Mechanical Scratch Tester
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The Mechanical Scratch Tester is a mechanically driven instrument designed for evaluating coating hardness based on scratch resistance performance. During testing, the coated panel is clamped and moved at a controlled constant speed while a spherical stylus or alternative scratching tool is pressed against the surface under a defined load. By applying either fixed or variable loads, the system can generate different levels of coating damage ranging from visible marks to complete film failure. An integrated voltmeter detects electrical contact between the stylus and the metallic substrate, enabling clear determination of coating breakthrough. The tester is suitable for standard metal panels up to 100 × 150 × 1.6 mm with a coating thickness of up to 0.3 mm.
Application
Primary test purposes
Coating scratch resistance evaluation
Coating hardness assessment based on mechanical damage behavior
Determination of coating failure load
Detection of coating breakthrough on conductive substrates
Typical tested materials
Painted metal panels
Industrial coatings
Automotive coatings
Protective and functional coatings on metal substrates
Laboratory standard test panels
Standards
(1) GB/T 23989-2009 – Determination of scratch resistance of coatings
(2) GB/T 5210-2006 – Paints and varnishes – Pull-off adhesion test
(3) GB/T 1768-2006 – Determination of abrasion resistance of paint films
(4) ISO 1518-1 – Paints and varnishes – Scratch test – Part 1: Determination of scratch resistance
(5) ISO 20502 – Coating materials – Scratch test
(6) ASTM C1624 – Standard test method for adhesion and scratch resistance of ceramic and hard coatings
(7) DIN EN 1071-3 – Advanced technical ceramics – Mechanical properties of ceramic coatings – Part 3: Scratch testing
Parameters
| Parameter | Specification |
|---|---|
| Stylus moving speed | 35 mm/s |
| Maximum panel size | 100 × 150 × 1.6 mm |
| Maximum coating thickness | 0.3 mm |
| Applicable standard setting | ISO 1518-1 |
| Standard test load | 20 N |
| Power supply | 230 VAC, 50 Hz |
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