ISO 16000-23:2018 pdf free.Indoor air – Performance test for eva luating the reduction of formal dehyde and other carbonyl compounds concentrations by sorptive building materials.
The performance of a building material in reducing the concentration of target compound(s), i.e. formaldehyde and other carbonyl compounds, from the indoor air is evaluated by monitoring the reduction of the concentration of these substances in the air of a test chamber containing a specimen of the test material. The test assesses both the initial performance of the material and how long that performance is maintained.
In this test method, target compound spiked air is supplied into the test chamber. The spiked air should be prepared at approximately the guideline concentration level for the target compound(s) in indoor air. Reference to the WHO or an appropriate national standards body can be made if this is clearly highlighted in the test report.
Performance is determined by monitoring the difference in the concentration of target compound(s) at the inlet and outlet of the test chamber. Testing should be carried out for the half-lifetime, i.e. until the concentration reduction performance of target compound(s) drops to one half of the performance recorded at the start of the test under constant ventilation conditions. With this test, the area-specific reduction rate, Pads, and total mass per area of sorption, PAc’ at the half-lifetime are determined. The value measured for PAC at the half-lifetime is defined as the saturation mass per area, PAa.
If a test material continues to reduce target compound concentrations for longer than 28 days, the alternative methods specified in Annex A for determining PAa may be applied.
The performance of sorptive building materials is mainly determined by the target compound concentration, the mass transfer coefficient of target compound(s) to the surface, and the sorption characteristics of the building materials themselves (adsorption isotherm, diffusion resistance, and so on). Therefore, the performance test method shall specify both the concentration of target compound(s) and the mass transfer coefficient associated with the sorptive building material.
A re-emission test should be conducted following the test for evaluating the concentration reduction performance, as described in 11.3.1.
NOTE The long-term formaldehyde target compound reduction performance is represented by the saturation mass per area, PAa. and, if necessary, the lifetime of the pollutant-removing performance, tit, as the subsidiary index.Use the inlet and outlet air of the test chamber for sampling. When a separate sampling port is used, sample directly from the inlet or outlet of the chamber.
If a duct or tube is used, it shall be as short as possible and kept at the same air temperature as that of the test chamber. Such a duct or tube shall be made of a material with a very low sorption capacity, e.g. polytetrafluoroethylene.
The sum of sampling air flow rates shall be smaller than the air flow rate into the chamber. Sampling devices shall comply with the specifications of ISO 16000-3. When the air is sampled from the inlet, ensure the supply air flow rate remains constant.
A multiport sampling manifold may be used to provide flexibility for duplicate air sampling. A mixing chamber between the test chamber and the manifold or between the air inlet and the test chamber can be included to permit addition and mixing of internal standard gases with the test chamber air stream.
The exhaust from the test chamber should be ducted into a fume hood, ensuring that target compound spiked air and any chemicals emitted from the test material are isolated from the laboratory environment.ISO 16000-23 pdf download.