Commission Delegated Regulation (EU) 2026/331 of 13 February 2026 supplementing Regulation (EU) 2024/3110 of the European Parliament and of the Council by determining classes of performance in relation to the essential characteristic reaction to fire

Official Journal EN of the European Union L series 2026/331 21.4.2026 COMMISSION DELEGATED REGULATION(EU) 2026/331 of 13 February 2026 supplementing Regulation (EU) 2024/3110 of the European Parliament and of the Council by determining classes of performance in relation to the essential characteristic reaction to fire (Text with EEA relevance) THE EUROPEAN COMMISSION, Having regard to the Treaty on the Functioning of the European Union, Having regard to Regulation (EU) 2024/3110 of the European Parliament and of the Council of 27 November 2024 laying down harmonised rules for the marketing of construction products and repealing Regulation (EU) No 305/2011(1), and in particular Article 5(5), third subparagraph thereof, Whereas: (1) In order to enable manufacturers to declare sufficiently detailed classes of performance of products within the harmonised zone established pursuant to Article 11 of Regulation (EU) 2024/3110, it is necessary to establish classes of performance that are aligned to the latest technological and market developments. (2) Classes of performance in relation to the essential characteristic reaction to fire were established by Commission Delegated Regulation (EU) 2016/364(2) on the basis of Regulation (EU) No 305/2011 of the European Parliament and of the Council(3). However, those classes of performance are not applicable under Regulation (EU) 2024/3110. Therefore, in order to keep the continuity of the system, the CPR Acquis Expert Group advised the Commission to establish the same classes of performance set out by Delegated Regulation (EU) 2016/364. (3) The Commission should therefore determine the classes of performance to be used for the declaration of the essential characteristic reaction to fire, HAS ADOPTED THIS REGULATION: 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. (1) OJ L, 2024/3110, 18.12.2024, ELI: http://data.europa.eu/eli/reg/2024/3110/oj. (2) Commission Delegated Regulation (EU) 2016/364 of 1 July 2015 on the classification of the reaction to fire performance of construction products pursuant to Regulation (EU) No 305/2011 of the European Parliament and of the Council (OJ L 68, 15.3.2016, p. 4, ELI: http://data.europa.eu/eli/reg_del/2016/364/oj). (3) Regulation (EU) No 305/2011 of the European Parliament and of the Council of 9 March 2011 laying down harmonised conditions for the marketing of construction products and repealing Council Directive 89/106/EEC (OJ L 88, 4.4.2011, p. 5, ELI: http://data. europa.eu/eli/reg/2011/305/oj). ELI: http://data.europa.eu/eli/reg_del/2026/331/oj 1/10EN OJ L, 21.4.2026 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. This Regulation shall be binding in its entirety and directly applicable in all Member States. Done at Brussels, 13 February 2026. For the Commission The President Ursula VON DER LEYEN 2/10 ELI: http://data.europa.eu/eli/reg_del/2026/331/ojEN OJ L, 21.4.2026 ANNEX A. SYMBOLS For the purposes of this Annex, the following symbols apply: For all classes ΔΤ temperature rise Δm mass loss t duration of flaming f 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 , kW heat release rate averaged by a 30-s sliding average sm30 SPR , m2/s smoke production rate averaged by a 60-s sliding average sm60 Peak HRR, kW maximum of HRR between test start and end of test, excluded contribution from sm30 ignition source Peak SPR, m2/s maximum of SPR between test start and end of test sm60 THR , MJ total heat release (HRR ) from test start until end of test, excluded contribution from 1200 sm30 ignition source TSP , m2 total smoke production (HRR ) from test start until end of test 1200 sm60 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 = 3 kW sm30 and THR = 0,4 MJ FS flame spread (damaged length) H flame spread B. DEFINITIONS For the purposes of this Annex the following definitions apply: (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; ELI: http://data.europa.eu/eli/reg_del/2026/331/oj 3/10EN OJ L, 21.4.2026 (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/m2and 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. 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 ΔΤ ≤ 30 °C; test(1); and and Δm ≤ 50 %; and t = 0 (that is to say, no sustained f flaming). Heat of combustion test PCS ≤ 2,0 MJkg-1(1); and PCS ≤ 2,0 MJkg-1(2)(3); and PCS ≤ 1,4 MJm-2(4); and PCS ≤ 2,0 MJkg-1(5). A2 Non-combustibility ΔΤ ≤ 50 °C; test(1); and or Δm ≤ 50 %; and t ≤ 20 s. f Heat of combustion PCS ≤ 3,0 MJkg-1(1); test; and and PCS ≤ 4,0 MJm-2(2); and PCS ≤ 4,0 MJm-2(4); and PCS ≤ 3,0 MJkg-1(5). Single burning item FIGRA ≤ 120 Ws-1; Smoke production(6); 0,2MJ test). and and LFS < edge of specimen; Flaming droplets/particles(7). and THR ≤ 7,5 MJ. 600s 4/10 ELI: http://data.europa.eu/eli/reg_del/2026/331/ojEN OJ L, 21.4.2026 Class Test method(s) Classification criteria Additional classification B Single burning item FIGRA ≤ 120 Ws-1; Smoke production(6); 0,2MJ test; and and and LFS < edge of specimen; Flaming droplets/particles(7). and THR ≤ 7,5 MJ. 600s Ignitability test(8): Fs ≤ 150 mm within 60 s. Exposure = 30 s. C Single burning item FIGRA ≤ 250 Ws-1; Smoke production(6); 0,4MJ test; and and and LFS < edge of specimen; Flaming droplets/particles(7). and THR ≤ 15 MJ. 600s Ignitability test(8): Fs ≤ 150 mm within 60 s. Exposure = 30 s. D Single burning item FIGRA ≤ 750 Ws-1. Smoke production(6); 0,4MJ test; and and Flaming droplets/particles(7). Ignitability test(8): Fs ≤ 150 mm within 60 s. Exposure = 30 s. E Ignitability test(8): Fs ≤ 150 mm within 20 s. Flaming droplets/particles(9) Exposure = 15 s. F Ignitability test(8): Fs > 150 mm within 20 s. Exposure = 15 s. (1) For homogeneous products and substantial components of non-homogeneous products. (2) For any external non-substantial component of non-homogeneous products. (3) Alternatively, any external non-substantial component having a PCS ≤ 2,0 MJm-2, provided that the product satisfies the following criteria of Single burning item test: FIGRA ≤ 20 Ws-1; and LFS < edge of specimen; and THR ≤ 4,0 MJ; and 600s s1; and d0. (4) For any internal non-substantial component of non-homogeneous products. (5) For the product as a whole. (6) s1 = SMOGRA ≤ 30 m2s-2and TSP ≤ 50 m2; 600s s2 = SMOGRA ≤ 180 m2s-2and TSP ≤ 200 m2; 600s s3 = not s1 or s2. (7) d0 = no flaming droplets/particles in Single burning item test within 600 s; d1 = no flaming droplets/particles persisting longer than 10 s in Single burning item test within 600 s; d2 = not d0 or d1; Ignition of the paper in Ignitability test results in a d2 classification. (8) Under conditions of surface flame attack and, if appropriate to the intended use of the product, edge flame attack. (9) No ignition of the paper = no additional classification; Ignition of the paper = d2 classification. ELI: http://data.europa.eu/eli/reg_del/2026/331/oj 5/10EN OJ L, 21.4.2026 2. Floorings Table 2 Class Test method(s) Classification criteria Additional classification A1 Non-combustibility ΔΤ ≤ 30 °C; FL test(1); and and Δm ≤ 50 %; and t = 0 (that is to say, no sustained f flaming). Heat of combustion PCS ≤ 2,0 MJkg-1(1); test. and PCS ≤ 2,0 MJkg-1(2); and PCS ≤ 1,4 MJm-2(3); and