Test Background
Scratches refer to defects that exist on the surface of the coating and extend to a certain area around the coating, forming flaws that are visible to the naked eye due to different light reflection properties from adjacent areas. The scratch resistance test of paints and varnishes can be performed with an arc-shaped (annular or annular) scratch needle to determine the scratch resistance of a single coating of paint, varnish or related products, or the topcoat of a composite coating.
Zhongke Testing Reliability Experiment Center has the capability of reliability testing of various paints and varnishes, and provides professional scratch resistance test services for paints and varnishes.
Scope of tests
Color paint is divided into primer and topcoat: primer is divided into primer, putty, mid-coat, sealer, anti-rust paint, etc.; topcoat is divided into enamel paint, special topcoat, etc.
The paint and film of varnish are transparent and are divided into ester varnish, shellac varnish, phenolic varnish, alkyd varnish, acrylic varnish, polyester varnish, high-performance varnish, fluorocarbon varnish, etc.
Test method
1. Apply the product or system under test with uniform thickness on a flat test plate with uniform surface texture.
2. After drying/curing, the scratch resistance is measured by pushing the test panel under an arc-shaped (annular or donut-shaped) scratching needle. The scratching needle is installed to press down on the surface of the test panel at 45°, and the load on the test panel is continuously increased until the coating is scratched.
Test standard:
GB/T 31591-2015 Paints and varnishes - Determination of scratch resistance
ISO 12137-2011 Paints and varnishes Determination of scratch resistance
EN ISO 12137-2011 Paints and varnishes Determination of scratch resistance
BS EN ISO 12137-2011 Paints and varnishes Determination of scratch resistance
DIN EN ISO 12137-2011 Paints and varnishes Determination of scratch resistance
NF EN ISO 12137-2011 Paints and varnishes Determination of scratch resistance
