For professionals in the chemical and textile industries, a thorough understanding of product specifications is fundamental to making informed purchasing decisions. Vat Yellow 33 (CAS: 12227-50-8) is a well-regarded dyestuff, and as a manufacturer, NINGBO INNO PHARMCHEM is committed to transparency regarding its key technical attributes. This high-performance vat dye, known for its brilliant reddish-yellow hue, offers a compelling combination of properties that make it valuable for various applications, especially in textile dyeing and printing.

The primary specification for Vat Yellow 33 is its appearance: a Yellow Powder. This physical form is consistent across batches, indicating reliable processing and quality control. From a manufacturing standpoint, ensuring this consistent powder form is crucial for ease of handling and formulation by our clients. The chemical name is Vat Yellow 33, with synonyms such as Vat Yellow F3GC, and its Colour Index Number is C.I. Vat Yellow 33. The molecular formula is C54H32N4O6, and its molecular weight is approximately 832.86 g/mol. These identifiers are critical for cross-referencing and ensuring compatibility within diverse chemical processes.

Purity is another cornerstone specification. Our Vat Yellow 33 typically achieves an assay of ≥99.0% (anhydrous substance) or a purity of ≥99.0%. This high level of purity is essential for delivering consistent color strength and reliable performance. We also rigorously control other parameters like Loss on Drying (≤0.5%), Heavy Metals (≤10 ppm), and Sulphated Ash (≤0.2%). These specifications are vital for applications where even trace impurities can cause significant issues. For example, the low heavy metal content is important for environmental and safety compliance.

Fastness properties are perhaps the most critical functional specifications for dyestuffs. Vat Yellow 33 excels in this regard, offering excellent fastness to light (rated 5-6 for Xenon lamp testing), fastness to hypochlorite bleaching (4-5), and good wash fastness (4-5). These ratings mean that textiles dyed with our Vat Yellow 33 will retain their color vibrancy and integrity even under demanding conditions. For manufacturers and procurement specialists looking to buy Vat Yellow 33, these robust specifications assure them of a high-quality product that enhances the value and longevity of their end-use items. We invite you to contact NINGBO INNO PHARMCHEM to access our full technical documentation and discuss your specific needs.