Test method for the determination of oxygen index of insulating liquids Ingestion-build-264231 BS 2061 also provides you

BS 2061 also provides you with dimension specifications for single-coil square section spring washers

helical (skew)

They were limited to tabulations of:

An AACM (including the activator) may contain Portland cement only at a content of less than 5% mass of binder solids and may contain subsidiary constituents not exceeding 25% of the mass of the cementitious material

promotion and standardization of the use of nomadic and portable devices to support ITS service provisions and multimedia use such as passenger information

Test method for the determination of oxygen index of insulating liquids Ingestion-build-264231 BS 2061 also provides you