Plywood Glue adhesive : Standards for determining formaldehyde emission from wood-based panels in China, USA, Europe, and Japan
Scope and standard of formaldehyde detection method
After the new house is decorated, how can we know whether the indoor formaldehyde exceeds the standard? We can determine it by some methods of measuring formaldehyde. In order to avoid formaldehyde exceeding the standard, we can minimize formaldehyde by green decoration and choosing environmentally friendly materials.
At present, there are three main methods for formaldehyde detection in furniture industry national or industry standards: dryer method, perforation extraction method, climatic box method, and three methods for different products and applications. Furniture formaldehyde emission detection standards and methods include: GB18584* wood furniture harmful substances limit; GB18580* wood-based panels and their products formaldehyde emission; QB/T1952.1 software furniture mattress standard formaldehyde emission detection.
Formaldehyde testing institutions should choose formal institutions with testing qualifications. The state stipulates that the testing institutions should be able to produce testing reports with CMA marks, and the inspectors must have professional certificates.
In the plywood and wooden-based panels such as plywood ,PB ,MDF ,OSB ,or other types of composited boards ,There are three testing methods described in the US standard for the formaldehyde emission: large chamber, small chamber, and desiccator. The US standards do not classify formaldehyde emission limitation levels. The US standard gives a limit value of formaldehyde emission by the chamber method.
Japanese standards state the limit values by the desiccator method with 4 levels of formaldehyde limit, including the average and the maximum value. F★★★★ is the most stringent level of formaldehyde emission with the average value of less than 0.3 mg/L. The so-called zero formaldehyde emission is defined as ≤0.3 mg/L, because the formaldehyde emission from the natural wood is generally 0.1~0.3 mg/L tested by desiccator method.
Chinese and EU standards have more similarities:
(1) the limited classification: both Chinese standards and EU standards have the E-level classification of formaldehyde emissions, such as E0, E1, and E2. In EU standards, there is no E0 level.
(2) The test methods: the Chinese mandatory standard uses desiccator, perforation, and chamber method. The gas analysis method is only used in the recommended product standard. The EU standard uses perforation, gas analysis, and chamber methods.
(3) The limited value: the E1 limit value of perforation method in Chinese mandatory standard is higher than that of EU.
The implementation of these standards provides the basis for effective control of formaldehyde pollution. But there are also shortcomings, the differences of the limited value and the test methods between the standards cause the difference of judgment results.