虫白蜡是雄性白蜡的幼虫在生长过程中所分泌的蜡，是天然蜡中白的一种，其附着于树干上的状态看起来就像积雪一样，经精制而成，国际称“中国虫蜡”，简称“川蜡”。一般称为虫蜡、白蜡、川蜡、雪蜡或中国蜡。自古以来被人们用于制造蜡烛及作为中药的原辅料。本品呈块状，白色或类白色，表面平滑或稍有争状，具光泽、体轻、质硬而稍脆，搓捻则粉碎。断面呈马牙状或米心状。
“川蜡 毛蜡”其他说明
项目                                                                          理化指标                      
颜色                                                                      白色或类白色
表面                            表面平滑，或稍有皱纹，具有光泽、体轻质硬，而稍脆搓捻则粉碎
断面                                                           断面呈条状或颗粒状
气味                                                                 气微、无味
熔点                                                                         81-85℃
酸值                                                                            0.8
皂化值                                                                          70-92
碘值                                                                             6-9
比重                                                                         0.95-0.965
苯不容物                                                                           0.8