Sliding door’s construction is same, even their brand is different. But we can see the different and level form the sliding door hardware accessories. Usually it is expensive when it uses the great brand’s hardware accessories, so it is cheap when it uses the cheap hardware accessories. Sliding door’s main construction: Munnion, On track, Under track, On transverse frame, Under transverse frame, roller , Bumper rail and locator. Sliding door’s material is stainless steel, Aluminum and other alloy. Now, expect the cheap door uses the stainless steel, many doors use the Aluminum and other alloy. And the surface treatment is spray lacquer, zincing and PVC covering.
  Sliding door material’s quality depend on:
  1. Material aluminum: wether use the national Aluminum, and it decides the products’quality and costs. But now many factories use the reduce aluminum, its appearance with disposing can’t be find out by the customers.
  2.Wall thickness: Must choose more than 1.2mm thickness’ products. The material of window and door must more than 1.20mm. Outward window and outward door’s mixmum thickness must accord with GB/T 848B, GB/T and 8479.
  3.Surface treatment: Lacquer is smooth or not, the sample of PVC is blister or not. Sliding door roller: Roller is the importance of the sliding door, sliding door’s life and result are depend on the roller. Great brand will not despise of the roller, roller’s quality good or not depend on the roller’s bearings and material’s quality.