In the dynamic field of chemical analysis, specific reagents play pivotal roles in achieving accurate and reliable results. Cresol Purple (CAS 2303-01-7) is one such compound, widely recognized as a versatile pH indicator. For scientists, researchers, and procurement specialists, understanding its properties and applications, as well as the best channels to purchase it, is essential for operational success.

Cresol Purple, also known as m-Cresol Purple, is a sulfonphthalein dye with the molecular formula C21H18O5S. It typically appears as a purple to dark purple crystalline powder. Its primary function in laboratories is as an acid-base indicator, capable of signaling pH changes across two distinct ranges. In acidic conditions, it transitions from red at pH 1.2 to yellow at pH 2.8. In alkaline conditions, it changes from yellow at pH 7.6 to purple at pH 9.2. This dual functionality makes it particularly useful for detecting the alkalinity of water and for various analytical tests.

For R&D scientists and product formulators, the reliability of Cresol Purple is paramount. When looking to buy this chemical, quality assurance is a major consideration. Buyers typically seek products with a purity of ≥98%, low residue on ignition (≤0.2%), and minimal loss on drying (≤0.5%). These specifications ensure that the indicator will perform predictably in sensitive experiments and formulations, preventing deviations in analytical outcomes.

Procurement managers often look to Chinese manufacturers and suppliers for Cresol Purple due to competitive pricing and established supply chains. Sourcing directly from a manufacturer can provide advantages in terms of bulk ordering, consistent quality control, and responsive customer service. Understanding the typical packaging, such as 25KG drums, and the ability for customization can also be beneficial for industrial users.

Ultimately, whether you are conducting environmental water analysis, performing complex chemical titrations, or developing new formulations, Cresol Purple is a valuable tool. For those seeking to purchase this indicator, identifying a reliable manufacturer and supplier that can consistently provide high-purity product at a competitive price is key. Engaging with experienced chemical companies will ensure you acquire the quality reagent necessary for your critical applications.