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The membrane filters, including paper separators, coating or backing materials, etc., that are

present in carriage, shall not be liable to propagate a detonation as tested by one of the tests

described in the Manual of Tests and Criteria, Part I, Test series 1 (a).

In addition the competent authority may determine, on the basis of the results of suitable

burning rate tests taking account of the standard tests in the Manual of Tests and Criteria, Part

III, sub-section 33.2.1, that nitrocellulose membrane filters in the form in which they are to be

carried are not subject to the requirements applicable to flammable solids in Class 4.1.