BS EN 1568-2:2018 pdf download

BS EN 1568-2:2018 pdf download.Fire extinguishing media – Foam concentrates
1 Scope
This European Standard specifies requirements for chemical and physical properties, and minimum performance requirements of high expansion foams suitable for surface application to water- immiscible liquids. Requirements are also given for marking. WARNING – Any type approval according to this standard is invalidated by any change in composition of the approved product. Some concentrates conforming to this part of EN 1568 can also conform to other parts and therefore can also be suitable for application as low and/or medium expansion foams.
2，Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1568-1, Fire extinguishing media – Foam concentrates – Part 1: Specification for medium expansion foam concentrates for surface application to water-immiscible liquids
EN 1568-3, Fire extinguishing media – Foam concentrates – Part 3: Specification for low expansion foam concentrates for surface application to water-immiscible liquids
EN 1568-4, Fire extinguishing media – Foam concentrates – Part 4: Specification for low expansion foam concentrates for surface application to water-miscible liquids EN ISO 3104, Petroleum products . Transparent and opaque liquids – Determination of kinematic viscosity and calculation of dynamic viscosity (ISO 3104) EN ISO 3219:1994, Plastics . Polymers/resins in the liquid state or as emulsions or dispersions – Determination of viscosity using a rotational viscometer with defined shear rate (ISO 3219:1993)
6 Viscosity of the foam concentrate
6.1 Newtonian foam concentrates
The viscosity of the foam concentrate at the lowest temperature for use claimed by the manufacturer shall be determined in accordance with EN ISO 3104. If the viscosity is > 200 mm2S. 1, the container shall be marked in accordance with Clause 14 .
6.2 Pseudo-plastic foam concentrates
The viscosity of the foam concentrate shall be determined in accordance with Annex D. If the viscosity at the lowest temperature for use is greater than or equal to 120 mPa.s at 375 S-1, the container shall be marked in accordance with Clause 14 k).
7，pH of the foam concentrate
The pH of the foam concentrate sampled in accordance with Annex B shall be not less than 6,0 and not more than9,5at (20+1)°C.
8 Surface tension of the foam solution
The surface tension (determined in accordance with F.2) of the foam solutions prepared using top and bottom half-samples (see E.4) of the foam concentrate, sampled in accordance with Annex B and conditioned in accordance with Annex E, shall be not less than 0,95 times and not more than 1,05 times the surface tension of the foam solution prepared using the sampled foam concentrate.