The film hardness test was carried out by plowing the pencil hardness level of the paint film. The hardness of the coating film is a necessary measure for quality certification in the coating and coating (painting) industries. The pencil scratch test method is a method commonly used by the international community since the 1980s. China has also promoted this test method in the development of coatings and industrial production. The instrument is designed and manufactured according to the national standard "film hardness pencil method" GB/T6739-1996. The instrument can be used in the laboratory or on the construction site and can be used to verify the hardness of the film in any direction.
QHQ paint film scratch pencil hardness tester pencil hardness tester technical parameters:
Load: 1000+/-1g
Executive standard: GB/T6739-86 / JIS K5401 / ASTMD2197
Angle between pencil and sample: 45 degrees
Pencil size: 6H-6B (a total of 13 Zhonghua brand pencils)
Technical characteristics: The hardness is expressed by the pencil hardness level of the plowed paint film under the specified test conditions; the test stand is movable. The hardness is expressed by the pencil hardness level of the plowed paint film under the specified test conditions.
QHQ paint film scratch pencil hardness tester pencil hardness tester working principle
The instrument is mainly composed of a pencil stand and a test stand, and the pencil stand and the column form a four-link structure, which ensures that the weight of the weight acts perpendicularly on the intersection of the pencil lead and the test stand, and the pencil and the test stand are at 45°. Angle and stay the same. The test bench can be moved horizontally and vertically, and the paint sample is fixed by the test plate, and the sample plate is slid toward the scratch direction, and the pencil draws a corresponding trajectory on the test piece. Use different pencils to draw different marks, and then judge the hardness value of the film. Pencil hardness tester QHQ-A coating hardness coating manufacturing coating use (coating table) industry portable pencil scratch tester.
QHQ paint film scratch pencil hardness test procedure:
◠Use a pencil sharpener to cut the pencil to expose the 4-6mm cylindrical refill (do not loose or scratch the refill), hold the pencil perpendicular to the 400# sandpaper surface, and grind it on the sandpaper until the end surface is flat. The edge of the sharp edge of the pen (the edge must not be broken or notched), the pencil should be rotated 180° after use, and then used or regrind.
â— Manual operation procedure:
Fix the specimen on the surface of the water platform, hold the sharpened pencil at an angle of 45° to the coating, and push forward at a speed of about 1 mm/s to force the edge of the pencil to break or plow the coating. It is appropriate. Starting with the hardest pencil, use each pencil to draw 5 times. If you can plow the coating twice in 5 times, use a softer pencil until you find at least 4 of 5 times. Until the coated pencil, the hardness of the pencil is the pencil hardness of the coating being tested.
â— Instrument operating procedures:
The sharpened pencil is placed in the instrument fixture, and the test surface to be tested is fixed upward on the sample stage of the instrument. Adjust the horizontal weight so that the pencil has zero surface load on the sample and then add a weight of 1 ± 0.05 kg. The specimen was moved 3 mm in reverse with the pencil and the moving speed was about 0.5 mm/s. Turn the pencil to make the edge of the lead-free lead contact the coating, and change the test position, plow 5 times in turn, start the test from the hardest pencil, if it can plow the coating twice in 5 times, change it to softer. One pencil, until the pencil that can not plow the coating is found at least 4 times out of 5 times, the hardness of the pencil is the pencil hardness of the tested coating.
QHQ paint film scratch pencil hardness tester:
The method stipulates that the relative hardness of the coating surface can be determined by using a pencil of known hardness, and can be operated by manual operation and instrument, and the arbitration test is operated by an instrument.
Pencil hardness tester sample:
The sample should be flat, free from oil and damage.
QHQ paint film scratch pencil hardness tester sample disposal and test environment:
Before the test, the sample to be tested should be placed in the environment of 23 ± 2 ° C for at least 24 h, and the test should also be carried out in the same environment. The arbitration test shall be placed and tested in an environment with a temperature of 23 ± 2 ° C and a relative humidity of 50% ± 5%.
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