A few days ago, a floor company in Tianjin announced the launch of "formaldehyde-free" floor, which once again stirred the sensitive nerves of the industry and consumers. Does "formaldehyde-free" floor exist and how should floor formaldehyde be treated correctly? In response, the reporter launched an investigation.
"Formaldehyde-free" composite flooring is questioned
During the just past 3.15, Tianjin Jinweilun Wood Co., Ltd. announced the launch of "formaldehyde-free" solid wood composite flooring. The company ’s national building material testing center, national wood-based panel and wood and bamboo quality inspection center were provided by the company. The test report and evaluation report issued show that the floor samples submitted for inspection are "not detected" under the formaldehyde test project.
According to Dai Wubing, chairman of Jinweilun Wood Co., Ltd., at the product launch conference, the floor uses a long molecular chain resin that does not contain aldehyde groups for a reasonable ratio, and a special process is used to form a crystal layer and a bonding film layer between the wood. High-efficiency bonding is achieved, so the formaldehyde is eliminated from the bonding process.
However, when the reporter visited the floor exhibition area of ​​the home store, he found that most merchants generally reflected that the concept of "formaldehyde-free" on the floor was more than practical. On March 30, the reporter saw in Shilihe Actual Home, Midland Realm and other stores that most floor brands displayed product test reports or copies in a prominent position in the store to dispel customers' doubts about whether the formaldehyde content exceeded the standard.
When the reporter randomly asked whether the sales staff of floor brands such as Living Home, European, Home and Jia had "formaldehyde-free" parquet for sale, the answer was basically the same: "As long as it is solid wood flooring, it must contain glue. There must be formaldehyde. If you want to be formaldehyde-free, you can only choose pure solid wood flooring. "Some sellers even pointed out sharply that" formaldehyde-free "is just a few companies who are taking advantage of everyone when they talk about aldehyde color change.
"Not detected" does not mean that the formaldehyde content is zero
At present, the mainstream production technology of the plate industry worldwide uses a large amount of formaldehyde-containing binders, so it is reasonable to be questioned once the concept of "formaldehyde-free" is thrown out. Under the current technical conditions, can composite floors be completely aldehyde-free?
Wang Yong, general manager of Beijing Dehejia Wood Industry Co., Ltd. pointed out that formaldehyde-free flooring is the direction of everyone's efforts. However, under current conditions, the technical indicators of density and water absorption expansion rate of composite flooring require formaldehyde to maintain balance. Floor products using aldehyde-free adhesives cost more at first, and their selling price also imposes huge pressure on consumers. Secondly, after leaving formaldehyde, the comprehensive performance of the floor is difficult to stabilize, and may not meet the national standards for wood-based panels.
Many industry insiders pointed out that formaldehyde is an excellent material to increase the viscosity and adhesion of glue, and the "undetected" formaldehyde of composite flooring is not equivalent to zero formaldehyde content. Another floor manufacturer and distributor said that even if zero formaldehyde is really achieved, it does not mean that other harmful substances are eliminated, such as benzene and VOCs contained in the surface coating of the floor are also the culprits of indoor pollution.
In this regard, Fang Chongrong, deputy secretary general of the China Forest Products Industry Association Floor Professional Committee, pointed out that, theoretically, pure solid wood flooring does not contain formaldehyde, and if composite flooring uses aldehyde-free glue, it can be as aldehyde-free as natural solid wood flooring. However, the actual test found that natural wood may also contain trace aldehydes less than 0.1 mg per liter. In addition, the existing conditions cannot detect the formaldehyde content, only that its content is extremely low and not non-existent.
Can be purchased to meet E1 standard
From the analysis of experts, it can be seen that the formaldehyde content of the floor is hardly zero, but can only be approached to zero indefinitely. In this case, in the face of formaldehyde that cannot be rid of, what kind of flooring products can consumers choose with confidence?
Any consumer who has experience in purchasing flooring knows that after introducing various excellent properties of the product, the salesperson always forgets to add a sentence, "Our products have reached the XX standard, and the formaldehyde content is less than XX mg per liter." Specifically, some businesses moved out of the national E1 standard, some claimed to meet the stricter E0 standard than E1, some proposed the American Carb certification, and some introduced the Japanese F four-star standard. Different standard systems and different formaldehyde limits make it easy for amateur consumers to listen to the fog and make it difficult to purchase.
Fang Chongrong said that the E0 level (formaldehyde emission ≤0.5mg / L) that merchants often say is only the industry standard for solid wood composite floor substrates, and the current national standard for composite floor products is GB18580-2001 "Interior Decoration Materials "Formaldehyde emission limit standard in wood-based panels and their products", that is, the formaldehyde emission level is required to reach E1 level, less than or equal to 1.5 milligrams per liter, products that meet this standard can be regarded as harmless to human health. Current mainstream flooring companies in the industry can all reach this level, and consumers can purchase with confidence without having to be too harsh on product standards.
Formaldehyde analysis
Formaldehyde is mainly produced in composite flooring
According to Song Guangsheng, director of the National Indoor Environmental Quality Supervision and Inspection Center, because formaldehyde has strong adhesion, and also has the function of strengthening the hardness of the plate, as well as the anti-insect and anti-corrosion, it is regarded as the main component of the adhesive. And because the glueless bonding technology is not suitable for large-scale industrial production and the strength is insufficient, most domestic flooring companies currently use adhesives that are formaldehyde-based urea-formaldehyde resin adhesives.
Among the three categories of flooring products, pure solid wood flooring is made of natural wood after drying and processing. No adhesive is used in the production process, so the floor formaldehyde is mainly generated from solid wood composite floors and reinforced composites that use a large amount of adhesive Among the floors.
Misunderstanding
How to tell if the floor is environmentally friendly?
Experts pointed out that if consumers want to verify whether the floor is environmentally friendly, they should seek an indoor environmental monitoring company with CMA national measurement certification after laying the floor and before the furniture is settled in, and arrange a door-to-door service. Generally, each governance company will require the owner to close the doors and windows of each room separately for 12 hours to conduct air sampling and issue a test report. Consumers can use this report to protect their rights.
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