Overview
The JFL QBY-II automatic counting pendulum hardness gauge is a special instrument for the determination of the Hardness of paints. The test technology is characterized by the fact that Hardness is expressed in the ratio of the time required for the pendulum to swing in a specified amplitude on the paint film to the time required for the same amplitude on the Glass plate.
Features
Adopting a counter-pendulum design, it meets the GB/T 1730-93 (B method) standard.
2. Equipped with automatic counting function, the timing range can reach 999.9 seconds.
3. The swing rod mass is 120 grams to ensure the Stability and Accuracy of the test.
The base swing time on a standard Glass plate is 440 +/- 6 seconds.
Principle
The hardness gauge by measuring the swinging rod in the film sample surface from 5 degrees to 2 degrees of the swinging time required within a predetermined amplitude, and compared with the swinging rod to complete the same amplitude swinging time required on a standard Glass plate, the calculated time ratio of the two, in order to quantify the characterization of the film Hardness.
Applications
Determination of Paint Film Hardness
Standards
GB/T 1730-93 (B method)
Steps
1. Place the instrument on a stable bench.
2. Place the standard Glass plate in the test position and calibrate the reference time (make sure the swing time is 440 +/- 6 seconds).
3. Place the sample of the paint film to be tested in the test position.
4. Start the swing rod to swing freely on the sample surface at a specified amplitude (5 degrees to 2 degrees).
5. The instrument automatically records the time required for the swing rod to swing at a specified amplitude on the sample.
6. Calculate the Hardness Ratio from the measured time to the reference time on the Glass.
Notice
• Before use, ensure that the instrument is placed horizontally on a stable platform.
• The swing time must be calibrated with a standard Glass plate before testing.
• The surface of the tested paint film sample should be flat, clean and drying.
• During the falling and swinging of the swing rod, human touch or external force should be avoided.
• Pay attention to the maintenance of the instrument to avoid impact or contamination of precision components such as swing rods.
