Characters and features: red powders, fine particle, in good dispersancy, good impenetrability to ultraviolet ray, stable in atmosphere and sunlight, good light resistance, good thermal endurance, good alkali resistance, dissolved only in hot strong acid.
Good alkali resistance, dissolved only in hot strong acid ,good thermal endurance;it begins to decompose into red pigment when losses water of crystalliza-tion under temperature higher than 150℃.
The stable bisphenol sodium salt solution prepared with the method of the invention has high thermal endurance, excellent colour and luster and the color of the makrolon is not damaged.
