Editor's note: There are four types of common flooring, solid wood flooring, engineered wood flooring, laminate flooring, and bamboo flooring. Recently paid attention to the "poisonous" floor, mainly refers to those with excessive formaldehyde emission of laminate flooring.

On-line exposure Anxin solid wood composite floor formaldehyde emission exceeded the standard, known as "poison floor." The problem of environmental protection in the decoration of man-made boards such as wood floors and engineered wood floors has aroused widespread concern. Gan Chao, an expert at the Jiangsu Provincial Quality Inspection Institute Chemical Building Materials Center, was interviewed by the newspaper to teach you how to choose a safe and environmentally friendly floor.

Hot water bubble floor test formaldehyde? It makes sense but it doesn’t depend on the “toxic floor” incident on the Internet. Vanke Real Estate announced that it will thoroughly investigate all properties that use Anxin flooring. Although Vanke and more than 40 cities nationwide issued a total of 163 re-examination reports on Anxin Floor, in addition to Vanke Foshan's real estate floor formaldehyde exceedance, the other test results are in line with national standards.

The uneven quality of flooring on the market, how to buy a safe, secure and durable floor, for a time to make consumers painstakingly, the Internet also reported a simple method of measuring formaldehyde: "take a small sample, go home and soak in boiling water 3-5 minutes, smelling smell is not exciting.A good floor due to the lower formaldehyde emission, generally do not smell pungent odor.If you smell more exciting strange smell, even the eyes feel uncomfortable, basically It was determined that the floor formaldehyde exceeded the standard."

Is this method of measuring formaldehyde reliable? According to Gan Chao, an expert from the Jiangsu Provincial Quality Inspection Institute Chemical Building Materials Center, there is a certain basis but the test results are not reliable. "Formaldehyde dissolves in water, and its aqueous solution is formalin." Gan Chao explained that formalin emits a pungent odor, and floors with excessive levels of formaldehyde soaked in boiling water will have a pungent odor. However, this test method is very rough, and the pungent odor does not necessarily mean that the floor formaldehyde exceeds the standard. It may be that the floor formaldehyde emission is below the critical value and is still qualified.

Formaldehyde GB inspections must be conducted under specified conditions, and the requirements for procedures, tools, environmental conditions, and inspection personnel are stringent. For example, the formaldehyde test includes the extraction method and the desiccator method, and the citizens are unlikely to satisfy these conditions when self-testing, and it is difficult to use the online legendary detection method as a reference.

Where does "toxic" floor formaldehyde come from? Poor glue results in excessive formaldehyde. There are four types of common flooring: solid wood flooring, engineered wood flooring, laminate flooring, and bamboo flooring. Recently paid attention to the "poisonous" floor, mainly refers to those with excessive formaldehyde emission of laminate flooring.

Gan Chao introduced that the reinforced laminate flooring is generally composed of a four-layer structure. The floor surface is a wear-resistant layer, mainly composed of aluminum oxide, and has strong wear resistance and hardness. This is followed by a decorative layer, which is a layer of paper impregnated with melamine resin. There is also a base layer, the main structure is medium and high density fiberboard, processed 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 play a role in moisture proofing and floor deformation. Solid wood composite panels use plywood as the substrate to bond the veneers together.

Laminate flooring and engineered wood flooring are glued together to produce formaldehyde, which has less adhesive and poor floor drain performance. The more formaldehyde, the higher the adhesion fastness. Formaldehyde itself is inevitable. Gan Chao said, “Floure urea-formaldehyde rubber and phenolic resin are commonly used in floor production. The content of phenolic formaldehyde is low, but the price is high.” The quality of glue used by production companies is uneven, and poor quality glue will create excessive formaldehyde emission. Floor.

How to choose floor? To achieve environmental protection E1 level Many citizens have put formaldehyde on the equal footing with “poison”. In fact, low-concentration formaldehyde is common in nature, and trace amounts of formaldehyde are found in clothes, apples and other foods. Wood products contain formaldehyde is a normal phenomenon, the key is in a reasonable amount of release, but also to control formaldehyde in the wood products are not dissipated.

Gan Chao introduced that the national compulsory standards require that the solid wood laminate flooring, laminate flooring, and bamboo flooring have formaldehyde emission requirements. The commonly used detection method is the dryer method. At present, the implementation of formaldehyde emission of wood floor is a mandatory national standard GB18580-2001, which stipulates that the release amount of formaldehyde from artificial wood products reaches the level of E1 at 1.5 mg/L. Formaldehyde release 0.5mg/L to E0, is a recommended standard.

How can the public buy safe flooring? Gan Chao said that it is not advisable to excessively pursue high standards and select E1 products. At present, the wooden floor brands on the market are more dazzling, and three products are everywhere. Consumers look for floors that are well-known and brand-named on the market. The product packaging of the formal flooring company is printed or affixed with a clear Chinese mark, such as the name of the manufacturer, the site, the implementation of the standard number, product name, specifications, timber name, grade, quantity and batch number, etc.; The information can be identified as poor floor or three floors without floor, and there is a high possibility of "poisoning".

Ganchao Zhizhao said that when purchasing, the public can also allow the seller to present the floor inspection report recently. It is necessary to see whether the report is issued by a statutory authorized testing agency recognized by the state; it is also necessary to see clearly the batches of products tested in the report and themselves. The same batch was purchased.

Summary: Indoor air pollution caused by home decoration is often caused not only by excessive formaldehyde in a single material. During the renovation process, paints, paints, furniture, etc. may contain harmful substances such as formaldehyde. Sometimes the formaldehyde content of a single product does not exceed the standard, but the qualified products in the house are much used, and the cumulative amount will exceed the standard. While paying attention to the environmental indicators of individual materials, we must also pay attention to indoor air pollution caused by superimposed formaldehyde due to excessive use of home decoration materials.