INCI: Sodium Hydroxide CAS: 1310-73-2 Appearance: Sodium hydroxide flakes typically appear as solid white or translucent flakes or pellets. Chemical Properties: Sodium hydroxide (NaOH) is a strong base and is highly caustic. It is hygroscopic, meaning it readily absorbs moisture from the air. Applications: * Soap Making: Sodium hydroxide, along with fats or oils, is used in the process of saponification to produce soap. During this chemical reaction, the sodium hydroxide reacts with the fats or oils (known as triglycerides) to form soap and glycerin. Once the saponification process is complete and the soap has cured, there is no residual sodium hydroxide left in the finished product. * pH Adjustment: In some personal care products such as liquid soaps, shampoos, and facial cleansers, sodium hydroxide may be used in small amounts to adjust the pH level of the product. Maintaining the proper pH is crucial for the product's effectiveness and to ensure it is gentle on the skin. * Hair Relaxers: Sodium hydroxide is a key ingredient in some hair relaxer products used to straighten curly or kinky hair. In these formulations, sodium hydroxide helps break down the protein bonds in the hair, allowing it to be reshaped. * Chemical Peels: In dermatology and cosmetic treatments, sodium hydroxide is used in chemical peels to exfoliate the outer layer of skin. This process can help improve the appearance of skin by reducing fine lines, wrinkles, and hyperpigmentation. <