1. Standards and Classifications
Osmose FirePRO fire retardant treated wood products (FRTW) have been tested to BS EN 13501-1:2002 "Fire Classification of Construction Products and Building Elements".

These tests are commonly referred to as 'reaction to fire tests'. Reaction to fire tests are commonly called up in regulations of both the building and transport sectors. The classifications of flammability are detailed in the table below along with the UK transpositions of the more traditional BS476 Classifications.

Classification: (European)	BS476 UK Transpositions
A1	Non-Combustible
A2	Very Limited Combustibility
B	Class 0
C	Class 1
D	Class 3

Treated with Osmose FirePRO, timber and wood based panels can achieve either Class B or Class C. Osmose FirePro is suitable for treatment to WPA Fire Retardant Commodity Specifications FR1, FR2, FR3 and FR4.

2. Specification Clauses and Codes:
Treatment Specification Codes for Osmose FirePRO:

Specification Code	Euro Class	Typical Component
5PFC1	C	3.6 mm Plywood
5PFC2	C	5.5mm Plywood
5PFC3	C	9.9mm Plywood
5PFC4	C	12mm Plywood
5PFC5	C	15mm Plywood
5PFC6	C	18mm Plywood
5PFC7	C	21mm Plywood
5PFC8	C	24mm Plywood
5PFC9	C	Timber (Any dimension)
5PFC1	B	3.6 mm Plywood
5PFC2	B	5.5mm Plywood
5PFC3	B	9.9mm Plywood
5PFC4	B	12mm Plywood
5PFC5	B	15mm Plywood
5PFC6	B	18mm Plywood
5PFC7	B	21mm Plywood
5PFC8	B	24mm Plywood
5PFC9	B	Timber (Any dimension)

Model Specification Clause: The material as detailed (insert quantity, material, species) to be treated to (Euroclass B or C) using a WPA Type HR humidity resistant process to the specification code (see above).

Note: For more information on WPA (Wood Protection Association) Treatment Types and Specifications please contact us. A supplement to Building Regulations Approved Document B has been issued to include Euroclasses for fire performance alongside the British classifications. The UK transpositions are:
Euroclass C - - - UK Class 1
Euroclass B - - - UK Class 0