Salicylic acid powder
Description: Organic beta hydroxy acid (chemical name: 2-hydroxybenzoic acid), occurs naturally in various plants. Fine, white powder, odorless. USP grade. Solubility: see below. pH Value: 2.4. Melting Point: 159°C (318°F).
Water: about 0.2% at 20oC, about 1.7% at 75oC (by adding about 5% of sodium phosphate or another neutral salt, the solubility of salicylic acid in water is increased to about 1.8%)
Alcohol (ethanol): about 14% in pure ethanol, about 0.5% in 20% ethanol
Propylene glycol: about 3-6%
Glycerin: about 1.6%
INCI Name: Salicylic acid
- Can be used for skin peels, anti-dandruff products, and in products for oily, acne, and/or blemished skin
- Ideal for making products that need higher concentrations of salicylic acid
Use: Typical use level 0.5-3%. Typically, it is added to the water phase of formulas but it is only slightly soluble in water. If used at concentrations higher than 2%, propylene glycol should be used as a solvent. Salicylic acid can be added also in powder form to a finished cream or lotion without dissolving it first in water or another solvent.
Applications: Peels and exfoliant products. Anti-acne products (max. 2%).
Anti-dandruff products (max 3%). Wart-removing products (max. concentration depends on the type of plaster vehicle used).
Country of Origin: France
Raw material source: Sodium phenoxide and carbon dioxide.
Manufacture: Salicylic acid is prepared from dry sodium phenoxide in a stream of carbon dioxide. It is further purified by crystallizing the sodium salicylate from water at a temperature not exceeding 20 deg C.
Precautions: Make sure that you measure the pH value after adding salicylic acid as it can lower the pH significantly. A pH lower than 3.5 should be avoided as skin irritations can occur.
To avoid excess peeling/irritation of the skin be careful when using salicylic acid together with abrasive soaps or cleansers, alcohol-containing products, or other topical acne or peeling products (e.g. benzoyl peroxide, resorcinol, sulfur, tretinoin), soaps or cosmetics that dry the skin.
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