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Determination of Resistance to LiquidsBS EN ISO 2812-1
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Scope and Field of Application
These are all methods for determining the resistance of paints, varnishes and other coating materials to liquids. The methods differ in the nature of the liquid used and the mode of contact between the liquid and the material under test.
BS EN ISO 2812-1 is a method of determining the resistance of
coatings to immersion in liquids other than water.
BS EN ISO 2812-2 is a method of determining the resistance of
coatings to immersion in water.
BS EN ISO 2812-3 is a method of determining the resistance of
coatings to contact with an absorbent medium impregnated with
liquid.
BS EN ISO 2812-4 is a method of determining the resistance of
coatings to contact with droplets of liquid.
There are no pass/fail criteria defined in these standards. These are matters of agreement between the parties concerned.
The actual standards 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.
Summary of Methods
BS EN ISO 2812-1
The standard contains an annex that lists examples of liquids in which the test pieces can be immersed. These include automotive fuels and fluids as well as a selection of organic solvents, acids and bases.
The tests pieces may be in the form of panels or rods. Rods are used to eliminate edge effects.
The temperature of the liquid, the depth of immersion of the test pieces and the time of contact are all matters of agreement between the parties concerned.
BS EN ISO 2812-2
This is a similar immersion standard to BS EN ISO 2812-1. The main differences are that it relates solely to water immersion and panels are the only test pieces specified.
BS EN ISO 2812-3
The standard contains an annex that lists examples of test liquids. These include the ones listed in BS EN ISO 2821-1 together with a number of viscous or paste-like materials designed to mimic those exuded by plants and animals and which can damage automotive finishes. The most notable of these is a simulated bird dropping mixture based on pancreatin.
Panels are the only test pieces specified. The liquids are used to impregnate cotton wool or filter paper which is then held in contact with the test piece. The time of contact and the temperature are matters of agreement between the parties concerned.
BS EN ISO 2812-4
This is essentially the same method as BS EN ISO 2812-3. The same test liquids are suggested and the main difference is that they are applied to the test piece as droplets rather than impregnated absorbent material.
Sample Requirements
We require three test panels each 150 x 100 mm for each coating to be tested.
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.
Accreditation
PRA is accredited to ISO 17025 by the United Kingdom Accreditation Service (UKAS) to carry out these tests.
Please contact Peter Collins for further details.
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