[ Chinese wardrobe network ] What is formaldehyde?
Formaldehyde is a simple chemical composed of hydrogen, oxygen, and carbon. It is naturally produced and is the product of many natural processes. It is produced by our body and is present in the air. Plants and animals also produce formaldehyde. Formaldehyde is found in many fruits and vegetables, and by-products are produced when cooking certain vegetables such as kale and cabbage. This chemical breaks down quickly and is metabolized into simple carbon dioxide. Our body easily breaks down the low amount of formaldehyde that comes from everyday contact.
Formaldehyde is also a combustion product associated with the combustion of kerosene and natural gas, automobile exhaust emissions, and cigarettes. This is an important industrial chemical used in the manufacture of many consumer products, including non-iron fabrics and even toothpaste.
How much formaldehyde is there in the wood?
All wood species, as well as all wood products, contain and release small amounts of formaldehyde. Since formaldehyde is naturally found in wood, there is no such thing as "zero formaldehyde" wood. For example, an oak tree emits 0.009 million parts of formaldehyde. For its part, this is a very low amount, but dense forests can have higher concentrations. Therefore, any wood cut from the oak contains a small amount of formaldehyde, which is the case for all wood products.
Formaldehyde release and its regulatory exemptions
Due to the impact of the hurricane in the Gulf of Mexico, the Federal Emergency Management Agency (FEMA) provided victims with trailers and mobile homes as temporary housing. Recent news reports have highlighted concerns about whether formaldehyde concentrations in these temporary housing affect health. The APA Engineering Woods fact sheet also expresses concern about the relevant structural wood panels and explains why the formaldehyde emissions from the plywood and oriented strand board produced according to the US product standards PS 1 and PS 2 are so low that they are authoritative. Formaldehyde emission standards and regulations are exempt.
Formaldehyde regulations and structural wood products
Structural wood products such as structural plywood and oriented strand board (OSB boards) are manufactured to meet stringent product standards, including the voluntary product standard PS 1-07 for structural plywood and the voluntary product standard PS 2 for performance standards for wood based structural boards. Since wood products are produced according to these standards and are suitable for buildings that meet building codes, they are only made with moisture-proof adhesives to meet outdoor Exterior or Exposure Level 1 exposure levels. These adhesives, including phenolic resin gums and isocyanate (MDI) gums, chemically react to a stable bond during hot press forming. This allows the final product to have low formaldehyde emission levels, meet the following world-standard formaldehyde release standards and regulations, or meet the exemption level:
1. Prefabricated residential standards of the US Department of Housing and Urban Development. This standard specifies that the emission limit of non-structural plywood judged by the American ASTM E1333 method is 0.20 ppm. Phenolic bonded structural plywood is immune to testing and certification due to its extremely low formaldehyde emissions. Although the oriented strand board is not specifically limited, the phenolic adhesive suitable for the panel can also be used by the oriented structural particle board product conforming to the voluntary product standard PS 2, which has been widely accepted.
2. Air Toxicity Control Measures for Integrated Wood Products of the California Air Resources Board (CARB). This regulation, developed by the California Environmental Protection Agency and planned to take effect on January 1, 2009, is considered to be the most stringent formaldehyde emission regulation in the United States. Recognizing the different formaldehyde wood products, the definition of No. 8 explicitly exempts "structural plywood", "structural panels of different types of emission levels", "structural composite wood", "oriented strand board", "glued wood" and "prefabricated I-shaped wooden joists."
3. According to the Japanese Agricultural Standard (JAS), wood-based structural panels need to meet the most stringent formaldehyde standards (F ★ ★ ★ ★), using JIS A 1460 testing method, below the average emission level of 0.30 mg / liter. The PS1 and PS 2 panels can easily meet the F★★★★ requirements. The formaldehyde emission regulations for this wood-based structural panel are recognized as the most stringent in the world.
4. Oriented strand board sold to the European market must meet the EN 300 standard and be rated for formaldehyde emissions using the EN-7171 formaldehyde test chamber test method. Structural plywood sold to Europe must comply with EN 636 and be evaluated for formaldehyde release according to EN717-1. Structural plywood and oriented strand board made with PS1 and PS 2 panels meet the E?1 formaldehyde emission limit of 0.124 mg per cubic in these standards.
Summary: some businesses to advertise on the market "zero formaldehyde" release wardrobe actually misleading propaganda, hype, consumers should be careful distinction when ordering custom closet treatment, do not blindly ordering, choose low formaldehyde emissions overall custom plate Wardrobe .
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