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- Emission test chamber (2) (entfernen)
The labelling of construction products or building materials as “low-emitting” is based on measurements using third-party emission test chambers. Unfortunately there is no method to validate the performance of such test chamber measurements. This might give a Variation of results when testing one material at different laboratories. Therefore it is necessary to hold round robin tests as part of the quality management System to ensure comparable results.
A research project financed by the Federal Environmental Agency focused on the development of an external quality management System for the detection of relevant Chemical compounds from products and in ambient air. The project was structured in four phases (Horn et al., 2009 and 2011; Wilke et al., 2009a) This paper shows results of the fourth phase of the project, which was an inter-laboratory study for VOC-emission testing by means of emission test chambers.
Emissions from building products can considerably impair the quality of indoor air. The AgBB scheme is employed to evaluate the emissions of volatile organic compounds (VOC) from building products. The hygienic evaluation according to the AgBB scheme requires product-specific measuring procedures.
These are available for a range of products. They have been validated in co-operation with several research and testing institutes and have been included in the criteria for awarding the Blue Angel ecolabel.
The evaluation is, however, stricter and generally has lower limits. VOC emissions and odours can cause health problems so testing using sensors is an important element in the evaluation of building products and has – for reasons of precaution – been set down in the AgBB scheme. The main goal of the project was to derive a method of evaluation using sensors and limits for awarding the Blue Angel and for the AgBB scheme. Based on the research conducted (see Chapter 5 Results and Discussion), perceived intensity and hedonics were suggested as a suitable Evaluation method. The derivation of limits for the evaluation using sensors on the 28th day was effected in the present study through the additional questioning of the test subjects on the reasonability of a sample.
For the Blue Angel, there could be different limits of perceived intensity and hedonics for each group of products. A preliminary suggestion for possible limits – for all product groups – is a perceived intensity of 7 pi (5 pi + 2 pi as confidence coefficient, Chapter 5.1.5) and -1 (0+/-0.8, rounded to -1) for the hedonic value.