Test Background
The paint and varnish bend test evaluates the resistance of coatings of paints, varnishes or related products to cracking or peeling from the substrate when bent around a tapered axis under standard conditions; for multi-coat systems, each coating can be tested separately or the entire coating system can be tested.
Zhongke Testing Reliability Experiment Center has the capability of reliability testing of various paints and varnishes, and provides professional bending 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. Use a 10x magnifying glass under sufficient lighting conditions to immediately check for cracks or peeling of the coating from the substrate. Alternatively, it can be observed with the naked eye upon agreement.
2. Measure the distance from the thin end of the shaft to the last visible crack along the test plate to indicate the length of the cracking range on the test plate, measured in mm. Calculate the average of three determinations and report the results to the nearest mm.
Test standard:
GB/T 11185-2009 Paints and varnishes - Bending test (tapered shaft)
ISO 6860: 2006 Paints and varnishes Bending test (tapered shaft)
DIN EN ISO 6860: 2006 Paints and varnishes Bending test (tapered shaft)
BS EN ISO 6860: 2006 Paints and varnishes Bending test (tapered shaft)
EN ISO 6860: 2006 Paints and varnishes Bending test (tapered shaft)
NF EN ISO 6860: 2006 Paints and varnishes Bending test (tapered shaft)
