BS 7904:1998

This standard BS 7904:1998 Guide to smoke measurement units. Their basis and use in smoke opacity test methods is classified in these ICS categories:

• 13.220.40 Ignitability and burning behaviour of materials and products

This British Standard describes the theory of optical measurement of smoke. It describes the different parameters measured, gives examples of the commonly used units, and describes relationships between different parameters. It also reviews some commonly used optical test methods for smoke measurement.

This standard is intended to describe the origins of the units used in the standards relating to measurement of smoke by optical methods, and any relationships between the units.