Detailed Explanation Of Facial Serum Testing Process

As a high-efficacy category of skincare products, the quality and safety of facial serums directly impact consumer experience and skin health. To ensure products meet national standards and company quality requirements, the testing process for facial serums involves rigorous control over multiple stages.

 

Step 1: Appearance and Physicochemical Indicator Testing
Testing personnel first visually inspect the serum's appearance, including color, transparency, viscosity, and the presence of sediment or layering. Subsequently, physicochemical parameters such as pH value, viscosity, and specific gravity are measured using instruments to ensure the product's texture matches the formula design, avoiding skin irritation caused by improper pH levels.

 

Step 2: Microbiological and Hygiene Indicator Testing
The serum undergoes strict microbiological testing, including screening for total bacterial count, molds and yeasts, Staphylococcus aureus, and pathogenic bacteria such as Escherichia coli. This step employs aseptic sampling and culture methods to ensure the product is free from microbial contamination and meets the hygiene standards of the "Cosmetic Safety Technical Specifications."

 

Step 3: Active Ingredient Analysis
Using techniques such as High Performance Liquid Chromatography (HPLC), Gas Chromatography (GC), or Ultraviolet-Vis Spectrophotometry (UV), the content of active ingredients (such as Vitamin C, hyaluronic acid, niacinamide, etc.) in the serum is accurately determined to verify whether it reaches the nominal concentration. Simultaneously, the presence of prohibited or restricted substances is detected.

 

Step 4: Stability and Compatibility Testing
The serum is stored under high temperature (40℃), low temperature (-5℃), and light conditions to observe changes in its physical properties and assess its long-term stability. In addition, packaging compatibility testing is conducted to ensure there is no risk of chemical reaction between the serum and the bottle material.

 

Step 5: Safety Assessment
Through human patch tests or volunteer trials, the serum is observed to observe whether it causes adverse reactions such as allergies or redness. A comprehensive test report is generated to ensure the product's safety and effectiveness before it is released to the market.

 

Standardized testing procedures are the core link in ensuring the quality of facial serums and reflect the company's responsibility to consumers.