There are three kinds of floors: pure solid wood flooring, reinforced composite flooring and solid wood composite flooring. And the wood composite floor includes: 3-layer solid wood composite floor, multi-layer solid wood composite floor, below to understand the formaldehyde content of various floors:

　　一、纯实木地板，是由整个木材加工而成，除了表面淋漆外没有其他装饰。这地板释放出的甲醛可以忽略不计。

　　1. Pure solid wood flooring is processed from the whole wood. There are no other decorations except the surface paint. The formaldehyde released from the floor is negligible.

　　实木复合地板，是由三层或多层实木片切贴胶粘压成基材，表面再贴细花纹的木皮压，经过油漆工艺等表面制作。实木复合地板的基材是多层胶合板，胶粘剂多为尿醛树脂胶，甲醛释放期长达15年。地板表面采用油漆面，起到了封闭甲醛释放的作用，但底面、侧面会有甲醛释放。

　　Solid wood composite flooring is made of three or more layers of solid wood chips cut and glued to form a base material, then the surface is pressed with fine-grained wood bark, which is made by painting technology and other surfaces. The base material of solid wood composite floor is multi-layer plywood. Most of the adhesives are uroformaldehyde resin. The release period of formaldehyde is up to 15 years. The floor surface is painted to block formaldehyde emission, but formaldehyde emission will occur on the bottom and side.

　　强化复合地板，是用高密度板纤维板做基材，表面有装饰层、耐磨层，背面加平衡层，经高温压制的地板。高密度纤维板的主要材料是木材纤维和胶粘剂，如ureal树脂胶粘剂，长期释放甲醛。从上图可以看出，实木地板的甲醛释放量几乎为零。

　　Strengthened composite floor is a floor made of high density board and fibreboard, with decorative layer and wear-resistant layer on the surface, balance layer on the back and high temperature pressing. The main materials of high density fiberboard are wood fibers and adhesives, such as ureal resin adhesives, which release formaldehyde for a long time. As can be seen from the above figure, the formaldehyde emission from solid wood flooring is almost zero.

　　一般来说强化复合地板引起的室内甲醛检测值一般在0.08毫克以下，有的甚更低，性能更好;实木复合地板甲醛污染比较高，多层实木复合地板导致室内甲醛检测值可能在0.1毫克以上，三层实木复合地板相对多层实木复合地板甲醛释放量少一些。

　　Generally speaking, the indoor formaldehyde detection value caused by laminated flooring is generally below 0.08 mg, some are even lower, and the environmental protection performance is better; the formaldehyde pollution of solid wood composite flooring is relatively high; the indoor formaldehyde detection value of multi-layer solid wood composite flooring may be more than 0.1 mg, and the formaldehyde emission of three-layer solid wood composite flooring is less than that of multi-layer solid wood composite flooring.