# Commission Delegated Regulation (EU) 2017/654 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery, Division 8.2.4.5: Stabilisation of PM samples

Extent: E+W+S+N.I.

To stabilise PM samples, they shall be placed in one or more containers that are open to the PM-stabilization environment, which is described in point 9.3.4.3.A PM sample is stabilized as long as it has been in the PM-stabilization environment for one of the following durations, during which the stabilization environment has been within the specifications of point 9.3.4.3:
(a) If it is expected that a filter's total surface concentration of PM will be greater than 0,353 μg/mm2, assuming a 400 μg loading on a 38 mm diameter filter stain area, the filter shall be exposed to the stabilization environment for at least 60 minutes before weighing;
(b) If it is expected that a filter's total surface concentration of PM will be less than 0,353 μg/mm2, the filter shall be exposed to the stabilization environment for at least 30 minutes before weighing;
(c) If a filter's total surface concentration of PM to be expected during the test is unknown, the filter shall be exposed to the stabilization environment for at least 60 minutes before weighing.

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VI/division/8/division/8.2/division/8.2.4/division/8.2.4.5 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VI/division-8/division-8.2/division-8.2.4/division-8.2.4.5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.