Definition of compatibility test for cosmetic packaging and cosmetics
The compatibility of cosmetic packaging with its contents broadly refers to the interaction between plastic packaging and cosmetics, including chemical compatibility, physical compatibility, and biocompatibility.
The following is a brief description of the specific incompatibility of each type:
Chemical incompatibility: The chemical composition of the packaging material, chemical reaction between the decomposition product and the cosmetic component during processing, adversely affecting the cosmetic or packaging materials; chemical incompatibility is manifested as a change in the appearance and odor of the packaging material or cosmetic.
Biological incompatibility: Some substances in the packaging material migrate into the cosmetics and have adverse effects on the user; the amount of harmful substances dissolved exceeds the measurement specified in the relevant cosmetic hygiene standards or specifications of the country where the cosmetics are sold; in general, Hazardous substances include various plastic additives, residual solvents, volatile organic compounds, and harmful metal elements. Of course, not all dissolved plastic additives will have a serious impact on the properties of the cosmetics. When the dissolution component is one of the cosmetic ingredients, the amount of dissolution is small, and the dissolution is harmless to the user, the dissolution appears to be normal. Compatible. The colorant in the plastic precipitated into the contents, and the contents were originally beige.
Physical incompatibility: The packaging material and the contents are physically changed due to the influence of each other; the physical incompatibility is manifested by penetration, adsorption, cracking, cracking, dissolution, and the like. In the test judgment, physical incompatibility is often misjudged as chemical incompatibility, which is due to the obvious phenomenon of physical incompatibility, and the reaction is more severe.
In view of the fact that the plastics used in cosmetic packaging materials have certain solvent resistance properties, and the cosmetics themselves are relatively mild, the incompatibility between cosmetics and packaging materials is more physically incompatible.
The performance of the results of the compatibility test is actually quite complicated. Usually, many colleagues ask that if the compatibility is unsatisfactory, then all the samples should react with the contents, and each sample should have The question is right, why is there a good or bad sample at the same temperature? In fact, there is a certain ratio of unqualified compatibility. For example, at 40 ° C, 10 samples were tested, only 2 samples were cracked, and the remaining 8 samples were intact, but when you expanded the sample volume to hundreds of samples, It will be found that the number of cracked samples has increased to dozens; and so on, if such a package is put into mass production, the last problem may not be a small amount. In addition, experiments by fine chemical quantitative analysis have shown that the incompatibility of cosmetic packaging materials with their contents is usually not a single manifestation.