Borax (Sodium Borate) — Cosmetic Ingredient

Borax

INCI Name: Sodium Borate

Common Name: Borax, Sodium Tetraborate

Functions: pH Buffer, Emulsifier (with beeswax), Preservative Booster

Typical Usage Rate: 0.5-2%

Phase: Water Phase

Solubility: both

Used in: LotionMath

Notes: Mild alkaline salt; pH 8-10; traditional emulsifier with beeswax; preservative booster. EU restriction: Annex III limits borax in leave-on products (max 0.1% in face/body care; max 3% in rinse-off). No US federal restriction.

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