Wood Encyclopedia - Hazardous Substances in Wood

Wood furniture is a large variety of furniture. There are many kinds of products. There are also many raw and auxiliary materials used in the production of wood furniture. It basically involves forestry, chemical, metal, textile and other fields. The harmful substances in the products are mainly summarized into the following categories. .

Free formaldehyde

Formaldehyde (molecular formula CH2O) aqueous solution is also called formalin. Formaldehyde is a volatile substance. When the air contains a small amount of free formaldehyde, it will cause eye irritation and tearing. When the concentration of formaldehyde increases, people will feel itchy throat, nasal pain, chest tightness, cough, difficulty breathing, weakness and headache. Long-term work or living in a high concentration of formaldehyde, people will be chronically poisoned and can cause digestive disorders, visual impairment, and even nerve paralysis, respiratory mucosa and conjunctival ulceration.

The main source of free formaldehyde produced in wood furniture comes from three aspects: 1 artificial board, currently mainly medium density fiberboard, particle board, plywood and blockboard, etc., generally used as the substrate of furniture, of course, also including decorative wood-based panels . The 2 parts of the adhesive contain free formaldehyde. 3 The end faces of the parts of the wooden furniture are not edge-sealed and some of the connecting holes are installed in the section, and these parts are easy to release free formaldehyde.

In the manufacture of wood-based panels (including veneered wood-based panels), a large amount of synthetic resins such as urea-formaldehyde phenolic resin is used as an adhesive. Since urea-formaldehyde resin itself has good water solubility, low price, fast curing speed, high bonding strength, and good storage stability, it is widely used. Used in the processing and production of wood-based panels.

The urea-formaldehyde resin is a condensate of urea and formaldehyde. When the artificial board or the processed veneer is hot pressed, the pre-condensed urea-formaldehyde resin is reticulated by the curing agent and heat, that is, cured. After the hot pressing, a small amount of free formaldehyde remains in the artificial board. The linear resin in the artificial board which is not reticulated when solidified, and the partially cured resin will still decompose into free formaldehyde under certain temperature and humidity conditions. These free formaldehyde will continue to emanate during the use of furniture, causing environmental pollution and harm to human health.

2. Soluble heavy metals such as lead, cadmium, chromium and mercury

Lead, cadmium, chromium and mercury are common toxic substances that are clearly harmful to humans. In particular, lead can damage human nerves, hematopoiesis and reproductive system, which is very harmful to children and adolescents, affecting children's growth and development and intellectual development. Therefore, the control of heavy metal pollution such as lead has become a worldwide hot spot and development trend. Long-term inhalation of cadmium dust can impair kidney or lung function. Long-term exposure to chromium compounds causes dermatitis wet diagnosis. Chronic mercury poisoning mainly affects diseases such as the central nervous system.

The soluble heavy metals in wood furniture products mainly come from the paint film on the surface of the product. Especially in some color paint furniture, children's furniture occupies a certain proportion. The coating is mainly the color pigment of paint, such as red dan, lead and chrome. Yellow, lead white, etc. In addition, since inorganic pigments are usually made from natural minerals and processed through a series of chemical and physical reactions, it is inevitable to entrain trace amounts of heavy metals.

Outdoor Hanging

Outdoor Hanging refers to the act of suspending objects or decorations from a structure or tree in an outdoor setting. This can include hanging plants, outdoor Lighting Fixture, wind chimes, flags, and other decorative items. Outdoor hanging can be used to add visual interest and dimension to outdoor spaces, create a cozy and inviting atmosphere, or simply to add functionality to outdoor areas. It is important to consider the weight and durability of Lighting Product being hung, as well as the safety of the structure or tree being used as support. Proper installation and maintenance are also important to ensure the longevity and safety of outdoor hanging decorations.

Outdoor Hanging

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