Agar is polysaccharide extracted from seaweed, which is one of the world's most widely used seaweed gel. Agar is hydrophilic colloid, white or similar white powder or strip products. It is insoluble in cold water and soluble in boiling water which is clear liquid, when cooled to 34 to 43 ℃to form a solid gel, and it cannot melt when heated below 85 ℃. So it is one of the best curing agent for solid medium. Agar solid culture medium, can be used for high temperature culture without melting, vaccination after solidification, also from cultures burned to death. Therefore, Agar is the most widely used in the preparation of various biological medium，it also used in mold material. The agar produced in our company has high gel strength, good elasticity, low sulfate, low EEO and high transparency. Purified agar has Low sulphate, used for high-end Tissue culture.