单宁酸

分子式及分子量：C₇₆H₅₂O₄₆  1701.18

性状：淡黄色或浅棕色无定型粉末;暴露至空气中氧化、颜色加深，无臭、有涩味。溶于水、乙醇、丙酮、乙酸乙酯。

规格：产品符合国家标准GB5308-85（工业级标准）。食用级标准

   质量规格：

    单宁酸含量：≥ 81%；88%；93%；96%；98%

    
      Usage: main material of gallic acid, , sulfanilamide medicine; extract gallic acid and pyrogallol in chemical industry. mud treater in petroleum drilling; furthermore, it can be used in the production of tan-reagent of leather, polygenetic dye, rubber concretion, albumen reagent, alkaloid precipitator, mill run inhibitor,wine-clarifier,  the germanium extraction, ink confect and so on

 贮藏：防潮避光，密封贮存。

溶于水及乙醇，易溶于甘油，极不溶于乙醚、氯仿或苯。其水溶液与铁盐溶液相遇变蓝黑色，加亚硫酸钠可延缓变色