6.1 Progressive smouldering
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.688(17) – Fire Test Procedures for Ignitability of Bedding Components – (Adopted on 6 November 1991) - Annex - Recommendation on Fire Test Procedures for Ignitability of Bedding Components - 6 Criteria for Ignitability - 6.1 Progressive smouldering

6.1 Progressive smouldering

 For the purpose of this test method, all the types of behaviour described below in .1 to .5 are considered to be progressive smouldering ignition:

  • .1 any test specimen that produces externally detectable amounts of smoke, heat or glowing after a period of one hour following the application of the ignition source;

  • .2 any test specimen that displays escalating combustion behaviour so that it is unsafe to continue the test and requires forcible extinction;

  • .3 any test specimen that smoulders until it is essentially consumed within the duration of the test;

  • .4 any test specimen that smoulders to the extremities of the specimen, viz. to either side or to the full thickness of the specimen, within the duration of the test. However, all materials having a thickness of 25 mm or less, such as light mattresses, quilts and blankets are allowed to smoulder to the full thickness of the specimen;

  • .5 any test specimen that, on final examination, shows evidence of smouldering other than discoloration more than 25 mm in any horizontal direction from the nearest part of the original position of the edge of cotton wool pad and open flame ignition source.

Parent topic: 6 Criteria for Ignitability
Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.