Coating Scratch Resistance Tester

The Coating Scratch Resistance Tester is used to evaluate the scratch resistance of coatings. It is similar to conventional coating scratch tests, but this method uses an arc-shaped (ring or circular) stylus to measure the scratch resistance of single or composite coatings, including color paints, clear coatings, or related products.

Testing Method

The test material or coating system is applied to a smooth test panel with a uniform surface texture at a consistent thickness. After drying or curing, the scratch resistance is determined by moving the test panel under the arc-shaped (ring or circular) stylus. The stylus is mounted at a 45° angle to the panel surface, and the applied load is gradually increased until the coating is scratched. The minimum load causing coating damage is taken as the load that produces scratching in at least 2 out of 5 measurements.

Standard

GB/T 31591-2015: Methods for Determining the Scratch Resistance of Color and Clear Coatings

Application

Evaluate scratch resistance and surface durability of paints, varnishes, and protective coatings.

Test coatings used in automotive, aerospace, construction, and industrial applications.

Support quality control, product development, and compliance with industry standards.

Simulate real-world mechanical abrasion to assess coating performance and longevity.

Features

Movable work platform allows users to quickly switch between different test areas on the same panel.

Extra-large platform accommodates test panels of various sizes (maximum 200 mm × 100 mm).

Adjustable balance arm allows scratch testing of panels with different thicknesses (0–12 mm).

Technical Parameters

Accessories

(1)Scratch Stylus/Needles: Various tips for different scratch hardness and shapes.

(2)Sample Holders/Clamps: Secure coated panels during testing.

(3)Load Weights: Standardized weights to apply controlled pressure.

(4)Control Unit: Adjusts speed, force, and test parameters.

Test Procedures

Sample Preparation: Apply coatings on standard panels and allow proper curing.

Scratch Testing: Move stylus across the surface under controlled load and speed.

Observation: Inspect scratches visually or with microscopy to assess coating damage.

Data Recording: Measure scratch width, depth, or critical failure load for evaluation.

Maintenance Information

Daily Cleaning: Wipe stylus, holders, and sample platform after each test.

Calibration: Regularly check force application and speed controls.

Inspection: Examine stylus tips and replace if worn or damaged.

Storage: Keep the machine in a clean, dry, and dust-free environment.

FAQ

1. What is the purpose of this tester?

It evaluates the scratch resistance and surface durability of coatings to ensure long-term performance and protection.

2. Which coatings can be tested?

Applicable to paints, varnishes, lacquers, and industrial protective coatings across automotive, aerospace, and construction sectors.

3. How is a scratch test performed?

A stylus or needle moves across the coated surface under controlled load and speed, and scratches are evaluated for width, depth, or failure point.

4. What standards does this tester comply with?

Supports industry standards such as ISO 1518. ASTM D7027. and other relevant coating scratch-resistance protocols.

5. How should the tester be maintained?

Clean stylus tips and sample holders after each test, calibrate load and speed settings regularly, inspect for wear, and store in a dust-free environment.