As a crucial respiratory support and protection device, the quality of face masks directly impacts patient ventilation safety and healthcare worker protection. Therefore, a rigorous and scientific testing process is essential to ensure all performance indicators meet standards. This process encompasses incoming material inspection, process control, finished product verification,and final product audit, forming a comprehensive quality assurance system covering the entire lifecycle.
Incoming material inspection is the first line of defense. For raw materials such as medical-grade polycarbonate, ABS, or silicone used in the main frame, supplier qualifications and material certificates must be verified. Batch sampling is conducted for physical performance testing, including tensile strength, hardness, aging resistance, and initial biocompatibility assessment, ensuring the materials are non-toxic, low-allergenic, and meet mechanical requirements. The elasticity, thickness uniformity, and compression resistance of the sealing pad are also verified at this stage; substandard raw materials are strictly prohibited from production.
Process control testing is implemented throughout the molding and assembly processes. After injection molding or liquid silicone molding, the first piece must undergo dimensional accuracy inspection. Tolerances in critical areas should be controlled within ±0.05mm, and the surface must be free of burrs, bubbles, or cracks. During assembly, the pressing or welding strength of connection ports must be sampled for tensile and sealing tests to prevent detachment or leakage during use. For protective masks with integrated filter layers, the filter material cutting accuracy and edge sealing firmness must be tested to ensure filtration efficiency meets design requirements. The headband adjustment buckle must undergo a cyclic opening and closing and locking reliability test to ensure it remains secure after multiple uses.
Finished product inspection is a core step in verifying product functionality and safety. Visual inspection confirms the absence of scratches, stains, and structural defects. Air tightness testing uses the pressure decay method or pressure difference method to simulate wearing conditions and determine if the edge seal meets standards. Functional testing is differentiated according to mask type: oxygen therapy masks undergo flow-resistance curve testing to ensure pressure drop meets requirements at rated flow; non-invasive ventilation masks undergo pressure resistance and fatigue testing, simulating repeated pressurization and depressurization processes to verify structural stability; protective masks are sampled for filtration efficiency, breathing resistance, and synthetic blood penetration testing to ensure they meet the corresponding protection level (e.g., YY/T 0969, GB 19083). Electrically integrated masks also require calibration of circuit safety and signal accuracy.
Factory audit and traceability are the final checkpoints. Each batch of finished products must have an inspection report, including key performance data and the signature of the testing personnel. The packaging must indicate the batch number, sterilization information, and expiration date. Disposable masks must be sterilized with ethylene oxide or irradiation and undergo sterility testing. Reusable masks undergo functional retesting after high-temperature steam sterilization to ensure safety for reuse.
Through these rigorous tests, the masks achieve reliable verification in terms of materials, structure, function, and safety, providing a solid quality foundation for clinical respiratory support and protection applications, and providing data support for regulatory compliance and continuous improvement.