This specification covers the design and dimensional requirements for flasks and closures, with a fixed platinum sample holder, used in the original oxygen-flask combustion procedures.

1.1 This specification covers the flask and closure, with a fixed platinum sample holder, used in the original oxygen-flask combustion procedures (, ).Note 1This specification was originally developed by the Committee on Microchemical Apparatus, Division of Analytical Chemistry, American Chemical Society (). Specifications for types of apparatus that utilize electric (, ) or infrared ()ignition are not included because of lack of experience with these.