根据不同的制造方法，指定四种主要的机制虫胶。每种类型都是根据颜色分级的。不溶于热酒精的物质的要求与可选要求一起给出:挥发物、蜡、灰分、铅和砂砾含量、可溶于水的物质、碘值和酸值、热聚合和流动试验。

Specifies four main types of machine-made shellac based on different methods of manufacture. Each type is graded on the basis of colour. Requirements for matter insoluble in hot alcohol are given along with optional requirements for: volatile matter, wax, ash, lead and grit content, matter soluble in water, iodine and acid values, heat polymerisation and flow tests.