Surface
scratch resistance is the ability to detect the surface of the product
decorative paper against a certain role under the diamond needle. Wipe the surface of the specimen, the measured surface up fixed on the scratch test bench. Adjust
the height of the beam, so that the diamond tip contact with the
specimen surface, the upper edge of the beam in a horizontal position. The
weight moved to 1.5N position to start the stage rotation, so that the
diamond needle in the specimen surface to draw two concentric circles,
in the radial direction between the scratches and scratches the distance
of l-2mm to remove the specimen , Observe the specimen was scratched parts of the situation.
ISO 12137-1: 1997 and ASTM D5178-98 Test principle: The test product is applied in a uniform thickness to a flat surface with uniform surface texture. After drying / curing, the scratch resistance is measured by pushing the test plate under the arc (ring or ring) needle, and the needle is mounted to press the surface of the test plate at an angle of 45 °. The pressure on the test plate is increased step by step until the coating is scratched.ISO 12137-2: 1997 Test principle: The test product is applied in a uniform thickness on a flat surface with uniform surface texture. After drying / curing, the scratch resistance is measured by pushing the test plate under the pointed needle, and the needle is mounted so as to be pressed in the vertical direction onto the surface of the test panel. Continuously increasing the load on the test plate until the coating is scratched.Test step and result representation:
ISO12137-1: 1997 and ASTM D5178-98 Standard: The test plate coating is fixed on the movable table with the side of the test plate facing up and the balance beam is adjusted so that the balance beam is balanced on the horizontal side when the ring is just in contact with the surface of the test plate The The load of the initial mass, which is expected to be commensurate with the specific coating, is applied to the load support, releasing the balance beam and releasing it carefully until the ring is placed on the paint plate and the applied load is applied to the ring. At a speed of 3 to 6 mm / s, the movable table is slowly pushed and moved by a distance of at least 75 mm. If the coating is scratched, the test is continued with a smaller load (0.5 kg increments) until the coating is not scratched. If the initial scratch coating is not scratched, the test is continued with a larger load (0.5 kg increments) until the coating is scratched or until a maximum load is applied. Each scratch test should be carried out in a new area of the test surface. When the critical load is roughly determined, the test is carried out in three cases with a load higher than, less than, and initially determined, and each case is subjected to five tests. Record the number of times the coating was scratched, resulting in a minimum load of at least 2 times that caused the film scratches in five determinations.
ISO12137-2: 1997 Standard: Fix the test plate to the slide table with the side of the test plate facing up and adjust the counterweight so that the stroke of the needle is zero when the needle is just touching the surface of the test panel. Select the load range, such as 0 ~ 50g, to 10mm / s speed start the tester, when the sliding table moves 100mm when the instrument will automatically stop. Check whether the coating is scratched, if not scratched, then use another suitable load range to test until scratches occur. In the same test plate in the range of the occurrence of scratches at least twice the repeated measurement (that is, a total of at least 3 times). The distance d from the final load point (i.e., the point at which the needle is stopped) to the point where the scoring point has just occurred is measured in each of the three determinations. According to the following formula to calculate the load outside the scratch point, that is, the critical load, in g dollars.Critical load = (100-d) / 100 × (Ff-Fi)Where: d - the distance from the final load point to the point where the scratch point has just occurred;Ff - the initial load of the selected stroke load range, in g;Fi - the final load of the selected stroke load range, in g;The results are expressed in terms of the average critical load of 3 determinations and the results are accurate to 1 g.
ISO 12137-1: 1997 and ASTM D5178-98 Test principle: The test product is applied in a uniform thickness to a flat surface with uniform surface texture. After drying / curing, the scratch resistance is measured by pushing the test plate under the arc (ring or ring) needle, and the needle is mounted to press the surface of the test plate at an angle of 45 °. The pressure on the test plate is increased step by step until the coating is scratched.ISO 12137-2: 1997 Test principle: The test product is applied in a uniform thickness on a flat surface with uniform surface texture. After drying / curing, the scratch resistance is measured by pushing the test plate under the pointed needle, and the needle is mounted so as to be pressed in the vertical direction onto the surface of the test panel. Continuously increasing the load on the test plate until the coating is scratched.Test step and result representation:
ISO12137-1: 1997 and ASTM D5178-98 Standard: The test plate coating is fixed on the movable table with the side of the test plate facing up and the balance beam is adjusted so that the balance beam is balanced on the horizontal side when the ring is just in contact with the surface of the test plate The The load of the initial mass, which is expected to be commensurate with the specific coating, is applied to the load support, releasing the balance beam and releasing it carefully until the ring is placed on the paint plate and the applied load is applied to the ring. At a speed of 3 to 6 mm / s, the movable table is slowly pushed and moved by a distance of at least 75 mm. If the coating is scratched, the test is continued with a smaller load (0.5 kg increments) until the coating is not scratched. If the initial scratch coating is not scratched, the test is continued with a larger load (0.5 kg increments) until the coating is scratched or until a maximum load is applied. Each scratch test should be carried out in a new area of the test surface. When the critical load is roughly determined, the test is carried out in three cases with a load higher than, less than, and initially determined, and each case is subjected to five tests. Record the number of times the coating was scratched, resulting in a minimum load of at least 2 times that caused the film scratches in five determinations.
ISO12137-2: 1997 Standard: Fix the test plate to the slide table with the side of the test plate facing up and adjust the counterweight so that the stroke of the needle is zero when the needle is just touching the surface of the test panel. Select the load range, such as 0 ~ 50g, to 10mm / s speed start the tester, when the sliding table moves 100mm when the instrument will automatically stop. Check whether the coating is scratched, if not scratched, then use another suitable load range to test until scratches occur. In the same test plate in the range of the occurrence of scratches at least twice the repeated measurement (that is, a total of at least 3 times). The distance d from the final load point (i.e., the point at which the needle is stopped) to the point where the scoring point has just occurred is measured in each of the three determinations. According to the following formula to calculate the load outside the scratch point, that is, the critical load, in g dollars.Critical load = (100-d) / 100 × (Ff-Fi)Where: d - the distance from the final load point to the point where the scratch point has just occurred;Ff - the initial load of the selected stroke load range, in g;Fi - the final load of the selected stroke load range, in g;The results are expressed in terms of the average critical load of 3 determinations and the results are accurate to 1 g.
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