Which type of decoration board has the most formaldehyde pollution?

    Everyone knows that wood panels are a major source of indoor formaldehyde pollution. However, with so many different types of wood panels on the market, do we know which ones have the highest formaldehyde levels? Understanding the formaldehyde content of various types of wood panels can help us choose more environmentally friendly renovations and address formaldehyde pollution at the source.
       Density board (
       MDF) ranks first in the pollution index: Density board, which includes various fiberboards and particleboards used in interior decoration and furniture manufacturing, is a type of man-made board made by cutting wood processing residues, small-diameter wood, and sawdust into pieces of a certain size. After drying, mixing with glue, hardener, and waterproofing agents, and pressing under a certain temperature and pressure, it is pressed into pieces. Some fibers, such as bamboo, straw, and sugarcane bagasse, are also used. When this type of man-made board is coated with melamine, it is also called melamine board. It is estimated that the amount of formaldehyde-containing urea-formaldehyde resin adhesive required to produce each cubic meter of density board is generally 200-250 kg.

Blockboard

Second on the pollution index: Blockboard, commonly known as core board. Made by gluing and pressing two layers of plywood with a small wooden strip in the middle using urea-formaldehyde resin adhesive, it is a man-made board. The core is made of natural wood strips glued together, with thin veneer applied to both sides. As the name suggests, it's a primary material for interior decoration. Blockboard is currently widely used in both urban and rural interior decoration in my country. It can be used to make furniture, cover wooden doors and windows, radiator covers, and curtain boxes. Its waterproof and moisture-proof properties are superior to particleboard and medium-density fiberboard. However, the use of urea-formaldehyde resin adhesives can potentially cause formaldehyde pollution in indoor environments.

plywood

Third on the pollution index: plywood. This wood panel is made by steaming and softening logs, then cutting them into large thin sheets along their growth rings. The process then continues with drying, finishing, gluing, assembling, hot pressing, and sawing. Plywood should have an odd number of plies, typically 3 to 13, and the fibers of adjacent plies should be glued together perpendicularly. Plywood is primarily used in interior design and furniture manufacturing, in conjunction with solid wood, density fiberboard, blockboard, and finger-jointed boards. Its primary production process involves bonding three, five, seven, or nine layers of wood veneers together using urea-formaldehyde resin adhesive.

Multi-layer finger-jointed board

Fourth on the pollution index: multi-layer finger-jointed boards. These primarily include various multi-layer solid wood finger-jointed boards manufactured using urea-formaldehyde resin adhesives. Multi-layer finger-jointed boards typically consist of three layers, two of which are heavily coated with adhesive. However, because the "finger joints" of these boards are exposed to air, formaldehyde is more likely to volatilize.

Veneer

Fifth on the pollution index: Various veneers, also known as decorative veneers (also known as decorative veneer plywood). These are made by slicing natural or engineered wood into thin sheets of a certain thickness, adhering them to the surface of plywood, and then hot-pressing them. They are used as a surface material for interior decoration or furniture manufacturing. These artificial boards are glued to thin density fiberboard or particleboard to decorate furniture surfaces. They cannot be used alone and can only be attached to blockboard, plywood, or finger-jointed fir boards.

Solid wood finger-jointed board

Sixth on the pollution index: solid wood finger-jointed boards. Made from a single layer of solid wood, these boards are also called single-layer solid wood finger-jointed boards. The main manufacturing process for this type of board involves sawing various solid wood materials into small pieces, deep-drying them, then toothing the pieces. Urea-formaldehyde resin adhesive is then applied to the toothed areas and sides of the pieces, and then secured by extrusion. These boards are commonly used in some solid wood furniture as linings, panels, and partitions, and are a major source of formaldehyde pollution in solid wood furniture.