FLAMMABILITY CLASSES

Construction material classification by flammability

Incombustible construction materials

Incombustible construction materials – class A
E.g. stone, shale, sandstone, granite, concrete, bricks, tiles, ceramic tiling, mortars, cement renderings, hard plasters, Perlit, construction metals (steel, aluminum), glass, molten basalt, Porfix, Dupronit A, Dupronit B, Ezalit B, Ezalit C, mineral-fiber panels (Kolvit), basaltic felt, B-type mineral fiber, glass-fiber panels (Araver), pressed and non-pressed Cembalit, Cemavin, pressed and non-pressed lignate panels, Unicel, Dexamin-type poured polyester floor covering, special parget materials and fire-stopping paintings.

Combustible construction materials and underlays

There are four classes of construction materials and combustible underlying materials:

class B materials – heavy fuels
class C1 materials – hardly inflammable
class C2 materials – medium inflammable
class C3 materials – flash fuels

Class B materials – heavy fuels
E.g. Akumin, Izomin, Heraklit, Lignos, Rajolit, Velox, non-softened PVC (Novodur, Durofol B), sturdy PVC (Duroplast H, Dekorplast), polyester retarded fiberglass (retardant Dexamin into material or gel-coating layer), mineral-fiber panels (basaltic felt), Rotizol, fiberglass panels (Itaver), glass knotty mat, glass sewn mat, plaster panels.

Class C1 materials – hardly inflammable
E.g. hardwoods (oak, beech), Hobrex panels, Sirkolit, Werzalit, Bromkalem-retarded polystyrene, hardened paper (Formica, Ecrona), organic-fiber felt haired panels, foil floor covering PVC Sloviplast VP-1 P, Regina, poured polyester laminate floor covering (Fortit), common-use waterproof plywood, construction waterproof plywood.

Class C2 materials – medium inflammable
E.g. softwoods (spruce, fir, pine, larch), common-use chip boards, Piloplat, wood-fiber boards Duplex, Solodur, SP-type cork boards, cork parquet, scutch boards (Orlen), Izolit foil floor covering, Industriál rubber floor covering, Super floor covering, Raltex floor fabric, Kasak special, Krylan, Final, Tumir ex, pasteboard with Bitalbit animal binder.

Class C3 materials – flash fuels
Laminate chip boards, particle boards, Pilolamit, wood-fiber boards Akulit, Bukolit, Bukolamit, Hobra, Sololak, Sololit, BA-type cork boards, linear polyethylene, expanded polyethylene, organic glass (Akrylon, Umaplex), Polypropylén, Polystyrén (sturdy, expanded, standard). Polyurethane – expanded, softened (Molitan), rigid, standard, expanded PVC (Technopor), rubber isolation foil, standard glass polyester laminate, Sip and Intersip needled isolation fabric, designed rubber floor covering, rubber isolation carpet for electronics, synthetic nap textured floor fabric (Bergamo), sewn-in (Kovral, Porto, Kasalin, Kurgan, Rekos, Palas, Taklon, Tanur, Tamir, Velen, Velvex, Syntetik needled fabric, Jekor standard, Riga extra), pasteboards and animal binder materials, S-type tar band with pasteboard insert, IPA, Esterbit S.

Flammability classification of construction materials herein stated is in compliance with ČSN 73 0823 (1983) "Flammability class of construction materials". Flammability tests are performed using test method in compliance with ČSN 73 0862 "Setting flammability class of construction materials" (1980). The tests were performed in the Research Institute of Structural Engineering in Prague at detached workplace in Veselí nad Lužnicí.

See ČSN 73 0823 for more information about herein stated materials and products, namely technical standard or technical conditions labeling.

Particular construction materials were evaluated and classified so far in compliance with ČSN 73 0862 "Setting flammability class of construction materials". This standard has been valid through 31.12.2003, however to be able to continually evaluate materials, this standard is still used within project standards, as well as the ČSN 73 0823 value standard, till 31st December 2007. This standard provides above stated classification.

Starting from 1st July 2003, new way of flammability classification is valid in the Czech republic called "Fire reaction" that is defined in ČSN EN 13501-1 classification standard.

ČSN 33 2312, addition Z1 provides a conversion method from flammability classes requirements to fire reaction classes for construction products except for floor covering.

Flammability class (according to formerly used ČSN 73 0862)	Fire reaction class (according to ČSN EN 13501-1)
A	A1
B	A2
C1	B
C2	C or D
C3	E or F

I.e. if ČSN 73 0802 says that it is allowed to use at least C1 flammability class material, then this table shows us corresponding fire reaction classes A1, A2, B.

The converter is a part of national appendix to ČSN EN 13501-1.

Before re-certification the KOPOS products are tested in compliance with ČSN 73 0823.

FLAMMABILITY CLASSES

Construction material classification by flammability

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