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CCTV News: Recently, the Shanghai Municipal Bureau of Quality and Technical Supervision entrusted the Shanghai Academy of Quality Supervision, Inspection and Technology to carry out a quality and safety risk monitoring of local production and sales of geothermal floor products that are rated for geothermal applications. The object to be monitored is a dedicated geothermal floor and an impregnated paper laminated wood floor. Of the 24 batches of composite floors sampled for the risk monitoring of the geothermal floor, two types of flooring each accounted for 12 batches. The core content of monitoring is reference to the national standards such as "Test methods for physical and chemical properties of man-made boards and decorative panels" and "Standard for formaldehyde release in interior decorative materials and artificial boards and their products", and the formaldehyde emission of geothermal floors at different temperatures. Conduct risk monitoring.
It is understood that the relevant national standards only stipulate the floor formaldehyde emission limit under the temperature of 23°C, while the environmental temperature of the contact surface of the floor and geothermal pipes used in the geothermal environment is about 35°C. The geothermal outlet temperature is generally It is about 50 degreeC. Therefore, this time the risk monitoring included 35°C and 50°C ambient temperature in the monitoring range.
The experimenter measured the formaldehyde emission of 24 samples at different temperatures and found that they were fully qualified at the standard 23 degree Celsius release of formaldehyde.
However, with the increase of temperature, these floor samples with formaldehyde emission at room temperature complying with the reference values ​​specified by the national standard have different levels of formaldehyde emission.
At 35 °C, the formaldehyde emission of five batches of samples exceeds the standard reference value of ≤0.12 mg/m2. At 50 °C, there are 19 batches of formaldehyde emission exceeding the reference value.
The experimenter also found that at 35°C, the five batches of formaldehyde emission exceeding the reference value were all impregnated paper laminated wood floors. At 50 °C, impregnated paper laminated wood flooring had 12 batches of formaldehyde emission exceeded, the overrun rate was 100%, and 7 batches of solid wood flooring were exceeded, and the overrun rate was 58.3%. This shows that there is a risk of quality and safety in geothermal floor products, especially impregnated paper laminated wood flooring.
Experts pointed out: From the data of risk monitoring, simply considering the amount of formaldehyde released, solid wood flooring must be better than impregnated paper laminated wood flooring. However, the wear-resistant layer of the impregnated paper laminated wooden floor surface is better than the wear-resistant paint on the surface of the solid wood composite floor. Therefore, consumers should choose according to their own actual needs and wishes according to their actual use conditions.
At present, China does not have a specific standard for geothermal floors. The GB 18580-2001 national standard for risk monitoring reference only specifies the formaldehyde emission from the floor at 23°C, but there is currently no reference to the formaldehyde release limit of geothermal floor in high temperature environment. Scientific value. The formaldehyde release value of this type of geothermal floor product meets the standard limit value, but there is no standard to refer to the strange phenomenon when the limit value exceeds the limit value at high temperature, which makes the determination of the quality of formaldehyde emission of geothermal floor products on the market undisciplined. Objectively caused the current status of this type of product is uneven.
In this regard, experts from relevant industry associations pointed out that to control the problem of formaldehyde emission from geothermal floors, it is only necessary to gradually raise the standard and ensure that the formaldehyde released from floors at forty to fifty degrees Celsius should also be qualified. In the current situation, the detection method from the detection of the finished product to the detection of formaldehyde emission from the raw material substrate may be an effective measure to reduce the consumers' exposure to formaldehyde emission from the geothermal floor.
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