A sample from each lot of PVC geomembrane representing approximately every 10,000 pounds is retained for testing. The retained samples are checked according to the National Sanitation Foundation Standard 54 for Flexible Membrane Liners. Once all the information is gathered, it is reviewed by a quality control manager, who in turn, signs the certification. Copies of certification are supplied to customers with the shipment. Feed Back Any good Quality Control program involves addressing any quality issues that may arise in the field.
Many companies provide a technical service that investigates any material in question.
Quality control departments examine actual samples sent back from the field. Those samples undergo an investigation in order to determine cause of the defect or performance issue. The exact methods used by each manufacturer of PVC geomembrane may vary slightly. However, every manufacturer takes steps to assure that proper quality control and assurance is used throughout the entire process. It is the quality control and assurance programs that guarantee the quality needed for geosynthetic applications aimed at protecting the environment and the ultimate user of the PVC geomembrane.