Overview
The ERICHSEN erichsen 318 (0.75mm) Hardness test bar is a precision instrument for the measurement of protective coating Hardness. The spring stress testing principle is used to accurately measure the Hardness of paint and plastic coatings. It is suitable for flat or curved test surfaces without size restrictions.
Features
Three pressure ranges are available: 0-3N (marked in blue), 0-10N (marked in red), and 0-20N (marked in yellow).
2. The test head is made of tungsten carbide material, diameter 0.75mm
3. The pressure spring is made of spring steel
4. Portable design, length 160mm, diameter 16mm, Net weight about 250g
5. Special Encasement Box for Protection
Principle
By setting the slider to estimate or know the spring pressure, place the Hardness test rod vertically on the test surface and draw a straight line of 5~ 10mm at a speed of 10mm/sec. The test head will produce a visible scratch. Determine whether the spring pressure is appropriate by observing the clarity of the scratch: the scratch is clear when the pressure is too high, and no scratch appears when the pressure is too low. The required pressure can be precisely controlled by locking the slider, in Newtons.
Applications
Paint film hardness testing, plastic coating hardness testing, protective coating Hardness measurement
Steps
1. Estimated or known spring pressure via slider setting
2. Place the Hardness Test Rod vertically on the test surface
3. Draw a straight line of 5 to 10mm at a speed of 10mm/sec
4. Observation of scratch clarity
5. Adjust the spring pressure setting according to the scratch situation
Notice
• Loosen the nut after use, remove the scale pen, and clean the rod and hole with a soft cloth
• The test head cannot withstand a lot of impulse and needs to be properly protected
• When not in use, the slider should be set at zero to protect spring Accuracy
• Instruments should be stored in a dedicated Encasement
• Keep the instrument clean to ensure accurate test results
