Coating is the coating hardness (tu) industry manufacture, coating used for quality that will measure indicators. Pencil scratch method of coating hardness test is widely adopted since the eighty s by the international test methods.
The instrument is according to the national standard "film pencil hardness measurement" GB6379-86-2, article 3 of manual operation and the design and manufacture. Instrument can be used in the laboratory, also can be applied to the construction site, and can be in any direction on the identification on the coating hardness.
The structure and working principle: Instrument for mechanical, three contact surface to be tested (for round 2 o 'clock, a bit of lead) always guarantee a pencil with 45 ° Angle measured surface formation, forcibly horizontal drive instrument movement, can complete the testing process, determination of coating's ability to resist deformation.
3. Use requirement
1. GB1279-79 "general preparation method of coating, the preparation of test pieces of 3 pieces, for smooth tin plate commonly 50 * 120 * (o. 2-0.3 mm, or products shall be separately stipulated by the substrate and size.
2. The test conditions: according to the requirements of product standards or construction conditions.
Suggest at least three specimens location above, average. Hardness of the series, with a pencil from soft to hard 4 B, 6 B 5 B 3 B 2 B B HB H H, 2 H, 3 H 4 5 H, 6 H (13).