1. Food grade: As iron nutritional supplement, it is widely used in egg products, rice products and paste products, etc.
2. Ceramic grade: As raw materials of ceramic metal glaze, black glaze, antique glaze, etc.
3. Electronic/battery grade: It is used in the manufacture of cathode material of Lithium iron phosphate battery and electro-optic material, etc.

Qingdao Sigma Chemical Co., Ltd.is a global chemical industry manufacturers and suppliers of pharmaceuticals and intermediates, food and feed additives, herbal extracts, agrochemicals and fine chemicals etc.

The aim of Qingdao Sigma Chemical Co., Ltd is a quality policy that "Elements in the system all have been satisfied, Personnel has been trained; Every batch of material is checked, Each procedure guarantees the quality; Every bag of our products is top grade, Service is thoughtful all the time, quality and reputation to increase market share and promote enterprise development. The quality, colors and forms of our products have reached a high level in related chemical industry, which relies on characteristic and advanced processing technology and it has gained a high and reliable reputation from customers at both quality and services.