to the ultraviolet region of the solar spectrum ( glass does not transmit very much UV radiation).

In addition to paints, we can test other coloured items including printed material, textiles and plastics and these can be exposed directly to the light source or tested behind glass.


Sample Requirements

Ideally 150 x 75 mm panels not more that 5 mm thick, although we can accommodate a limited number of 150 x 100 mm panels provided they are less than 5 mm thick. If you have smaller samples you can fix them to 150 x 75 mm panels provided the overall thickness does not exceed 5 mm.

We recommend that samples are run in triplicate.

If you wish, we can prepare the test panels. The quantity of liquid paint we need depends on the method of application. We will be pleased to advise you regarding our requirements.


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Controlled Temperature and Humidity Exposure:

Scope and Field Application

This method can be used to give an indication of how well a painted surface will resist a wide range of temperature/humidity conditions. If you are particularly interested in resistance to exposure to warm humid conditions, please refer to the Resistance to Humidity tests on the Corrosion Resistance page. Coatings intended to resist prolonged contact with water can be tested using our Resistance to Liquids tests described at Mechanical Properties.

Sample Requirements

The chamber dimensions are 80 x 80 x 86 cm and we can accommodate any number of samples that will fit within this chamber provided that their total weight does not exceed 20 Kg.

We recommend that samples are run in triplicate.

If you wish, we can prepare the test panels. The quantity of liquid paint we need depends on the method of application. We will be pleased to advise you regarding our requirements.


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Natural Weathering: BS EN ISO 2810

Scope and Field Application

Natural weathering of paints and similar materials involves exposing test panels outdoors at appropriate locations. These locations can be chosen on the basis of climate ( eg tropical, temperate, desert ) or on the basis of atmospheric pollution ( eg rural, industrial, marine).

Natural weathering has the single important advantage that, for a given location, it provides the most reliable data on how a coating will perform in service. However If the coatings under test are highly durable, it can take years to obtain sufficient degradation to enable them to be differentiated and as no two years are the same consequently you can never reproduce the results you obtain.

BS EN ISO 2810 is essentially a guidance note for the conduct of natural weathering tests. There are no pass/fail criteria defined in the standard. This is a matter of agreement between the parties concerned.


Sample Requirements

BS EN ISO 2810 requires that each test panel shall have an area of at least 300 square cm and that no side should be less than 10 cm in length. We normally use 10 x 30 or 15 x 20 cm panels (4 x 12 or 6 x 8 inch). We recommend that panels should be exposed in triplicate together with extra panels, if required, to allow for any destructive testing.

 

If you wish, we can prepare the test panels. The quantity of liquid paint we need depends on the method of application. We will be pleased to advise you regarding our requirements.

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Resistance to Temperature Change: ASTM D1211

Scope and Field Application

ASTM D1211 is a method of determining the resistance to cracking of clear nitrocellulose lacquer films applied to wood or plywood substrates and subjected to sudden changes from high to low temperature. We can test to this standard or we can use it as a basis for tests involving different coatings and substrates.

If you are concerned with the resistance of liquid coatings to changes in temperature then please refer to the Freeze-Thaw test described at Testing Paints Before Application.

There are no pass/fail criteria defined in the standard. This is a matter of agreement between the parties concerned.


Sample Requirements

The panels defined in the standard are 300 x 150 x 8 mm cut from plywood. We can test panels of this size (or smaller) cut from any substrate. At least 3 panels are required for each coating.

If you wish, we can prepare the test panels. The quantity of liquid paint we need depends on the method of application. We will be pleased to advise you regarding our requirements.

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Coatings News

Press Release Nov 17

9th November 2017

PRA granted UKAS accreditation

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Irfab releases first Global Industrial Coatings Market study module - Protective

23rd January 2017

PRA Irfab have released the first module of the new Global Industrial Coatings Market study, Protective.

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Woodcoatings Congress Proceedings

11th January 2017

Did you miss PRA’s 10th International Woodcoatings Congress? You can now buy a copy of the full proceedings and papers from the European Coatings Website!

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Christmas Shutdown

21st December 2016

We will be closed between Saturday 24th December 2016 and Monday 2nd January 2017.

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PRA Newsletter

7th December 2016

Click on the link to view PRA's new quarterly Newsletter

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PRA Press Release November 2016

30th November 2016

Notice of Management Buyout of PRA from Pera Technology Solutions

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Welcome to new Member Olin Epoxy!

21st October 2016

Welcome to our newest member - Olin Epoxy!

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Welcome to M&K Ghana

28th September 2016

PRA are pleased to welcome M&K Ghana to membership.

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Welcome to our new Member Synthomer

14th September 2016

Welcome back to PRA Synthomer!

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Welcome Dupre Minerals to PRA

28th July 2016

PRA is delighted to welcome another new member to the PRA - Dupre Minerals

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Autumn/Winter Training Courses Announced

22nd July 2016

PRA is delighted to preview its Autumn/Winter Training Courses for 2016.

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Coatings Events

CEPE Annual Conference + General Assembly 2018

26th September 2018 - 28th September 2018
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Woodcoatings Congress 2018

23rd October 2018 - 24th October 2018
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