OEM Tempered Glass Screen Protector Quality Control A Simple 4-Stage QC System Buyers Should Audit A Brief Response For OEM tempered glass screen protectors, quality control involves more than simply a final examination. IQC, IPQC, FQC, and OQC are the four steps that a trustworthy manufacturer should adhere to. From raw supplies to the finished shipment, each stage inspects a distinct aspect of production. Defects, returns, and customer complaints may all be decreased with a robust quality control system. For an OEM buyer, the most helpful question is straightforward: "Are the QC records from your most recent production batches available [...]