First may determine the testing standards.
Agree as to testing standard should negotiate with suppliers, the accepted standard. Otherwise it is easy to cause disputes. For example, one of them, the thickness of the material, you can purchase price of the product can only buy 0.6 MM thick cold rolled steel file cabinets, if at the time of testing required material thickness is 0.8 MM, the contradiction is appeared.
In addition, cold rolled steel file cabinet surface is using high temperature electrostatic powder spraying treatment. But for the quality of the powder and is in line with the requirements of environmental protection, the product is made after the comparison can tell, that may require manufacturers to provide certificate of environmental protection powder manufacturers purchase order and powder.
Detection after arrival of the goods has not much effect. If you need to test, then through the visual way.
?
