For procurement specialists and R&D scientists in the chemical, pharmaceutical, and dye industries, understanding the detailed specifications of raw materials is critical. 4-Aminophenol (also known as p-Aminophenol, CAS 123-30-8) is a fundamental organic intermediate, and its quality directly impacts the success of downstream applications. This guide aims to demystify the key specifications that buyers should look for when sourcing this vital compound, highlighting what makes a supplier like us a reliable partner.

Appearance: The First Indicator of Quality

The visual appearance of a chemical can often provide an initial clue about its purity and handling. 4-Aminophenol is typically described as 'Cream white Crystallization' or a similar off-white crystalline powder. Significant deviation from this description, such as a strong yellow or brown color, might indicate oxidation or the presence of impurities. While minor color variations can occur due to slight oxidation upon exposure to air, consistent cream white crystallization is a hallmark of good quality material.

Assay and Purity: The Core of the Specification

The assay indicates the percentage of the desired compound present in the sample. For 4-Aminophenol, a standard minimum assay is often listed as ≥97.0%. However, for demanding applications, particularly in pharmaceutical synthesis, higher purity levels are essential. Many suppliers, including ourselves, offer grades with assay values up to 99.80%. This high purity minimizes the presence of potentially interfering byproducts, ensuring more efficient reactions and a cleaner final product. When you buy 4-Aminophenol, always verify the guaranteed assay and consult the Certificate of Analysis (CoA) for lot-specific purity data.

Key Impurities to Monitor

Beyond the overall assay, understanding and controlling specific impurities is crucial. Common impurities in 4-Aminophenol can include:

  • O-Aminophenol: An isomer that can affect reaction selectivity.
  • 4-Nitrophenol: A potential precursor or byproduct, its presence needs to be minimized.
  • Sodium Metabisulfite: Sometimes present as a residual from manufacturing processes, its content needs to be controlled.
  • Moisture (Loss on Drying): Excessive moisture can affect accurate weighing and reaction stoichiometry.

Reputable manufacturers will clearly state the limits for these critical impurities in their specifications and provide lot-specific data on the CoA. As a trusted 4-Aminophenol supplier, we meticulously control these parameters.

Other Important Specifications

Depending on the application, other specifications might be relevant:

  • Identification: Typically confirmed via IR spectroscopy.
  • Ferrous Content: Important for certain catalytic processes or where metal contamination is a concern.
  • Solubility: While slightly soluble in water, its solubility in alcohols and other solvents is relevant for formulation and reaction setup.

Why Choose Our 4-Aminophenol?

As a dedicated manufacturer and supplier of 4-Aminophenol from China, we are committed to providing materials that meet and exceed industry expectations. We ensure our product adheres to stringent specifications, backed by comprehensive CoAs and reliable supply chains. We understand the importance of consistent quality for our clients' success.

For procurement managers and scientists seeking dependable 4-Aminophenol, we invite you to learn more about our product. Contact us to buy 4-Aminophenol and experience the assurance of quality and service.