Dimethyloldimethyl Hydantoin (DMDMH) CAS 6440-58-0 Product Introduction Dimethyloldimethyl Hydantoin (DMDMH) is a highly effective, formaldehyde-releasing preservative and antibacterial agent widely used in personal care, cosmetics, and industrial formulations. With CAS number 6440-58-0, it is recognized for its broad-spectrum activity against bacteria, yeast, and mold. DMDMH works by slowly releasing formaldehyde in small, controlled amounts, ensuring long-lasting protection