PCS ≤ 2,0 MJkg-1(4). A2 Non-combustibility ΔΤ ≤ 50 °C; FL test(1); and or Δm ≤ 50 %; and t ≤ 20 s. f Heat of combustion PCS ≤ 3,0 MJkg-1(1); test; and and PCS ≤ 4,0 MJm-2(2); and PCS ≤ 4,0 MJm-2(3); and PCS ≤ 3,0 MJkg-1(4). Determination of the Critical flux(6)≥ 8,0 kWm-2. Smoke production(7). burning behaviour using a radiant heat source test(5). B Determination of the Critical flux(6)≥ 8,0 kWm-2. Smoke production(7). FL burning behaviour using a radiant heat source test(5); and Ignitability test(8): Fs ≤ 150 mm within 20 s. Exposure = 15 s. C Determination of the Critical flux(6)≥ 4,5 kWm-2. Smoke production(7). FL burning behaviour using a radiant heat source test(5); and Ignitability test(8): Fs ≤ 150 mm within 20 s. Exposure = 15 s. 6/10 ELI: http://data.europa.eu/eli/reg_del/2026/331/ojEN OJ L, 21.4.2026 Class Test method(s) Classification criteria Additional classification D Determination of the Critical flux(6)≥ 3,0 kWm-2. Smoke production(7). FL burning behaviour using a radiant heat source test(5); and Ignitability test(8): Fs ≤ 150 mm within 20 s. Exposure = 15 s. E Ignitability test(8): Fs ≤ 150 mm within 20 s. FL Exposure = 15 s. F Ignitability test(8): Fs > 150 mm within 20 s. FL Exposure = 15 s. (1) For homogeneous products and substantial components of non-homogeneous products. (2) For any external non-substantial component of non-homogeneous products. (3) For any internal non-substantial component of non-homogeneous products. (4) For the product as a whole. (5) Test duration = 30 minutes. (6) Critical flux is defined as the radiant flux at which the flame extinguishes or the radiant flux after a test period of 30 minutes, whichever is the lower (i.e. the flux corresponding with the furthest extent of spread of flame). (7) s1 = smoke ≤ 750 %.min; s2 = not s1. (8) Under conditions of surface flame attack and, if appropriate to the intended use of the product, edge flame attack. 3. Linear pipe insulation products Table 3 Class Test method(s) Classification criteria Additional classification A1 Non-combustibility ΔΤ ≤ 30 °C; L test(1); and and Δm ≤ 50 %; and t = 0 (that is to say, no sustained f flaming). Heat of combustion PCS ≤ 2,0 MJkg-1(1); test. and PCS ≤ 2,0 MJkg-1(2); and PCS ≤ 1,4 MJm-2(3); and PCS ≤ 2,0 MJkg-1(4). A2 Non-combustibility ΔΤ ≤ 50 °C; L test(1); and or Δm ≤ 50 %; and t ≤ 20 s. f ELI: http://data.europa.eu/eli/reg_del/2026/331/oj 7/10EN OJ L, 21.4.2026 Class Test method(s) Classification criteria Additional classification Heat of combustion PCS ≤ 3,0 MJkg-1(1); test; and and PCS ≤ 4,0 MJm-2(2); and PCS ≤ 4,0 MJm-2(3); and PCS ≤ 3,0 MJkg-1(4). Single burning item test. FIGRA ≤ 270 Ws-1; Smoke production(5); 0,2MJ and and LFS < edge of specimen; Flaming droplets/particles(6). and THR ≤ 7,5 MJ. 600s B Single burning item FIGRA ≤ 270 Ws-1; Smoke production(5); L 0,2MJ test; and and and LFS < edge of specimen; Flaming droplets/particles(6). and THR ≤ 7,5 MJ. 600s Ignitability test(7): Fs ≤ 150 mm within 60 s. Exposure = 30 s. C Single burning item FIGRA ≤ 460 Ws-1; Smoke production(5); L 0,2MJ test; and and and LFS < edge of specimen; Flaming droplets/particles(6). and THR ≤ 15 MJ. 600s Ignitability test(7): Fs ≤ 150 mm within 60 s. Exposure = 30 s. D Single burning item FIGRA ≤ 2 100 Ws-1; Smoke production(5); L 0,4MJ test; and and and THR ≤ 100 MJ. Flaming droplets/particles(6). 