Hot water bubble floor to measure formaldehyde? Justified but not reliable
The "poisonous floor" incident broke out on the Internet, and Vanke Real Estate announced that it will thoroughly investigate all the properties that use Anxin Floor. Although Vanke and more than 40 cities across the country issued a total of 163 re-examination reports on Anxin Floor, except for the formaldehyde floor of Vanke Foshan, the test results were in line with national standards.
The quality of the floor in the market is uneven. How to buy a safe and reliable floor, and let the consumers take pains. The simple method of measuring formaldehyde is also available on the Internet: “take a small sample and soak in boiling water after going home. 3 to 5 minutes, smell a smell of irritating. Good floor due to low formaldehyde emission, generally do not smell pungent odor. Once you smell more exciting, even the eyes feel uncomfortable, basically It is determined that the formaldehyde in the floor exceeds the standard."
Is this method of measuring formaldehyde reliable? Gan Chao, an expert in the Chemical Building Materials Center of Jiangsu Provincial Quality Inspection Institute, said that there is a certain basis, but the test results are not reliable. "Formaldehyde is soluble in water, and its aqueous solution is formalin." Gan Chao explained that formalin will emit a pungent odor, and the floor of formaldehyde exceeding the standard will have a pungent odor. However, this test method is very rough, and the pungent odor does not necessarily mean that the formaldehyde in the floor exceeds the standard. It is possible that the formaldehyde emission of the floor is below the critical value and is still qualified.
The national standard test for formaldehyde must be carried out under specified conditions, and the requirements for procedures, tools, environmental conditions and inspectors are severe. Like the formaldehyde test, there are extraction methods and dryer methods. It is unlikely that the citizens will meet these conditions when they self-test. It is difficult to use the online legendary detection method.
Where does the “toxic†floor formaldehyde come from? Using glue to cause formaldehyde to exceed the standard
There are 4 kinds of common floors: solid wood flooring, solid wood composite flooring, laminate flooring and bamboo flooring. Recently, the “poisonous†floor that has received much attention mainly refers to laminate flooring with excessive formaldehyde emission.
Gan Chao introduced that the laminate flooring is generally composed of four layers of structure, the surface of the floor is wear-resistant layer, mainly composed of aluminum oxide, which has strong wear resistance and hardness. This is followed by a decorative layer, a layer of paper impregnated with melamine resin. There is also a base layer, the main structure is medium and high density fiberboard, treated by high temperature, high pressure and gluing. Finally, the balance layer, which is a layer of kraft paper, has a certain strength and thickness, and is impregnated with resin to prevent moisture and floor deformation. The solid wood composite board is made of plywood and the veneers are bonded together.
The laminate flooring and the solid wood composite floor are bonded by the adhesive, which will produce formaldehyde, less adhesive, and poor drainage performance of the floor; the more formaldehyde, the higher the adhesion fastness, and the formaldehyde in the floor itself is inevitable. Gan Chao said, “Using urea-formaldehyde glue and phenolic glue, the phenolic rubber formaldehyde content is low, but the price is high.†The quality of the glue used by the production enterprises is uneven, and the poor quality glue will produce formaldehyde emission exceeding the standard. Floor.
How to buy a floor? Reaching the environmental E1 level
Many citizens have equated formaldehyde with "poison". In fact, low concentrations of formaldehyde are common in nature, and there is trace amount of formaldehyde in clothes, apples and other foods. It is a normal phenomenon that wood products contain formaldehyde. The key is to release the amount in a reasonable manner, and the formaldehyde control should be closed in the wood product without dissipating.
Gan Chao introduced that the national mandatory standards stipulate that there is a formaldehyde emission requirement for solid wood composite flooring, laminate flooring and bamboo flooring. The commonly used testing method is the dryer method. At present, the release of formaldehyde from wooden floors is carried out by the mandatory national standard GB18580-2001, which stipulates that the formaldehyde emission of artificial wood products is 1.5mg/L, which is E1. The formaldehyde emission of 0.5mg/L reaches the E0 level and is a recommended standard.
How do people buy safe and secure floors? Gan Chao said that it is not appropriate to excessively pursue high standards and high standards. At present, the brand of wood flooring on the market is dazzling, and three products are everywhere. When consumers buy, try to find the floor with high reputation and brand ring in the market. The formal flooring company's product packaging is printed or labeled with clear Chinese signs, such as the name of the manufacturer, the site, the implementation of the standard number, product name, specifications, wood name, grade, quantity and batch number, etc.; The information can be considered as inferior floor or triple floor, and the possibility of "poisoning" is greater.
Gan Chao said that when the citizens purchase, they can also let the sellers present the recent floor inspection report, and see if the report is issued by a nationally recognized statutory authorized testing agency; it is also necessary to see the batch of products detected in the report and themselves. Are you buying the same batch?
Summary: Indoor air pollution caused by home decoration is often caused not only by formaldehyde in a single material. Paints, paints, furniture, etc. may contain harmful substances such as formaldehyde during the decoration process. Sometimes the formaldehyde content of a single product is not exceeded, but the qualified products in the house are used much more, and the cumulative amount will exceed the standard. While paying attention to the environmental protection indicators of individual materials, we must also pay attention to the indoor air pollution caused by the excessive use of household decoration materials and formaldehyde superposition.
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