Solvent Red 135 is a benchmark high-performance solvent dye from the perinone class, known for its brilliant yellowish-red shade and exceptional heat stability. It is the industry standard for coloring polyethylene terephthalate (PET), particularly for bottles and food-contact applications (subject to regulation). Its excellent lightfastness and resistance to migration make it a top-tier choice for coloring a wide range of engineering plastics where performance is non-negotiable.