When buying a felt, not only do you have to check its quality and performance, but you also need to inspect its outer dimensions. How should it be inspected?
First, to check its length, you need to use a steel ruler to measure the length of the felt at the center line of the felt and 150 mm from both sides of the felt. The length of the felt is required to be accurate to 0.01 meters. Then check the width of the felt. If the length of the felt is less than 2 meters, you need to use a steel ruler. If the length of the felt is more than 2 meters, you need to start from one end of the felt and measure the width every 1 meter. The measurement should be accurate to 0.01 Meter. The third is to check the thickness of the felt, which is measured with a dial gauge thickness gauge.
Generally speaking, the thickness and length of felt are a standard to measure the quality of felt, so we need to check it carefully when purchasing.