For professionals in the chemical and pharmaceutical industries, the procurement of raw materials like 4-Aminobenzoic Acid (PABA), CAS 150-13-0, is a critical process where quality reigns supreme. PABA's dual role as a pharmaceutical intermediate and a cosmetic ingredient necessitates stringent quality control. Understanding the key quality parameters and how to verify them is paramount for ensuring the success and compliance of downstream products. As a committed manufacturer and supplier, we emphasize the importance of these parameters for our global clientele.

Essential Quality Parameters for PABA

When evaluating 4-Aminobenzoic Acid from potential suppliers, buyers should focus on the following critical quality indicators:

• Assay (Purity): This is the most crucial parameter. For pharmaceutical applications and demanding chemical syntheses, PABA should ideally have an assay of ≥99.0%, often verified by titration or HPLC. For less critical applications, slightly lower purities might be acceptable, but clarity on specifications is vital.
• Appearance: PABA is typically described as a White crystalline powder. Any significant deviation in color (e.g., off-white, yellowish, or greyish) without a clear explanation in the specification can be a red flag and warrants further investigation.
• Melting Point: The reported melting point range for PABA is generally 186-189°C. A narrow melting point range indicates higher purity and consistency. Buyers should check if the product falls within this specified range.
• Solubility: PABA's solubility characteristics (e.g., soluble in hot water, ethyl ether, ethanol; insoluble in water, benzene) are important for formulation and processing. This is usually confirmed through general description rather than a specific quantitative test unless required for a particular application.
• Loss on Drying (Moisture Content): Typically specified as ≤0.5% or lower, this parameter indicates the amount of water or volatile matter present. High moisture content can affect product stability and reaction yields.
• Impurities: Specific impurity limits, such as for 2-Aminobenzoic Acid and 3-Aminobenzoic Acid, are crucial, especially for pharmaceutical grades. Suppliers should provide data on these or other relevant impurities as per pharmacopoeial standards if applicable.

The Role of Certificates of Analysis (COA)

A comprehensive Certificate of Analysis (COA) from the 4-Aminobenzoic Acid manufacturer is indispensable. It serves as a documented proof that the batch meets the stated specifications. Buyers should always request and carefully review the COA before making a purchase decision. It should clearly list the tested parameters and their corresponding results.

Choosing a Reliable Supplier

When you look to buy 4-Aminobenzoic Acid, partnering with a reputable 4-Aminobenzoic Acid supplier is key. We, as a dedicated manufacturer in China, pride ourselves on delivering PABA that meets stringent quality standards. We provide detailed specifications and COAs for all our products. Feel free to contact us for PABA pricing and to discuss your quality assurance needs. Ensuring the quality of your raw materials is a direct investment in the quality of your final products.

Focusing on these key quality parameters ensures that your procured 4-Aminobenzoic Acid will perform as expected, contributing to successful product development and manufacturing.