Visual inspection serves as a fundamental step in quality testing for air fresheners, focusing on the product's color, odor, physical state, and packaging condition. For liquid air fresheners, the liquid must be checked for uniformity and the absence of separation, sedimentation, or impurities; for gel-based products, the stability of the gel structure is assessed. Additionally, sensory evaluation helps determine whether the fragrance is natural and free from harsh, irritating odors, providing an initial assessment of product quality.
Physicochemical testing covers aspects such as pH levels, stability, volatility, and active ingredient content. Measuring the pH value with professional instruments reveals the stability of the formulation, while high-temperature, low-temperature, and long-term storage tests help detect any signs of product deterioration. Furthermore, simulating actual usage environments allows for the measurement of fragrance release rates and duration, enabling an evaluation of the product's volatility performance and effective lifespan.
Regarding safety, air fresheners typically undergo testing for specific constituents, such as volatile organic compound (VOC) levels, the presence of harmful substances like formaldehyde, and microbiological indicators. Experimental analysis of these substances determines whether the product meets safety standards, thereby minimizing potential adverse effects on human health and the environment. Moreover, for households with vulnerable groups-such as children and the elderly-particular attention is paid to the product's mildness and safety profile.