Casters have many performance parameters.When choosing casters,these parameters are also very important.So understanding these specs are needed. Now let's see the parameters we need to focus on.
1.Hardness: Measure the hardness of rubber wheel and other materials wheels&rims,specified by Shore A or Shore D.During compressed strength testing, testing sample's maximum compression stress specified by M pa.
2.Elongation rate:the rate of between initial length of the sample and the length when sample broken,specified by %.
3.Impact strength: it's material shocked by free dropping weight,specified by inch/pound.
4.Deformation resistance under heavy loads:The rate between initial wheel height and the height of wheel that loads removed after a regulated pressed time
5.Water absorption rate: testing samples weight. Rate between Samples weight before and after special test.
6.Temperature: Temperature range tested under rated loads-bearing.
7.Adhesive force:Splitting wheel tread from wheel center needed force (pound) at the speed of 6 inches/min divided by wheel width.
8.Tensile strength:wheel broken from cross section needed strength(pound) divided by dimension of section(Sq.In.)