How do fragrance chemicals suppliers control product quality?

fragrance chemicals suppliers can control product quality through the following measures:
Quality Management System: Establish and improve a quality management system to ensure that every step from raw material procurement to finished product delivery meets quality standards. This includes developing detailed quality control processes, implementing quality inspections and testing, as well as regularly auditing and improving management systems.
Raw material control: Strictly control the quality of raw materials to ensure that all raw materials comply with national or international standards. Suppliers should provide detailed Material Safety Data Sheets (MSDS) and Certificate of Composition Analysis (COA) to demonstrate the safety and quality of raw materials.
Production process control: Implement strict quality control measures during the production process, including monitoring of the production environment, regular maintenance and calibration of production equipment, and recording and tracing of the production process. Ensure that every step in the production process meets quality standards.
Finished product inspection: Conduct strict quality inspection on finished products, including appearance inspection, physical and chemical property testing, toxicological evaluation, and allergen testing. Ensure that the product meets safety standards and performance requirements.
Certification and standard compliance: Actively participate in international and domestic certifications, such as IFRA certification, to ensure that products comply with global safety standards. IFRA certification requires toxicological assessment, allergen control, and maximum concentration limits for spice ingredients to ensure product safety and compliance.
Continuous improvement: Establish a continuous improvement mechanism, such as the PDCA cycle (Plan Do Check Act), regularly analyze quality issues, and take measures to improve. Continuously improve product quality and management level through analysis of quality accident cases and employee training.