At present, the oily raw materials commonly used in cosmetics on the market can be divided into vegetable oils, animal oils, mineral oils and synthetic oils according to their ingredient sources.And cosmetics oem When manufacturers choose prototype raw materials in cosmetics, they generally choose according to the characteristics and quality of the oily raw materials.At the same time, the physical and chemical properties of oily raw materials are crucial to the appearance, stability and use effect of cosmetics.Then cosmetics oem What are the requirements for manufacturers to choose oily raw materials in their products?

The first thing is to do is to have viscosity standards.Generally, oily raw materials have a higher viscosity, which is due to the attractiveness between long-chain molecules in oily raw materials.In addition, the viscosity of oily raw materials will also have a direct impact on the spreadability of cosmetics, and also affect the texture of cosmetics.

Secondly, the specific gravity of oily raw materials. Generally, the specific gravity of oily raw materials is proportional to its molecular weight and viscosity, and inversely proportional to its temperature.The smaller its molecular weight or the higher its unsaturation degree, the greater its specific gravity.The size of specific gravity directly affects the stability of cosmetic products. Generally, oils with specific gravity similar to that of water are generally selected.

Finally, it is the acid content in oily raw materials.If the oils and fats in animals and plants are stored for too long, they will hydrolyze and produce some free fatty acids, so the acid price also marks the freshness of the oils.The higher the acid price, the more severe the oil and fat, the less fresh it is, and the worse the quality.Generally, the acid price of fresh oil is less than 1.

at present.Many cosmetics are the main ingredients of oily raw materials, so many cosmetics oem The manufacturer is also strict when choosing oily raw materials to ensure the quality and effect of the product.