BS EN ISO 20200:2005 pdf free

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BS EN ISO 20200:2005 pdf free.Plastics Determination of the degree of disintegration of plastic materials under simulated composting conditions in a laboratory—scale test.
BS EN ISO 20200 This International Standard specifies a method of determining the degree of disintegration of plastic materials when exposed to a laboratory-scale composting environment. The method is not applicable to the determination of the biodegradability of plastic materials under composting conditions. Further testing is necessary to be able to claim compostability.The following referenced documents are indispensable for the application 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. The method determines the degree of disintegration of test materials on a laboratory scale under conditions simulating an intensive aerobic composting process. The solid matrix used consists of a synthetic solid waste inoculated with mature compost taken from a commercial composting plant. Pieces of the plastic test material are composted with this prepared solid matrix. The degree of disintegration is determined after a composting cycle, by sieving the final matrix through a 2 mm sieve in order to recover the non-disintegrated residues. The reduction in mass of the test sample is considered as disintegrated material and used to calculate the degree of disintegration. 5 Synthetic solid waste The composition of the synthetic waste used in this method is described in Table 1. Well aerated compost from a commercial aerobic composting plant shall be used as the inoculum. The compost inoculum shall be homogeneous and free from large inert objects such as glass, stones or pieces of metal. Remove any such objects manually and then sieve the compost on a screen of mesh aperture between 0,5cm and 1 cm. It is recommended that compost from a plant composting the organic fraction of solid municipal waste be used in order to ensure sufficient diversity of microorganisms. If such a compost is not available, then compost from plants treating farmyard waste or mixtures of garden waste and solid municipal waste may be used. The compost shall not be older than 4 months. Prepare the synthetic waste manually by mixing the different components listed in Table 1. The allowed tolerance on the mass measurements of the synthetic waste components, water included, is 5 %. Add chlorine-free tap water, or de-ionized or distilled water, to the mixture to adjust its final water content to 55 % in total. Perform this operation just before start-up. The synthetic waste shall have a carbon:nitrogen (C/N) ratio of between 20:1 and 40:1. The urea concentration can be changed to adjust the C/N ratio to the required range. In this case, the concentration of the other components shall be adjusted proportionately in order to bring the total dry mass of the solid waste to 100 %. BS EN ISO 20200 pdf download.

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