Products were inspected for conformity both in-process and finish. Ex. Melt flow tested according to ISO1133 method must be met the qualification of TISI standard for HDPE pipe which required reduction in melt flow rate not exceed about 25%. In addition, diameter and roundness of pipes must also be inspected. Those inspections are performed by QC department upon release of the products.QC do IQC by it's STD and keep record(s), P; IPC and FQC conducted by QC department. QC manager was the authority to release the product, verify the quality cotrol process, such as order No. 4447, on date 06/04/2016, Material: PET100, Tube size: Ø315-316 mm Thickness= 12.2-13.5 mm. Sampling 8 pcs, following WI-QC-02, results= Ø315.4 mm and thickness=12.4 mm, pass.