Commission Delegated Regulation (EU) 2026/331

Contents

Article 1 #

The classes of performance in relation to the essential characteristic reaction to fire of products shall be those set out in the Annex.

Article 2 #

This Regulation shall enter into force on the twentieth day following that of its publication in the Official Journal of the European Union.

A. symbols

For the purposes of this Annex, the following symbols apply:

For all classes
ΔΤ	temperature rise
Δm	mass loss
t_f	duration of flaming
PCS	gross calorific potential
LFS	lateral flame spread
SMOGRA	smoke growth rate
For all classes except for classes related to electric cables
FIGRA	fire growth rate
THR	total heat release
TSP	total smoke production
Fs	flame spread
For classes related to electric cables only
HRR_sm30, kW	heat release rate averaged by a 30-s sliding average
SPR_sm60, m²/s	smoke production rate averaged by a 60-s sliding average
Peak HRR, kW	maximum of HRR_sm30 between test start and end of test, excluded contribution from ignition source
Peak SPR, m²/s	maximum of SPR_sm60 between test start and end of test
THR₁₂₀₀, MJ	total heat release (HRR_sm30) from test start until end of test, excluded contribution from ignition source
TSP₁₂₀₀, m²	total smoke production (SPR_sm60) from test start until end of test
FIGRA, W/s	fire growth rate index defined as the highest value of the quotient between HRR_sm30 excluding the contribution of ignition source and time. Threshold values HRR_sm30 = 3 kW and THR = 0,4 MJ
FS	flame spread (damaged length)
H	flame spread

B. definitions

(1)‘material’ means a single basic substance or uniformly dispersed mixture of substances;

(2)‘homogeneous product’ means a product consisting of a single material, having uniform density and composition throughout the product;

(3)‘non-homogeneous product’ means a product that does not satisfy the requirements of a homogeneous product and that is composed of one or more components, substantial and/or non-substantial;

(4)‘substantial component’ means a material that constitutes a significant part of a non-homogeneous product. A layer with a mass per unit area ≥ 1,0 kg/m² or a thickness ≥ 1,0 mm is considered to be a substantial component;

(5)‘non-substantial component’ means a material that does not constitute a significant part of a non-homogeneous product. A layer with a mass per unit area < 1,0 kg/m² and a thickness < 1,0 mm is considered to be a non- substantial component. Two or more non-substantial layers that are adjacent to each other, where there are no substantial components in between the layers, are considered as one non-substantial component and are classified in accordance with the criteria for a layer that is a non-substantial component;

(6)‘internal non-substantial component’ means a non-substantial component that is covered on both sides by at least one substantial component;

(7)‘external non-substantial component’ means a non-substantial component that is not covered on one side by a substantial component.

For the purposes of this Annex the following definitions apply:

C. classes of performance in relation to the essential characteristic reaction to fire of products

General

The relevant definitions, tests and performance criteria are fully described or referenced in the relevant harmonised technical specifications, European assessment documents, European reaction to fire classification standards and European testing standards.

