A given respiratory protective device can only be approved when the individual components satisfy therequirements of the test specification which may be a complete standard or part of a standard, and practicalperformance tests have been carried out successfully on complete apparatus where specified in the appropriatestandard. If for any reason a complete apparatus is not tested then simulation of the apparatus is permittedprovided the respiratory characteristics and weight distribution are similar to those of the complete apparatus.1 ScopeThis European Standard specifies particle filters for use as components in unassisted respiratory protectivedevices with the exception of escape apparatus and filtering facepieces.Laboratory tests are included for the assessment of compliance with the requirements.Some filters complying with this European Standard may also be suitable for use with other types of respiratoryprotective devices and, if so, shall be tested and marked according to the appropriate European Standard.