Zinc Borate

Definition: Zinc borate (CAS No. 1332-07-6) is a white, crystalline, and inorganic compound that is insoluble in water. It's a boron-based substance that incorporates zinc, and is commonly utilized as a flame retardant and smoke suppressant in plastics and rubber materials. In the cosmetic realm, it also finds its use due to its antimicrobial properties and its ability to inhibit the growth of fungi and bacteria.

Usage in Cosmetics: In cosmetics, Zinc borate is utilized for its antimicrobial properties which help in preserving the product and extending its shelf life. It may be found in a variety of cosmetic and personal care products including lotions, creams, shampoos, and makeup products. The compound can also act as a deodorizing agent and can aid in the control of malodor in cosmetic products.

Synonyms: Zinc borate may also be referred to as ZB, Zinc borate 2335, Zinc borate 1137, or Firebrake ZB.

Skin Sensitivities and Allergies: Zinc borate can potentially cause skin irritation or sensitization in some individuals, especially those with sensitive skin. It may cause dryness, itching, or redness on skin contact, although the severity of the reaction may vary from person to person. People with sensitive skin should exercise caution when using products containing Zinc borate.

Risks Associated with Use: The primary risk associated with Zinc borate in cosmetics is potential skin irritation. However, the risks might extend to systemic toxicity if used in excessive amounts, although such scenarios are quite unlikely with typical cosmetic use.

Ban Information (California Ban): The recent legislation in California, Assembly Bill No. 496, has expanded the list of banned ingredients in cosmetic products, effective from January 1, 2027. The bill lists Zinc borate among the substances prohibited in cosmetic products due to potential health concerns. The prohibition encompasses the manufacturing, selling, delivering, holding, or offering for sale in commerce any cosmetic product containing Zinc borate, among other listed ingredients. This step reflects a growing concern over the safety of certain chemical substances in personal care products, particularly for sensitive skin consumers.

This banning act is part of California's ongoing efforts to ensure cosmetic safety and protect consumers from potential health hazards associated with certain chemical ingredients. The exact reasoning behind the ban may be tied to concerns over skin sensitivities, potential toxicity, and the broader health implications associated with prolonged exposure to Zinc borate and similar chemical substances.