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Accreditations & Associated Bodies

Our testing covers the prescribed and the unusual. Here at Nullifire, we regularly conduct fire testing to ensure that our products meet the requirements of standards and are globally recognised. 

All Nullifire fire stopping products are tested to the current standards including BS EN 1366-3 and BS EN1366-4. Check out our passive fire protection accreditations below and get in touch for more information.

What's It All About - BS EN 1366

BS EN 1366-3

BS EN 1366-3

The BS EN 1366-3 specifies a method of test for penetration seals to maintain the fire resistance of a separating element at the position at which it has been penetrated by a service (or services), through supporting constructions such as walls or floors. These simulate the interaction between the test specimen and the separating element into which the sealing system is to be installed in practice.

Penetration seals used to seal gaps around chimneys, air ventilation systems, fire rated ventilation ducts, fire rated service ducts, shafts and smoke extraction ducts as well as combined penetration seals are excluded from the EN 1366-3.

The purpose of a test described in this part of the EN 1366 series is to assess the integrity and insulation performance of:

  • the penetration seal;
  • the penetrating service (or services)
  • the separating element in the surrounding area of the penetration seal.
BS EN 1366-4

BS EN 1366-4

The EN 1366-4 specifies a method of test for linear joints fire-resistant seals.

Linear joint seals are positioned in joints, voids, gaps or other discontinuities within one or between two or more construction elements. Normally such openings are denoted as linear because their length is greater than their width - defined by a typical ratio of at least 10:1 in practice.

The purpose of the tests in this European Standard is to assess:

  • the effect of a linear joint seal on the integrity and insulation of the construction;
  • the integrity and insulation performance of the linear joint seal;
  • the effect of movement within the supporting construction on the fire performance of linear joint seals (optional)

Further Testing and Certifications



BS476 is a globally accepted standard British Standard that is used to determine the performance of structural building elements in the event of a fire, including steel framed buildings. The standard instructs how this should be carried out on critical elements, such as loadbearing beams and columns, as well as required unloaded specimens needed to build sufficient data to allow meaningful analysis. ASFP’s Yellow Book advises the minimum amount of data required to build an acceptable assessment of product performance as well as the governing principles used for the statistical analysis of the data, including a Criteria of Acceptability to ensure that a balanced approach is adopted rather than optimistic.

EN 13381

EN 13381

EN13381 is the European umbrella standard for the Fire Resistance of Structural Members which is growing in acceptance globally. Within this, specifically relating to intumescents are:

  • Concrete filled hollow steel columns – Part 6
  • Applied reactive protection to steel members – Part 8
  • Cellular beam protection – Part 9
  • Solid steel bars in tension – Part 10

EN13381-8 is the basic approval supporting commercial activity and is very similar to BS476 and ASFP Yellow Book governance of the absolute minimum requirements necessary to generate a product assessment that can be used commercially. However, it does go beyond the BS system in including



The Certifire scheme is an independent, or 3rd party, certification system for British Standard approvals that verifies the performance, quality, consistency and reliability of products and systems from initial design through to continued commercial supply via regular auditing and monitoring. This scheme can be used by anyone in the supply chain such as architects, contractors or, building owners to verify claims made around a product by checking the publicly available database. All Nullifire intumescents are listed to Certifire, or an equivalent system.

CE Marking

CE Marking

The letters ‘CE’ appear on many products traded on the extended Single Market in the European Economic Area (EEA). They signify that products sold in the EEA have been assessed to meet high safety, health, and environmental protection requirements. Of course, all our Nullifire products are CE marked as necessary.

For intumescents, the CE mark demonstrates that the systems have been evaluated and approved, through European Technical Approval, as fit for purpose for:

  • Fire performance and limitations
  • Durability capabilities
  • Approved systems
  • Reaction to fire classification

ETA validity and revision details can be checked here.