Hunan king-swallow chemical co; ltd is a domestic and super-huge lithopone manufacturer . Annual production is nearly 40,000 tons, the company has had self-operation export and import right, the company have already through ISO9002 quality system authentication , the company produces the factory products and provides the tax invoice of hyperplasia in full, the company participates in the formulation of the lithopone national standard, product quality is superior to the national standard.