1. Products excluding floorings, linear pipe thermal insulation products, and electric cables

Table 1
Class	Test method(s)	Classification criteria	Additional classification
A1	Non-combustibility test^note;and	ΔΤ ≤ 30 °C;andΔm ≤ 50 %;andt_f = 0 (that is to say, no sustained flaming).
Heat of combustion test	PCS ≤ 2,0 MJkg^-1^note;andPCS ≤ 2,0 MJkg^-1^note^note;andPCS ≤ 1,4 MJm^-2^note;andPCS ≤ 2,0 MJkg^-1^note.
A2	Non-combustibility test^note;or	ΔΤ ≤ 50 °C;andΔm ≤ 50 %;andt_f ≤ 20 s.
Heat of combustion test;and	PCS ≤ 3,0 MJkg^-1^note;andPCS ≤ 4,0 MJm^-2^note;andPCS ≤ 4,0 MJm^-2^note;andPCS ≤ 3,0 MJkg^-1^note.
Single burning item test).	FIGRA_0,2MJ ≤ 120 Ws^-1;andLFS < edge of specimen;andTHR_600s ≤ 7,5 MJ.	Smoke production^note;andFlaming droplets/particles^note.
B	Single burning item test;and	FIGRA_0,2MJ ≤ 120 Ws^-1;andLFS < edge of specimen;andTHR_600s ≤ 7,5 MJ.	Smoke production^note;andFlaming droplets/particles^note.
Ignitability test^note:Exposure = 30 s.	Fs ≤ 150 mm within 60 s.
C	Single burning item test;and	FIGRA_0,4MJ ≤ 250 Ws^-1;andLFS < edge of specimen;andTHR_600s ≤ 15 MJ.	Smoke production^note;andFlaming droplets/particles^note.
Ignitability test^note:Exposure = 30 s.	Fs ≤ 150 mm within 60 s.
D	Single burning item test;and	FIGRA_0,4MJ ≤ 750 Ws^-1.	Smoke production^note;andFlaming droplets/particles^note.
Ignitability test^note:Exposure = 30 s.	Fs ≤ 150 mm within 60 s.
E	Ignitability test^note:Exposure = 15 s.	Fs ≤ 150 mm within 20 s.	Flaming droplets/particles^note
F	Ignitability test^note:Exposure = 15 s.	Fs > 150 mm within 20 s.

2. Floorings

Table 2
Class	Test method(s)	Classification criteria	Additional classification
A1_FL	Non-combustibility test^note;and	ΔΤ ≤ 30 °C;andΔm ≤ 50 %;andt_f = 0 (that is to say, no sustained flaming).
Heat of combustion test.	PCS ≤ 2,0 MJkg^-1^note;andPCS ≤ 2,0 MJkg^-1^note;andPCS ≤ 1,4 MJm^-2^note;andPCS ≤ 2,0 MJkg^-1^note.
A2_FL	Non-combustibility test^note;or	ΔΤ ≤ 50 °C;andΔm ≤ 50 %;andt_f ≤ 20 s.
Heat of combustion test;and	PCS ≤ 3,0 MJkg^-1^note;andPCS ≤ 4,0 MJm^-2^note;andPCS ≤ 4,0 MJm^-2^note;andPCS ≤ 3,0 MJkg^-1^note.
Determination of the burning behaviour using a radiant heat source test^note.	Critical flux^note ≥ 8,0 kWm^-2.	Smoke production^note.
B_FL	Determination of the burning behaviour using a radiant heat source test^note;and	Critical flux^note ≥ 8,0 kWm^-2.	Smoke production^note.
Ignitability test^note:Exposure = 15 s.	Fs ≤ 150 mm within 20 s.
C_FL	Determination of the burning behaviour using a radiant heat source test^note;and	Critical flux^note ≥ 4,5 kWm^-2.	Smoke production^note.
Ignitability test^note:Exposure = 15 s.	Fs ≤ 150 mm within 20 s.
D_FL	Determination of the burning behaviour using a radiant heat source test^note;and	Critical flux^note ≥ 3,0 kWm^-2.	Smoke production^note.
Ignitability test^note:Exposure = 15 s.	Fs ≤ 150 mm within 20 s.
E_FL	Ignitability test^note:Exposure = 15 s.	Fs ≤ 150 mm within 20 s.
F_FL	Ignitability test^note:Exposure = 15 s.	Fs > 150 mm within 20 s.

