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The quality of hot drilling is determined from three aspects of brightness, cut, uniformity and glue fastness.
Look at the appearance First look at the cutting surface of hot drilling, the more the cutting surface, the more his refractive index, brightness better, and then see whether the cutting surface is even, there are teeth, scratches, bubbles are considered defective. Hot drilling process requirements strict, complex process, yield is not very high, defective rate of 3%-5% of the diamond should be regarded as a good product, and then see the size of the diamond is consistent. The diameter of the SS6 number is in the 2.7-2.9mm of the 1.9-2.1MM,SS10 number ....
You should also see whether the thickness is consistent.
Look Back gum Turn the diamond over to see the color of the back of the glue, color uniformity, can not vary in depth.
Bright and uniform color, as a good diamond.
Look firm The higher the solubility of the adhesive on the back of the hot drilling, the better the diamond firmness.
The best way to identify the diamond is: hot after washing in the washing machine, after washing does not fall off, proof of good fastness, a wash off, proof of the firmness of the glue, good products dry cleaning also do not drop.
Attached to the common grade Commonly used in Korea hot drilling is divided into special A, Class A, B-class.
Special A-Class: high brightness, no noise drilling, cutting surface uniformity, no teeth, scratches, bubbles, defective rate of 1%-2%, the probability of degumming is 0.5%-1%, the size of the diamond is consistent, high degree of firmness.
A-level: brightness, a small number of noise drilling, uneven cutting surface, there are teeth, scratches, bubbles, defective rate of 5%-8%, the probability of degumming is 1%-2%, the size of the diamond is consistent, high degree of firmness. B Grade: Brightness difference, there are 15% of noise drills. Uneven cutting surface, multiple teeth, scratches, bubbles, defective rate of 20%-50%, the probability of degumming is 3%-10%, the size of the diamond is inconsistent, the degree of low firmness.