Overview
The QHQ Benchtop Pencil hardness tester is a precision instrument for evaluating coating Hardness. It uses the principle of pencil Hardness Experiment (Wolff-Wilborn Experiment) to test films at fixed angles and pressures with graphite pencils with different Hardness values. The instrument is precisely designed to ensure accurate and reliable test results, and is widely used in Coating performance evaluation.
Features
1. Precision design ensures that the pencil lead maintains a 45 ° angle and a fixed pressure; 2. Adopts a four-link mechanism to ensure that the Nominal Mass acts vertically on the test point; 3. The test bench can be moved vertically for easy operation; 4. Equipped with a variety of Hardness pencils, covering the range of 6B to 6H; 5. Compact structure and easy operation.
Principle
The instrument consists of a pencil holder and a test bench. The pencil holder and the column form a four-bar linkage mechanism, so that the Nominal Mass acts vertically on the intersection of the pencil lead and the test bench, and maintains the 45 ° included angle unchanged. The test bench fixes the Coating sample and moves vertically. The pencil draws a trajectory on the test piece, and the film Hardness value is determined by scratching with different pencils.
Applications
Film hardness testing, Coating performance evaluation, abrasion resistance evaluation, abrasion resistance test, scratch resistance analysis, impact resistance evaluation
Standards
GB/T 6739 Paints and varnishes - Determination of Paint Film Hardness by Pencil Method
Steps
1. Fix the Coating sample on the test bench; 2. Select the appropriate Hardness pencil to install on the pencil holder; 3. Adjust the instrument angle and pressure settings; 4. Start the test bench to move vertically; 5. Observe the pencil scratching on the test strip; 6. Determine the film Hardness grade according to the minimum Hardness value pencil mark.
Notice
• Ensure that the pencil lead remains intact to avoid breakage affecting the test; • Check whether the components of the instrument are tight before operation; • Keep the environment stable during the test to avoid external interference; • Clean the instrument after use to prevent residues from affecting the accuracy; • Strictly follow the instructions to avoid overloading.
