BS EN 14836:2018 pdf download

BS EN 14836:2018 pdf download.Surfaces for sports areas – Synthetic surfaces for outdoor sports areas – Test method for artificial weathering
3 Principle
Specimens are exposed to ultraviolet (UV) radiation under controlled environmental conditions. Two exposure periods are specified. Method 1 is for assessing products intended for installation in environments where high levels of UV exposure are unlikely. Method 2 is for assessing products intended for installation in environments where high levels of UV exposure might be expected. NOTE 1 Guidance on the direct long-term average solar irradiation levels that any specific region may be expected to experience is available from numerous sources including: www.solargis.com. Typically northern Europe will receive between 400 kWh/ m2 and 1500 kWh/m2 per year and southern Europe will receive between 1200 kWh/m2 and 2000 kWh/m2 per year. NOTE 2 Fluorescent UV lamps use the emission from a low-pressure mercury arc to excite a phosphor that produces a continuous spectrum in a relatively narrow wavelength interval, which is generally distributed around a peak wavelength. The spectral distribution of the radiation from a fluorescent lamp is determined by the emission spectrum of the phosphor and the UV transmission properties of the glass tube. Fluorescent UV lamps are generally used to expose material to UV radiation in a limited spectral range. The use of alternative artificial weathering procedures, such as those specified in EN ISO 4892-2, might be used when developing products.
4 Apparatus
Artificial weathering cabinet using fluorescent UV lamps and environmental controls having the following features: a] UVA-340 nm lamps (Type 1A) in accordance with EN ISO 4892-3, with a spectrum in accordance with EN ISO 4892-3 and capable of uniformly applying radiation to the test specimen at an irradiance of 0,80 W/m2/ nm at 340 nm. Exposure chamber, constructed from inert material and that provides uniform irradiance in accordance with item  and that includes a means of controlling and measuring the relevant parameters. Condensation wetting mechanism, to wet the exposed face of the specimen, in accordance with EN ISO 4892-3:2016, 4.5.2. The water vapour shall be generated by heating water in a container located beneath and extending across the whole area occupied by the test pieces. Test specimen holders [completely filled with specimens or blanking panels) shall constitute the sidewall of the exposure chamber, so that the backs of the holders are exposed to the cooling effect of the ambient room temperature. Calibrated radiometer, conforming to EN ISO 4892-1, placed alongside the test specimens with the measuring sensor aligned to the same orientation as the test specimens so that it monitors the irradiance and radiant exposure experienced by the test specimens. If test specimens are mounted on the walls of the test chamber and also placed on the base of the chamber two radiometers shall be used.