Stable Performance of Formaldehyde Test Specimen Pretreatment Chamber for Multi compartment VOC Constant Temperature and Humidity Pretreatment Chamber

The material list is as follows:
1. Equipment appearance: The dark gray coating should be flat and smooth, with uniform color and small gaps between edges. There should be no defects such as exposure, delamination, blistering, spots, deep scratches, etc;
2. Test chamber inner wall: The material is 304 mirror stainless steel welded as a whole, with a thickness of no less than 2mm. The inner wall should have a flat and smooth appearance, uniform color, and no bubbles or scratches. All edges and corners should be made into rounded corners, which can be washed and cleaned with water. The overlap between the inner wall plates can be seamless and full welded, and the welding and surrounding areas should be polished without deformation. Sealing materials and other devices in contact with the air in the test chamber should not produce Does not adsorb volatile organic compounds (V0C) and formaldehyde, has no interference with detection, and meets the background requirements in the test chamber
3. The climate box adopts a jacket method to control the environmental temperature of the test chamber, and there are no condensation pipes, humidifiers, or condensate storage tanks inside the test chamber; The refrigeration and heating components, as well as the circulating impeller components, are installed in the circulating air duct; In order to reduce the impact of the jacket air layer on the air in the test chamber, it is required that the test chamber and external insulation chamber share a common door;

For indoor air testing, China has two sets of standards: "Indoor Air Quality Standard" (GB/T18883-2002) and "Indoor Environmental Pollution Control Scope for Civil Building Engineering" (GB50325-2020) (2013 version). It should be emphasized that in the national standard, formaldehyde content below 0.1mg/m3 can only meet the basic living requirements of adults and healthy individuals; The living environment for pregnant women, newborns, and young children should have a formaldehyde concentration below 0.05mg/m3; Residents who suffer from allergies or respiratory diseases have a concentration of less than 0.03mg/m3; Developed countries in Europe and America are committed to reducing the national standard to 0.02mg/m3! Formaldehyde, colorless and irritating, has a certain threshold for its odor, ranging from 0.05 to 1.0 PPM. People with high sensitivity can smell it at 0.05 PPM; But most people only smell it at 1.0PPM, and by this time, formaldehyde has exceeded the limit by 10 times! So judging the concentration of indoor formaldehyde through smell is definitely unreliable!

Principle of formaldehyde VOC pretreatment warehouse pretreatment:
Place the materials and products or their samples in the pretreatment room, adjust the temperature, relative humidity, wind speed, pressure, indoor voc cleaning conditions and other environmental conditions in the room, so that the temperature and humidity of the samples in the balance room are consistent, and the release amount and release rate of the samples are balanced. At the same time, it is necessary to avoid cross contamination of the sample (cross contamination of TVOC release, cross contamination of single component VOC).
Applicable to GB18580-2017 "Indoor Decoration and Decoration Materials - Formaldehyde Emission Limits in Artificial Panels and Their Products"
GB17657-2013 "Experimental Methods for Physical and Chemical Properties of Artificial Panels and Decorative Artificial Panels"
EN 717-1 "Measurement of formaldehyde emissions from wood-based panels - Environmental chamber method"
ASTM D6007-02 "Standard Test Method for Determining Formaldehyde Concentration in Gases Released from Wood Products in Small Scale Environmental Boxes" and other standards