Caprylhydroxamic Acid (CHA)

Caprylhydroxamic Acid (CHA) – Mild Chelating Preservative for Cosmetics

Basic Information

• INCI Name: Caprylhydroxamic Acid

• CAS Number: 7377-03-9

• Molecular Formula: C₈H₁₇NO₂

• Appearance: White to off-white crystalline powder

• Solubility: Soluble in glycols, alcohols, and some organic solvents; slightly soluble in water

Overview
Caprylhydroxamic acid (CHA) is a mild, non‑traditional preservative used in cosmetic and personal care formulations. It acts through metal chelation – binding to metal ions essential for microbial metabolism – thereby inhibiting the growth of bacteria, yeast, and mold. CHA is particularly valued for its compatibility with phenoxyethanol and glycols, offering a synergistic preservation system that reduces the need for higher concentrations of traditional preservatives.

Key Features

• Effective against a broad spectrum of microorganisms (bacteria, fungi, yeast).

• Works synergistically with phenoxyethanol, glycols, and other preservatives.

• Stable over a wide pH range, especially near neutral (pH 5–8).

• Non‑irritating and considered safe for leave‑on and rinse‑off products.

• Imparts no unpleasant odor or color to finished formulations.

• Biodegradable and environmentally friendly.

Applications

• Leave‑on products: creams, lotions, serums, sunscreens.

• Rinse‑off products: shampoos, body washes, facial cleansers.

• Color cosmetics: foundations, mascaras, lip products.

• Baby care and sensitive skin formulations.

• Natural and preservative‑free claim products.

Recommended Use
Typical usage levels: 0.2–1.0% of the total formulation. Often combined with phenoxyethanol (0.5–1.0%) and glycols to achieve broad‑spectrum preservation.

Handling and Storage

• Store in a cool, dry, well‑ventilated area, away from direct sunlight and moisture.

• Keep containers tightly sealed to prevent contamination.

• Use appropriate personal protective equipment (gloves, safety goggles) when handling.

Packaging
Available in 1 kg, 5 kg, 25 kg containers, and custom packaging upon request.

Quality Assurance
Each batch is tested for purity (by HPLC), water content, and heavy metals to ensure consistent quality for cosmetic applications.