Agar is natural hydrophilic colloid extracted from various seaweed such as gracilaria and gelidium and its final product feature present as off-white dry powder form or strip form. Agar cannot be dissolved in cold water, but only be able to dissolve in boiled water.

Due to the unique gel property and stability of Agar, it has become not only one of the safest and indispensable additive in food industry which can be used as firming agent, thickening agent, stabilizing agent as well as emulsifying agent, but aslo boasts wide application in chemical industry and pharmaceutical industry as raw material for bacteria culture, carrier of microorganism.

Agar is a mixture of a neutral, dominating polysaccharide called "Agarose" and a charged polymer called "Agaropectin". The agarose is composed of (1-4) linked 3,6-anhydro -a- - L - galactose alternating with (1-3) linked - b - D - galactose.

As a soluable jelly,especially in boiled water Agar has two states: strip and powder.Even lowed the density to 1%, Agar can still be relatively stable jelly,thus has an important character in industry,being the necessary materials in Food Industry,Chemaical Industry and Medicine and Sience Research.