BS ISO 23832:2021 pdf download

BS ISO 23832:2021 pdf download.Plastics — Test methods for determination of degradation rate and disintegration degree of plastic materials exposed to marine environmental matrices under laboratory conditions
1 Scope
This document specifies test methods for the measurement of the physical degradation of samples made with plastics materials when exposed to marine environmental matrices under aerobic conditions at laboratory scale. This document is not suitable for the assessment of degradation caused by heat (thermo-degradation) or light exposure (photo-degradation).
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.
ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles
ISO 527-2, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and extrusion plastics
ISO 527-3, Plastics — Determination of tensile properties — Part 3: Test conditions for films and sheets
ISO 4593, Plastics — Film and sheeting — Determination of thickness by mechanical scanning
ISO 16012, Plastics — Determination of linear dimensions of test specimens
ASTM D 638-14, Standard Test Method for Tensile Properties of Plastics
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1 biodegradation
degradation caused by biological activity, especially by enzymatic action, leading to a significant change in the chemical structure of a material
[SOURCE: ISO 472:2013, 2.1680]
3.2 degradation
irreversible process leading to a significant change in the structure of a material, typically characterized by a change of properties (e.g. integrity, molecular mass or structure, mechanical strength) and/or by fragmentation, affected by environmental conditions, proceeding over a period of time and comprising one or more steps
[SOURCE: ISO 472:2013, 2.262]
3.3 disintegration
physical breakdown of a material into very small fragments
[SOURCE: ISO 14855-1:2012, 3.3]
3.4 total dry solids
amount of solids obtained by taking a known volume of test material or inoculum and drying at about 105 °C to constant mass
[SOURCE: ISO 13975:2019, 3.5]
4 Principle
This document describes three laboratory test methods: a) Method A: Sand burial degradation test; b) Method B: Sediment/seawater interface degradation test; and c) Method C: Seawater degradation test. These three test methods are based on the exposure of plastic samples to environmental matrices taken from the sea and on the measurement of physical degradation. These three test methods differ for the exposure conditions. In Method A, the plastic samples are buried in a wet sandy sediment (a condition similar to the sandy shoreline where beach is maintained wet by the waves and tides). In Method B, the plastic samples are laid at the interface between a sandy sediment bed and a water column (a condition similar to the seabed where most debris sinks, accumulates, and undergoes degradation).