4-Hydroxybenzaldehyde

4-Hydroxybenzaldehyde (CAS 123-08-0), also known as PHB, 4-formylphenol, and FEMA 3984, is an aromatic aldehyde derived from phenol. It carries no assigned E-code and is classified under HS code 29124900 as a pharmaceutical intermediate with cross-sector relevance.

In pharmaceutical synthesis, PHB serves as a key building block for active ingredients including antiviral and antimicrobial compounds, reacting through its aldehyde group to form more complex molecular structures. In personal care formulations, it functions as a UV absorber and antioxidant, intercepting free radicals and attenuating UV-induced degradation of sensitive ingredients.

4-Hydroxybenzaldehyde is supplied as a crystalline powder meeting pharmaceutical-grade specifications aligned with REACH registration requirements. It is available in standard industrial packaging suitable for formulation and synthesis environments. Procurement teams should confirm grade suitability against Ph.Eur. or FCC standards depending on the intended application.