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Fire Retardant OSB

Oriented Strand Board treated with a fire retardant solution during production.

Our stocks of Fire Retardant OSB are sourced from SmartPly. The boards are treated with a Zeroignition® Solution, which is a water-based and eco-friendly fire retardant. This ensures that the structure of the board is not compromised and the product maintains a full CE Mark following treatment.

FR OSB/3 panels are suitable for interior, structural use in conditions where humidity may fluctuate. SmartPly produce MAX FR B, a flame retardant OSB3 panel with Euroclass B rating which we stock.

Typical Applications
  • Roofing
  • Flooring
  • Wall sheathing
  • Furniture
  • Shop fitting
  • General Joinery
  • Exhibition stands
  • Site Hoarding
Applicable Standards
  • BS EN 300 – OSB definition, classification and specification.
  • BS EN 13501-1 – Single Burning Item Test
  • EN ISO 11925 – Ignitability test.
  • European Class B Fire Ratings

Hanson Plywood sources Fire Retardant OSB from FSC® Certified forest concessions from the UK and Republic of Ireland. The company’s robust Chain of Custody management system ensures that these certifications are respected and adhered to throughout the supply chain. For further information, please refer to our Environment Page.

Quick Reference Guide - OSB
Application & Climatic Conditions
Use Class (EN 335)
Non-Structural, interior fitments including furniture
Use Class 1
Internal, structural applications
Use Class 1
Structural applications similar to those listed above, however OSB/3 is is suitable for use in humid conditions
Use Class 1 & 2
Heavy-duty structural applications in humid conditions
Use Class 1 & 2
Quick Reference Guide – Fire Ratings

A request we commonly receive is that for a panel with a 1 hour or ½ hr fire rating.

30 or 60mins relates to the concept of Fire Resistance and typically relates to the ability of an elevation or door to withstand the passage of a fully developed fire for said amount of time.

Euroclass relates to the concept of Reaction to Fire and focuses on initial fire growth phase. A Euroclass rated panel may form part of a fire barrier system requiring 30 or 60 mins Fire Resistance overall. We recommend that suitability of a Euroclass rated panel within the design is based upon 3rd party assessment or independent testing specific to the project in question.

There are 7 Euroclass classifications ranging from A1 to F. In line with the Construction Products Regulation (2013) each Euroclass rating requires testing against the relevant European fire test methods – see table below.

Hanson Plywood offer a range of panels manufactured with an A1 rating (see below). Untreated wood-based panels such as plywood, OSB, MDF & Chipboard typically achieve a Euroclass D or E rating. Fire rated panels can be supplied to a Euroclass B or Euroclass C fire performance as required depending upon regulatory requirements.

Performance description
National Class (England & Wales)
National Test Standard (England & Wales)
BS EN ISO 1182
BS EN ISO 1716
BS 476: Part 4
BS EN ISO 1182
BS EN ISO 1716
BS EN 13823
Limited combustibility
BS 476: Part 11
BS EN 13823
BS EN 11925-2
BS 476: Part 6
BS 476: Part 7
Bfl (Flooring only)
EN ISO 9239-1
EN ISO 11925-2
BS EN 13823
BS EN 11925-2
1 & 2
BS 476 : Part 7
BS EN 13823
BS EN 11925-2
BS 476: Part 7
BS EN 11925-2
BS 476 : Part 7
No performance determined
No Test
2397mm x 1197mm
FR OSB/3 Euroclass B
for further information or a quotation please fill out the form or call us on 01422 330 444

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