The definition of hardness represents the ability of materials to resist external force, that is, the resistance of materials to rigid bodies when pressed. The size reflects the hardness and hardness of materials. The hardness of adhesives is mainly measured by shore hardness. The hardness of Shaw is generally commonly used in 3 kinds of shore D/A/00, and the soft and hard degree descends in turn. The 00 level is generally used on very soft objects in the gel class; the A level is similar to the elastic hardness of the rubber; the D level describes the hard objects. The concrete hardness is represented by the number, and the greater the value at the same level, the harder it is. No conversion formula between the general level, that is D20 A90.
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