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<h3>Overview</h3>
<p><strong>4-Hydroxybenzoic acid</strong> (CAS: <strong>99-96-7</strong>) is a key aromatic intermediate synthesized via Kolbe-Schmitt reaction of phenol. Molecular formula: C<sub>7</sub>H<sub>6</sub>O<sub>3</sub>. It serves as a fundamental building block for preserving agents and polymer modifiers.</p>
<h3>Application</h3>
<ul>
<li>Pharmaceuticals: Precursor for paraben preservatives in topical formulations.</li>
<li>Polymer Industry: Monomer for heat-resistant polyesters and liquid crystal polymers.</li>
<li>Cosmetics: Active ingredient in antimicrobial skin care products.</li>
</ul>
<h3>Precautions</h3>
<p>Store in cool, dry conditions away from oxidizers. Avoid inhalation; use appropriate PPE including respirators and gloves during handling to prevent respiratory irritation and skin sensitization.</p>