600s Ignitability test(7): Fs ≤ 150 mm within 60 s. Exposure = 30 s. E Ignitability test(7): Fs ≤ 150 mm within 20 s. Flaming droplets/particles(8). L Exposure = 15 s. F Ignitability test(7): Fs > 150 mm within 20 s. L Exposure = 15 s. (1) For homogeneous products and substantial components of non-homogeneous products. (2) For any external non-substantial component of non-homogeneous products. (3) For any internal non-substantial component of non-homogeneous products. (4) For the product as a whole. (5) s1 = SMOGRA ≤ 105 m2s-2and TSP ≤ 250 m2; 600s s2 = SMOGRA ≤ 580 m2s-2and TSP ≤ 1 600 m2; 600s s3 = not s1 or s2. (6) d0 = no flaming droplets/particles in Single burning item test within 600 s; d1 = no flaming droplets/particles persisting longer than 10 s in Single burning item test within 600 s; d2 = not d0 or d1; Ignition of the paper in Ignitability test results in a d2 classification. (7) Under conditions of surface flame attack and, if appropriate to the intended use of the product, edge flame attack. (8) No ignition of the paper = no additional classification; Ignition of the paper = d2 classification. 8/10 ELI: http://data.europa.eu/eli/reg_del/2026/331/ojEN OJ L, 21.4.2026 4. Electric cables Table 4 Class Test method(s) Classification criteria Additional classification A Heat of combustion PCS ≤ 2,0 MJkg-1(1). ca test. B1 Burning behaviour and FS ≤ 1,75 m; Smoke production(2)(3); ca smoke production of and and bunched cable test THR ≤ 10 MJ Flaming droplets/particles(4); 1200s (30 kW flame source); and and and Peak HRR ≤ 20 kW Acidity (pH and conductivity)(5). and FIGRA ≤ 120 Ws-1. Vertical flame spread of H ≤ 425 mm. single cable test. B2 Burning behaviour and FS ≤ 1,5 m; Smoke production(2)(6); ca smoke production of and and bunched cable test THR ≤ 15 MJ Flaming droplets/particles(4); 1200s (20,5 kW flame source); and and and Peak HRR ≤ 30 kW Acidity (pH and conductivity)(5). and FIGRA ≤ 150 Ws-1. Vertical flame spread of H ≤ 425 mm. single cable test. C Burning behaviour and FS ≤ 2,0 m; Smoke production(2)(6); ca smoke production of and and bunched cable test THR ≤ 30 MJ; Flaming droplets/particles(4); 1200s (20,5 kW flame source); and and and Peak HRR ≤ 60 kW; Acidity (pH and conductivity)(5). and FIGRA ≤ 300 Ws-1. Vertical flame spread of H ≤ 425 mm. single cable test. D Burning behaviour and THR ≤ 70 MJ; Smoke production(2)(6); ca 1200s smoke production of and and bunched cable test Peak HRR ≤ 400 kW; Flaming droplets/particles(4); (20,5 kW flame source); and and and FIGRA ≤ 1 300 Ws-1. Acidity (pH and conductivity)(5). Vertical flame spread of H ≤ 425 mm. single cable test. E Vertical flame spread of H ≤ 425 mm. ca single cable test. ELI: http://data.europa.eu/eli/reg_del/2026/331/oj 9/10EN OJ L, 21.4.2026 Class Test method(s) Classification criteria Additional classification F Vertical flame spread of H > 425 mm. ca single cable test. (1) For the product as a whole, excluding metallic materials, and for any external component (that is to say, sheath) of the product. (2) s1 = TSP ≤ 50 m2andPeak SPR ≤ 0,25 m2/s; 1200 s1a = s1 and transmittance in accordance with Smoke production of burning cable test ≥ 80 %; s1b = s1 and transmittance in accordance with Smoke production of burning cable test ≥ 60 % < 80 %; s2 = TSP ≤ 400 m2and Peak SPR ≤ 1,5 m2/s; 1200 s3 = not s1 or s2. (3) The smoke class declared for class B1 cables must originate from the Burning behaviour and smoke production of bunched ca cable test (30 kW flame source). (4) d0 = no flaming droplets/particles within 1 200 s; d1 = no flaming droplets/particles persisting longer than 10 s within 1 200 s; d2 = not d0 or d1. (5) Acidity of gases produced by burning cables test: a1 = conductivity < 2,5 μS/mm and pH > 4,3; a2 = conductivity < 10 μS/mm and pH > 4,3; a3 = not a1 or a2. (6) The smoke class declared for class B2 , C , D cables must originate from the Burning behaviour and smoke production of ca ca ca bunched cable test (20,5 kW flame source). 10/10 ELI: http://data.europa.eu/eli/reg_del/2026/331/oj