焦性没食子酸

性状：白色有光泽结晶。无气味。在露光的空气中变成浅灰色。密封避光保存。

相对分子质量：126.11

技术条件
熔点范围，°C                                                               130.0~133.0                        
                                杂质最高含量（以%计）
水不溶物                                                                        0.10
灼烧残渣（以硫酸盐计）                                                0.025
氯化物（Cl）                                                                 0.002
硫酸盐（SO4）                                                             0.002  
铁(Fe)                                                                           0.015
没食子酸                                                                       合格