Castor plant of castor test method 1. Impact test any goods transportation, use, save will crash vibration but the product may be produced in the state such as adverse even not be able to use a certain period of time, type furniture with its big, weight and other characteristics are often vulnerable to the impact, and smooth at the bottom to determine whether furniture placed casters are more should have a good shock resistance. European truckle test standard of shock test method is: will castor vertical backward installed on the ground test platform, the quality is 5 kg, ±2%) Heavy objects from height is 200 mm, the allowable deviation plus or minus 3 mm, the position of the free fall impact castor wheel edge, if for two rounds of two wheel should be hit at the same time. In the process of the whole experiment don't allow any part of the caster and separation. And experiment after the completion of the caster roll, circuition or brake function should not be damaged. 2. Resistance performance test when testing the performance castor should keep dry and clean, place the caster in a piece of insulation on the metal plate with the ground, keep the wheel edge in contact with the metal plate, on the caster wheel load of 5% to 10% of the nominal load. With the insulation resistance tester ( Nominal open circuit voltage of 500 v, determination of the resistance value of fluctuation within 10% and no more than 3 w) in the wastage of the products The electric resistance between castor and metal plate. In type conductive castor, resistance is not more than 104, and the resistance of the antistatic caster should be between 105 and 107. Caster, caster wheel factory, Shanghai universal wheel, universal casters