Language

Protective clothing against heat and flames

Specification standards: remarks and possible actions

EN ISO 11611: Protective clothing for use in welding and allied processes
EN ISO 11612: Protective clothing - Clothing to protect against heat and flame
EN ISO 14116: Protective clothing - Protection against heat and flame - Limited flame spread materials, material assemblies and clothing

  • Although these three standards have one or more parameters/requirements in common, they may be mutually divergent. All three standards will now be revised at the same time in order to create uniform parameters on tensile strength, tear strength, bursting strength, pre-treatment, evaluation of hardware...
  • The CEN consultant has emphasized that a revision mainly has to be carried out on the basis of the anticipated risks, even if this leads to divergent methods/requirements. Because these standards are common EN-ISO standards, the opinions and input of ISO have to be taken into account.

Important knowledge

  • The views on the “Electrical resistance” parameter included in EN ISO 11611 differ greatly. This parameter is not included in Annex ZA of the standard which refers to the essential requirements of the directive. This has surprised quite a few members but also the CEN consultant has second thoughts about the usefulness of this parameter.
  • Just like the previous time, the discussion was mainly focused on the heat resistance test at 260°C mentioned in EN ISO 11612. The convenor has once again underlined that it is a full option and that no material has to be tested at this high temperature. He admits, however, that the English text is not very clear, whereas the French version is much more precise. The WG will ask VG5 to treat this most urgently.

These issues will of course be discussed during the revision of the standards.

ISO 469: Protective clothing - Protection against heat and flame - Limited flame spread materials, material assemblies and clothing
A project group prepares the revision of this standard. A draft document is expected mid 2010.

Test methods: remarks and possible actions

  • ISO 9150 / EN 348 - impact of small splashes of molten metal
    The current sensor and sensor block are no longer produced. A possible alternative is a UK made sensor. Three labs, including Centexbel, will run comparative tests as soon as possible. The meeting has reaffirmed the urgency to amend and possibly revise the standard.
  • EN ISO 9185 - test with molten metal
    The search of an alternative method using a calorimeter instead of a PVC skin simulation is on hold for the time being.

Meeting in Saint-Denis 12/13 November 2009