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VOC Emissions what you get and what you calculate Reinhard Oppl Director VOC Testing

VOC Emissions what you get and what you calculate Reinhard Oppl Director VOC Testing Eurofins Product Testing A/S Galten / Denmark Folsom / California Shenzhen / China. Test chambers. Photo: Eurofins Product Testing A/S. Significance of test result.

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VOC Emissions what you get and what you calculate Reinhard Oppl Director VOC Testing

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  1. VOC Emissions what you get and what you calculate Reinhard OpplDirector VOC Testing Eurofins Product Testing A/S Galten / Denmark Folsom / California Shenzhen / China

  2. Test chambers Photo: Eurofins Product Testing A/S

  3. Significance of test result • What you get from chamber testing is:Test chamber air concentration at given time mg/m³,then we calculate from that: • Emission rate per hour, mg/h • Specific emission rate (emission factor), • per area mg/m²h • or per mass, per device, per unit • Contribution to air concentration, mg/m³ (source strength) in reference room or in real room after a specified time • Compare with limit values (always given as air concentration)

  4. European Reference Room • Reference room - not a test room, but just a model • Needed for comparing test result with air concentration limit values • European Reference Room (CEN TC 351): • Floor area 12 m², Height 2.5 m, Volume 30 m³ • 1 window, 1 door • Then calculate loading factors (m²/m³) for walls etc., • ½ air change per hour • Area specific air flow rate (m³/m²h)= ach / loading factor • 23 °C, 50% relative humidity • As most products can be used in various exposure scenarios, this room is used as general reference for all situations • Testing shall simulate those rooms in small scale • Test chambers made of stainless steel or glass, 50 litres to several m³

  5. Different Exposure Scenarios • US: Open-plan or private office, class room, residential • Different in surface, room height, furniture, equipment, ventilation • Why different exposure scenarios can make sense: • Some products are manufactured only to e.g. offices, schools, etc. and then are rated against specific conditions • Ambition is to predict air concentrations in such rooms • Why different exposure scenarios cannot make sense: • Almost all products are used in all scenarios • A product may pass one, but fail another scenario • (How) Will product marketing distinguish? • We need an unambiguous scale for rating products • Select one small room as worst-case scenario • Do not exaggerate precision in exposure scenarios; • e.g. round 1.89 m² to 2 m² (door in CA); 31.4 m² to 30 m² (walls in EU) • Emissions can vary over time ± 30-50%; testing uncertainty ± 30-50%

  6. VOC long-term emissions – schedule • All programs evaluate in-use phase emissions • Evaluation mostly after 28 days in Europe, after 14 days in USA • Limits after 3 days cover renovation / refurbishing • Testing in ventilated test chambers; no correlation with VOC content Emissions Example of a decay curve Lifetime All emissions during lifetime = VOC content

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