OB-1 is a high-performing whitening agent engineered for the rigid plastics industry. Featuring an excptional melting point of 359 degrees Celsius, it offers superior thermal stability for high temperature processing while delivering a powerful whitening effect that imparts a brilliant blue white shade to finished products. Its high excitation efficiency requires a very low dosage to achieve optimal results, making it a highly cost-effective solution for manufacturers seeking consistent, high-quality brightness.