How do surfactant supplier conduct quality control?

The main steps and measures for quality control by surfactant suppliers include the following aspects:
Data collection and inspection: When the supplier ships the goods, they are required to provide a component shipment inspection report and raw material certification documents, and deliver the goods in the order of production batches. Inspectors will conduct sampling inspections based on the 'Guidelines for Confirming Parts Inspection' to ensure that defective products do not flow into the company.
Supplier assessment: Based on factors such as the "Incoming Inspection Record", "Supplier Defect Statistics Table", and the supplier's response speed and attitude, a monthly comprehensive quality score evaluation will be conducted on the supplier, and they will be divided into five levels: ABCDE. For suppliers who have been rated as C-level for three consecutive months, on-site inspections will be conducted and relevant responsible persons will be interviewed; For E-level suppliers, they will be directly blacklisted.
On site audit: Conduct a comprehensive inspection of the supplier's site, including production equipment, process flow, quality control system, etc., to ensure their ability to produce high-quality components stably.
Abnormal handling of production line components: When a product is defective due to supplier reasons, in addition to unavoidable and single issue problems, emergency handling of the defective product must be carried out and emergency measures must be formulated. Suppliers need to make a commitment to full inspection during three consecutive batches of delivery and develop long-term countermeasures after in-depth analysis of the reasons.
Continuous improvement: Suppliers are required to engage in self reflection and improvement, including understanding the characteristics of the company's products and customer quality requirements, sorting out the main suppliers and the types of parts they supply, summarizing common quality problems and their countermeasures, and identifying the urgent problems that need to be solved.