For B2B professionals in the chemical and manufacturing sectors, a deep understanding of product performance is crucial for making informed purchasing decisions. Solvent Red 149 (CAS 21295-57-8) is a sophisticated dye that owes its effectiveness to its carefully engineered chemical properties. As a specialist supplier, we aim to demystify these attributes for our clients, including research scientists and product developers.

At its core, Solvent Red 149 is a pyridine anthrone-type fluorescent dye. Its molecular formula, C23H22N2O2, and a molecular weight of approximately 358.43 g/mol, contribute to its solubility in various organic solvents and resins. This inherent solubility is fundamental to its application as a colorant in plastics, where it can be evenly dispersed within polymer matrices.

One of the most significant technical advantages of Solvent Red 149 is its exceptional heat resistance. With a melting point around 267.5°C and proven thermal stability up to 300°C, it can withstand the high processing temperatures common in the manufacturing of engineering plastics like polycarbonate (PC) and polyethylene terephthalate (PET). This ensures that the vibrant, fluorescent bluish-red color is maintained without degradation or undesirable side reactions.

Furthermore, its impressive light fastness, typically rated between 6 and 7 on a scale where 8 is the best, indicates that the color will remain stable and vibrant even when exposed to significant amounts of light over time. This is crucial for applications where product longevity and aesthetic consistency are critical. Procurement managers often look for these specific performance metrics when evaluating suppliers for their material needs. By understanding these technical details, potential buyers can better appreciate why Solvent Red 149 is a preferred choice and why sourcing from a reliable manufacturer is essential to obtain these precise specifications.