Testing methods for lip balm raw materials primarily focus on three key aspects-safety, physicochemical properties, and stability-to ensure that the materials meet the requirements for cosmetic manufacturing.
Safety Testing
This focuses primarily on heavy metal content and microbiological indicators. Common tests include the analysis of heavy metals such as lead, arsenic, mercury, and cadmium, as well as total bacterial counts and the detection of molds and yeasts. These measures ensure that the raw materials do not cause irritation or pose potential risks to human health during use. Such testing is particularly critical for colorants and mineral powders.
Physicochemical Property Testing
This mainly encompasses parameters such as acid value, peroxide value, moisture content, melting point range, and viscosity. For oil- and fat-based raw materials, acid value and peroxide value are used to assess their degree of oxidation and freshness; waxes are evaluated through melting point and hardness tests to determine their molding capabilities; and powders undergo testing for particle size distribution and dispersibility to ensure their uniformity within oil-and-wax systems.
Stability and Application Performance Testing
This includes assessments of heat resistance, cold resistance, compatibility, and storage stability. Through high-temperature and low-temperature cycling or accelerated aging experiments, the raw materials are observed for signs of phase separation, discoloration, or changes in odor, thereby allowing for an evaluation of their suitability for actual manufacturing processes. Collectively, these tests serve to guarantee the safety, stability, and consistent performance of lip balm raw materials within product formulations.