This standard specifies a method for the determination of the heat of combustion of building products at constant volume in a bomb calorimeter.
This standard describes a test method for the measurement of the gross heat of combustion (PCS). Annex A describes the calculation of the net heat of combustion (PCI) when required.
Information on the precision of the test method is given in Annex B.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this standard.
ISO 13943 "Fire Safety-Vocabulary"
EN 13238 "Reaction to Fire Tests for Budding Products-Conditioning Procedures and General Rules for Selection of Substrates"
3 Terms and Definitions
For the purposes of this standard, the terms and definitions given in ISO 13943, together with the following terms and definitions, apply.
3.1
Product
Material, element or component about which information is required.
3.2
Material
Single basic substance or uniformly dispersed mixture of substances e.g. metal, stone, timber, concrete, mineral wool with uniformly dispersed binder, polymers.
3.3
Homogeneous product
Product consisting of a single material having uniform density and composition throughout the product.
3.4
Non-homogeneous product
Product that does not satisfy the requirements of a homogeneous product and which is composed of more than one component, substantial and/or non-substantial.
3.5
Substantial component
Material that constitutes a significant part of a non-homogeneous product, a layer of which having a mass/unit area ≥1.0kg/m2 or a thickness ≥1.0mm.
3.6
Non-substantial component
Material that does not constitute a significant part of a non-homogeneous product. A layer with a mass/unit area <1.0 kg/m2 and a thickness <1.0mm is considered to be a non-substantial component.
Two or more non-substantial layers that are adjacent to each other (i.e. with no substantial component(s) in between the layers) are regarded as one non-substantial component when they collectively comply with the requirements for a layer being a non-substantial component.
3.7
Internal non-substantial component
Non-substantial component that is covered on both sides by at least one substantial component.
3.8
External non-substantial component
Non-substantial component that is not covered on one side by a substantial component.
3.9
Heat of combustion
Thermal energy produced by combustion of unit mass of a given substance, expressed in joules per kilogram.
3.10
Gross heat of combustion, PCS
Heat of combustion of a substance when the combustion is complete and any produced water (including water vapour generated by moisture in the material and water vapour generated during hydrogen combustion in material composition) is entirely condensed under specified conditions, in MJ/kg.
3.11
Net heat of combustion, PCI
Heat of combustion of a substance when the combustion is complete and any produced water (including water vapour generated by moisture in the material and water vapour generated during hydrogen combustion in material composition) is in the vapour state under specified conditions, which is numerically equal to the difference of the gross heat of combustion minus latent heat of vaporisation of water released when the water vapour generated after material combustion is condensed in bomb, in MJ/kg.
3.12
Latent heat of vaporisation of water
Heat which is required to change water from a liquid to a gas, MJ/kg.
