The mar resistance test for coatings is very similar to the scratch resistance test. However, this test uses an arc-shaped (loop or ring-shaped) stylus to assess the mar resistance of a single coating layer, paint, varnish, related product, or the upper layer of a multi-coat system
The product or system under test is applied at a uniform thickness to flat panels with a consistent surface texture. After drying or curing, mar resistance is determined by pushing the panel beneath a curved (loop- or ring-shaped) stylus, which is mounted to press on the panel surface at a 45° angle. The load on the test panel is increased stepwise until the coating is marred
This test is useful for comparing the mar resistance of different coatings and is particularly effective at providing relative ratings for a series of coated panels with significant differences in mar resistance
Please note: this test does not specify a method using a pointed stylus (as per ISO 1518-1 and ISO 1518-2). The choice among these three methods depends on your specific requirements
Standards
ISO 12137-2011
ASTM D 2197
ASTM D 5178
Technical Specification
Adjustable working speed: 3 mm/s – 10 mm/s
Double-adjusting balance device to reduce test errors due to unevenness
Movable working table allows testing multiple areas on the same test panel
Liftable balance arm enables mar testing of panels with thicknesses from 0 mm to 12 mm
Main Technical Parameters
Motor Power
15W
Working distance
80 mm
Weights
1 x 100g; 2 x 200g; 1 x 500g; 2 x 1000g; 1 x 2000g
Ring Shaped Stylus
Diameter 6.5 ± 0.1 mm, R0.8 ± 0.02 mm, Thickness 1.6 ± 0.02 mm; smooth surface with Rockwell hardness HRC56–HRC58, surface roughness ≤ 0.05 μm
Stylus moving speed
3mm/s~10 mm/s (steps of 0.05 mm/s)
Angle between stylus and test panels
45º
Test Panel Width
40mm~110mm
Test Panel Thickness
0~12 mm
Power
Input 110~240V AC 50/60Hz (Power adapter output 24V, 2A)
Dimensions
540mmx250mm x 375 mm (L x W x H)
Ordering Information: BGD 536 Mar Resistance Tester
