Plywood Glue adhesive : Detection of formaldehyde emission in the plywood
Formaldehyde is a kind of chemical gas. If the content of formaldehyde reaches a certain concentration in the air, it will do harm to human body. It is mainly used in the manufacturing process of composite materials and plays an adhesive role. In this way, formaldehyde contained in building materials will not evaporate immediately, but will evaporate slowly under different temperature and humidity conditions for more than ten years. Long-term residence in an environment with excessive formaldehyde concentration can cause significant damage to the human eye, nose and respiratory system or cause skin diseases. Animal experiments also showed that excessive formaldehyde release could lead to nasal and respiratory cancers.
Terms and definitions The following terms and definitions apply to this Standard.
The perforator test value was determined by the perforator test value. The formaldehyde extracted from 100 g dry wood-based panels was determined by the perforator test value.
The desiccator test value was measured by the dryer method. The formaldehyde released from the sample in the absorbent (distilled water) was measured by the dryer method.
Formaldehyde emission – the chamber test value is measured by climatic chamber method when the chamber test value releases formaldehyde to the air in a stable state.
Climate Box Volume of the Chamber Total Volume without Load.
The ratio of the total surface area of loading rate specimen to the volume of climatic chamber.
The air exchange rate is the ratio of the air volume passing through the climatic chamber to the climatic chamber volume per hour.
Air velocity near the surface of the sample in the air velocity climate box.
Classification by test method:
(a) Perforation extraction was used to detect formaldehyde emission.
(b) Formaldehyde emission was measured by dryer method (referred to as dryer value).
C) Detection of formaldehyde emission by climatic box method (climatic box value for short)