Recently, some businesses claim that gypsum, putty and other materials used for wall leveling contain "a large amount of building glue", which will cause harm to formaldehyde. In a word, many consumers began to worry about formaldehyde pollution in the wall materials used in their homes. But experts said, gypsum and other inorganic cementitious materials in addition to non-human added, there is no formaldehyde, and many building materials are not containing glue is harmful. As long as we buy qualified products and use them reasonably, we can ensure our health and consumers don't have to panic.
Gypsum and other formaldehyde free but beware of artificial addition
Gypsum, putty, white cement, etc. are building materials that we often need to use in wall construction. Do they really contain so-called building glue and emit a lot of formaldehyde? Ji Zhijiang, director of Environmental Functional Materials Research Office of China Academy of building materials science and Secretary General of ecological environmental building materials branch of China Building Materials Federation, said that cementitious materials are divided into inorganic cementitious materials and inorganic cementitious materials Machine cementitious materials, gypsum, white cement, lime powder belong to the former, they should not contain formaldehyde. There are also many kinds of organic cementitious materials, such as urea formaldehyde glue, which contains formaldehyde, while some kinds do not contain harmful substances, which need to be distinguished in detail according to the product formula.
However, in the actual construction, some workers in order to construct quickly and effectively, it is possible to artificially add glue to gypsum, white cement and other products. "For example, 802 glue, which contains formaldehyde." Therefore, the pollution problem does not come from gypsum and other products, but from irregular construction. Therefore, consumers should not misunderstand these materials.
As for putty, some experts say that its main material is mineral powder, so a certain amount of rubber powder must be added before wall construction. The limit of harmful substances in high-quality products should meet the national standards, and large-scale use will not cause harm. However, many owners are greedy for cheap or the construction team buys inferior putty powder to reduce the cost. In order to facilitate the construction, the workers may add glue and so on privately. The owner shall pay attention to the quality of putty powder used to avoid unnecessary pollution.
No formaldehyde in diatom mud with inorganic gelling agent
Diatom mud is a kind of environmental protection wall material favored by consumers in recent years. The wall surface is rich in shapes, but cementitious materials must be added. At present, there is a rumor that the glue added by diatom mud contains a lot of formaldehyde, and the thickness of the wall is large, so the harm is greater. Ji Zhijiang said it was nonsense. First of all, according to the provisions of decoration wall materials of diatom mud (JC / 2177-2013), the main binding materials of diatom mud are white cement, gypsum, white lime powder and other inorganic cementitious materials. As we mentioned above, formaldehyde is not contained in these materials except for human added. Ji Zhijiang said that due to the consideration of construction performance, organic additives (organic additives are also added to concrete) can also be added appropriately, but the VOCs can not exceed the standard. Therefore, as long as the products meet the standard, their environmental performance is guaranteed.
Latex paint has no "glue" formaldehyde, no necessary ingredients
When it comes to the name "latex paint", many consumers will first focus on the word "glue". Once brushing, found that there is a peculiar smell in the room, it will immediately be associated with whether the formaldehyde in the "glue" is acting strangely. In fact, latex paint is only a common term for interior wall coatings. The conventional coating is an organic and inorganic hybrid material, and its important component is synthetic resin emulsion. And formaldehyde, jizhijiang said, is to increase the shelf life of the paint tank. Some experts say that formaldehyde, as a harmful substance, is not an inevitable component of interior wall coating. In the early days, formaldehyde was often detected to exceed the standard because the manufacturer added formaldehyde as a preservative in the paint to extend the shelf life. In recent years, most of the manufacturers have changed the way of anti-corrosion, or added less formaldehyde to speed up the flow of products at the same time. The problem of formaldehyde exceeding the standard has been significantly improved.
Wang Shimin, manager of the quality inspection department of German all aromatic paint products, said that the smell of acrylic acid in the wall paint is natural and harmless to human body.
But when the paint barrel is opened, there is a pungent smell or aromatic smell, which indicates that there is a problem with the quality of the wall paint. If it is a pungent smell, it is likely to involve excessive formaldehyde. And aromatic fragrance is added to the flavor of products, to cover up some of the taste. In case of such a situation, the consumer should immediately replace the wall paint and cannot use it.