Fluid Resistance.
Fluid resistance testing of coatings evaluates the resistance of an individual-layer or multi-layer system of coating materials to the effects of liquids. This could be by various exposure methods such as immersion, swabbing or wet patch using an absorbent material.
Fluid Resistance testing allows us to determine the effects of the test liquid on the coating and if necessary, to assess the damage to the substrate. Exposure to fluids is particularly important to determine a products or coatings suitability to its intended purpose, where test fluids used are generally those experienced during the products life in service.
An example of fluids tested are: water, petrol, car wash solution on e-coated panels.
Testing specifications include:
- ISO 2812-1/2/3 – determination of resistance to liquids.
- ASTM D870 – standard practice for testing water resistance of coatings using water immersion.
Evaluations include:
- ISO 2813- Paints and varnishes — Determination of gloss value at 20°, 60° and 85°
- ASTM D523- Standard Test Method for Specular Gloss.
- ISO 105-A02- test for colour fastness – grey scale for assessing change in colour.
- ISO 4628-2 Assessment of degree of blistering.
- ISO 4628-4 Assessment of degree of cracking.
- ISO 4628-5 Assessment of degree of flaking.
- ISO 4628-6 Assessment of degree of chalking by tape method.
