性一交一乱一乱一A级无遮挡超级高清视频在线观看,，亚洲AⅤ优女AV综合久久久2020超碰欧美精品最新,，久久久久人妻一区

On Rubber Hardness

The material covered on the cot roll body can be as hard as metal or as soft as sponge. It is suitable for various hardness ranges because of its different uses.

The hardness of COTS is the only criterion that can simply predict the compression deformation characteristics of cots in use.

That is to say, the hardness determines the gap between the cots and affects the contact time between the cots and the contactors.

1. Detection tools

The hardness tester type A (Shao's A) is generally used for soft materials.

2. Points for Attention in Using Spring Hardness Meter

On the Reading Method of Scales

Keep the hardness tester perpendicular and the pin perpendicular to the measuring surface so that it contacts the pressure surface and reads the scale.

3. Effect of Temperature on Rubber Hardness

Usually the hardness of rubber decreases with the increase of temperature. Therefore, the comparison of hardness needs to be carried out at the same temperature.

In principle, the ambient temperature for hardness measurement is set at 23 2 C.

4. Individual difference in measurement

Because of the individual differences of pressure, pressure speed, pressure angle and scale reading of hardness tester, the measured values will be different.

In view of this situation, our company has stipulated that the allowable error range of the measured value is (+3).