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This specification is to control the qualities of color coated sheets in flat, corrugated sheets and coils of Vnsteel Thang Long. This standard based on Japanese Industrial Standard JIS G3302, European Standard EN10169 and American ASTM A755/A755-03.
This specification is to control the qualities of color coated sheets in flat, corrugated sheets and coils of Vnsteel Thang Long. This standard based on Japanese Industrial Standard JIS G3302, European Standard EN10169 and American ASTM A755/A755-
2.1. Bending test
This test is to test the adhesion of paint dry film at 180o . It is also to test the paint dry film strength of products corrugated. There shall not be any flaking of the coating, cracking (visible to the naked eye) or fracture of the base metal on the outside of the bend portion. Specification is 0T-3T.
2.2. Solvent resistance (MEK)
This test is to test the vulcanization of the paint dry film on the galvanized substrate by MEK (Metyl Etyl Keton) testing method. Standard for Solvent resistance is > 100 (DR) without causing the paint dry film take off.
2.3. Pencil hardness test
This test is to test the hardness of the paint dry film by using types of pencils from 2H to 5H. Standard for pencil hardness is ≥ 3H with the paint dry film not scratched
2.4. Impact test
This test is to test the impact resistance of the paint dry film during roll forming. The test is passed when the weight dropped from a heights of 500mm above the test piece without causing paint fry film take off
2.5. Adhesion (Erichsen)
This test is to test the adhesion of the paint dry film (between primer and finish paint with the galvanized substrate) by using Erichsen equipment. The test surface is scored 100 squares of 1 mm by a safety razor blade and then is pressed with the ball head of the tester slowly. The test is passed if 98-100% of the contact surface without paint take off
2.6. Color difference (DE)
This test is to test the color difference between testing piece and standard panel. The color difference < 1% compared with standard panel
2.7. Gloss (picogloss)
This test is to test the gloss of the paint dry film by Picogloss. The gloss ± 3 compared with the standard panel.
2.8 Thickness of the zinc coating- Chromate – Paint dry film
Remark: Further, other values may be applied upon agreement between the purchaser and manufacturer
2.9 Tensile strengt
2.10 Tolerance on width
2.11. Tolerance on thickness
2.12 Density of normal sizes
Remark: The density above, only for reference, the factory shall inform in detail the density of coil to the purchaser.
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