E0 grade, that is, the formaldehyde content of solid wood composite floor should be less than 0.5mg/m2.

For E 1 grade, the formaldehyde content of solid wood composite floor must be less than 1.5mg/m2.

At present, the top ten brands of wood flooring in the market are generally E 1 products, and such solid wood composite flooring belongs to environmental protection products.

Extended data

1, multi-layer solid wood floor is a tongue-and-groove floor with plywood as the base material, and the surface layer is inlaid with hardwood chips or sliced veneer of rare trees, which is pressed with urea-formaldehyde resin adhesive. Its panel adopts the most popular rare tree species in the world today, and it is made by bonding and pressing multiple layers of criss-crossing wooden boards through special technology, and the whole structure is solid wood.

2. The health hazards of formaldehyde mainly include the following aspects:

A. irritation: the main harm of formaldehyde is irritation to skin and mucosa. Formaldehyde is a toxic substance in protoplasm, which can combine with protein. Inhalation of high concentration will cause severe irritation and edema of respiratory tract, eye irritation and headache.

B. Sensitization: Direct skin contact with formaldehyde can cause allergic dermatitis, pigmentation and necrosis, and inhalation of high concentration formaldehyde can induce bronchial asthma.

C. Mutagenesis: High concentration of formaldehyde is still a genotoxic substance. Experimental animals can cause nasopharyngeal tumors under the condition of high concentration inhalation in laboratory.

D, outstanding manifestations: headache, dizziness, fatigue, nausea, vomiting, chest tightness, eye pain, sore throat, loss of appetite, palpitation, insomnia, weight loss, memory loss, autonomic nervous disorder. Long-term inhalation by pregnant women may lead to fetal malformation or even death; Long-term inhalation by men will lead to male sperm deformity and death.

References:

Baidu encyclopedia-multilayer solid wood floor

Baidu encyclopedia-formaldehyde