Home>ISO Standards>ISO 16929:2013 pdf free

ISO 16929:2013 pdf free

ISO 16929:2013 pdf free.Plastics一Determination of the degree of disintegration of plastic materials under defined composting conditions in a pilot-scale test
Sieve each of the samples through a standard 10 mm sieve, searching the overflow carefully for large lumps of (sticky) compost in which pieces of test material remain and breaking these up to crumbly particles, which have a more typical particle size distribution for compost and are easier to sieve. Separate the sieved material further by sieving through a standard 2 mm sieve. From the 2 mm to 10 mm fraction thus obtained, pick out all particles of the test material, place them on a separate 2 mm sieve and clean carefully, if possible by washing under a running tap. Dry the cleaned particles at 105 °C (or at 40 °C for test materials with melting temperatures below 105 °C) untill constant mass is reached. From the mass of total dry solids thus obtained, calculate the degree of disintegration as indicated in Clause 7. In addition, measure the amount of organic matter present by determining the volatile-matter content.
NOTE Picking out the particles of test material can be facilitated by dividing the 2 mm to 10 mm fraction into fractions with a narrower particle-size distribution (e.g. 2 mm to 5 mm and 5 mm to 10 mm). Losses of particles of test material during the cleaning process can be avoided by using an additional 1 mm sieve under the 2 mm sieve. All particles <2 mm in size are, however, usually neglected.
It is recommended that samples be taken from the compost left after picking out the test material for compost quality analyses and ecotoxicity tests.
Carry out a visual assessment at least at the beginning and the end of the test and, if possible, whenever the test material is turned. Estimate the particle size distribution of the test material and record signs of microbial colonization (e.g. fungal hyphae, bacterial growth) on the test material particles.
For this, select at least 10 particles providing an impression of all visible degradation phenomena, ranging from little decomposition to extensive degradation of the test material. Clean the selected particles carefully with water and evaluate visually with regard to the following:
– consistency and compactness of the material;
– decolourization;
– signs of local disintegration (e.g. the presence of holes);
– how easy (or difficult) it was to pick out the test material.
Return the selected particles to the composting mixture. Note and document the results of each assessment in writing and by means of photographs.
A visual assessment is strongly recommended if the test material does not disintegrate completely after 12 weeks. ISO 16929 pdf download.


Related standards