How to test the hardness of SDA accessories?

The hardness test results of many customers will be big different from ours. Is it because our test has problems or quality problems? The answer is No. for this problem, we have explained to many customers that the main difference is that the inspection equipment and methods are inconsistent.

We use Brinell hardness tester to press the polished surface with steel ball head, and observe the hardness with eyepiece. Often many customers check the hardness of products by Rockwell hardness tester, which is incorrect. Rockwell hardness tester is suitable for products with machined surface rather than rough surface. For this kind of difference, we will explain to our new customers in the future to make them understand the difference. The purpose of us and our customers is to keep the quality of our products in a stable level.

How to measure AGT?

What is the difference between elongation A and AGT?