3. Linear pipe insulation products

Table 3
Class	Test method(s)	Classification criteria	Additional classification
A1_L	Non-combustibility test^note;and	ΔΤ ≤ 30 °C;andΔm ≤ 50 %;andt_f = 0 (that is to say, no sustained flaming).
Heat of combustion test.	PCS ≤ 2,0 MJkg^-1^note;andPCS ≤ 2,0 MJkg^-1^note;andPCS ≤ 1,4 MJm^-2^note;andPCS ≤ 2,0 MJkg^-1^note.
A2_L	Non-combustibility test^note;or	ΔΤ ≤ 50 °C;andΔm ≤ 50 %;andt_f ≤ 20 s.
Heat of combustion test;and	PCS ≤ 3,0 MJkg^-1^note;andPCS ≤ 4,0 MJm^-2^note;andPCS ≤ 4,0 MJm^-2^note;andPCS ≤ 3,0 MJkg^-1^note.
Single burning item test.	FIGRA_0,2MJ ≤ 270 Ws^-1;andLFS < edge of specimen;andTHR_600s ≤ 7,5 MJ.	Smoke production^note;andFlaming droplets/particles^note.
B_L	Single burning item test;and	FIGRA_0,2MJ ≤ 270 Ws^-1;andLFS < edge of specimen;andTHR_600s ≤ 7,5 MJ.	Smoke production^note;andFlaming droplets/particles^note.
Ignitability test^note:Exposure = 30 s.	Fs ≤ 150 mm within 60 s.
C_L	Single burning item test;and	FIGRA_0,2MJ ≤ 460 Ws^-1;andLFS < edge of specimen;andTHR_600s ≤ 15 MJ.	Smoke production^note;andFlaming droplets/particles^note.
Ignitability test^note:Exposure = 30 s.	Fs ≤ 150 mm within 60 s.
D_L	Single burning item test;and	FIGRA_0,4MJ ≤ 2 100 Ws^-1;andTHR_600s ≤ 100 MJ.	Smoke production^note;andFlaming droplets/particles^note.
Ignitability test^note:Exposure = 30 s.	Fs ≤ 150 mm within 60 s.
E_L	Ignitability test^note:Exposure = 15 s.	Fs ≤ 150 mm within 20 s.	Flaming droplets/particles^note.
F_L	Ignitability test^note:Exposure = 15 s.	Fs > 150 mm within 20 s.

4. Electric cables

Table 4
Class	Test method(s)	Classification criteria	Additional classification
A_ca	Heat of combustion test.	PCS ≤ 2,0 MJkg^-1^note.
B1_ca	Burning behaviour and smoke production of bunched cable test (30 kW flame source);and	FS ≤ 1,75 m;andTHR_1200s ≤ 10 MJandPeak HRR ≤ 20 kWandFIGRA ≤ 120 Ws^-1.	Smoke production^note^note;andFlaming droplets/particles^note;andAcidity (pH and conductivity)^note.
Vertical flame spread of single cable test.	H ≤ 425 mm.
B2_ca	Burning behaviour and smoke production of bunched cable test (20,5 kW flame source);and	FS ≤ 1,5 m;andTHR_1200s ≤ 15 MJandPeak HRR ≤ 30 kWandFIGRA ≤ 150 Ws^-1.	Smoke production^note^note;andFlaming droplets/particles^note;andAcidity (pH and conductivity)^note.
Vertical flame spread of single cable test.	H ≤ 425 mm.
C_ca	Burning behaviour and smoke production of bunched cable test (20,5 kW flame source);and	FS ≤ 2,0 m;andTHR_1200s ≤ 30 MJ;andPeak HRR ≤ 60 kW;andFIGRA ≤ 300 Ws^-1.	Smoke production^note^note;andFlaming droplets/particles^note;andAcidity (pH and conductivity)^note.
Vertical flame spread of single cable test.	H ≤ 425 mm.
D_ca	Burning behaviour and smoke production of bunched cable test (20,5 kW flame source);and	THR_1200s ≤ 70 MJ;andPeak HRR ≤ 400 kW;andFIGRA ≤ 1300 Ws^-1.	Smoke production^note^note;andFlaming droplets/particles^note;andAcidity (pH and conductivity)^note.
Vertical flame spread of single cable test.	H ≤ 425 mm.
E_ca	Vertical flame spread of single cable test.	H ≤ 425 mm.
F_ca	Vertical flame spread of single cable test.	H > 425 mm.