Formaldehyde and environmental standards for the overall wardrobe
[ Chinese wardrobe net ] Formaldehyde (HCHO), also known as ant aldehyde, colorless gas, has a spicy pungent odor. The gas density is 1.067 kg / m 3 and is easily soluble in water and ethanol. It is gaseous at normal temperature and usually appears in the form of an aqueous solution. It is a very strong fungicide with antiseptic, sterilization and stabilizing effects. 35-40% of formaldehyde solution is commonly known as "formalin". It has been identified as a carcinogenic and teratogenic substance by the World Health Organization.
Reasons for the production of formaldehyde from wood-based panels
(1) When the wood itself is dry, formaldehyde is generated due to internal decomposition. The smaller the density of wood, the stronger the ability to disperse formaldehyde.
(2) Glue used for bonding the substrate of the board is one of the main reasons for the production of formaldehyde. At present, the main glues on the market are urethane aldehyde glue and melamine glue. The production process of urethane aldehyde glue is simple, and the equipment requirements are not high. Most of them are produced by many small workshops, but the formaldehyde emission is large, but because of its low price. It is mainly used by wood board, medium and low density fiberboard when the substrate is bonded with a large amount of glue. The tripoly hydrogenamide glue is a new type of environmentally friendly glue, and its production process and equipment requirements are relatively high. The content is lower, but the price is much more expensive than urethane aldehyde glue, generally used for high-grade plates.
The effect of formaldehyde on human health
Mainly in the sense of olfactory abnormalities, stimuli, allergies, abnormal lung function, abnormal liver function and immune dysfunction. When the concentration reaches 0.06-0.07 mg/m3 per cubic meter of air, mild asthma occurs in children. When the formaldehyde content in the indoor air is 0.1 mg/m3, there is odor and discomfort; when it reaches 0.5 mg/m3, it can irritate the eyes and cause tearing; when it reaches 0.6 mg/m3, it can cause throat discomfort or pain. Higher concentrations can cause nausea and vomiting, cough and chest tightness, wheezing and even pulmonary edema; when it reaches 30 mg/m3, it will immediately cause death.
Environmental standards
The environmental protection method for wood-based panels is to use the method of perforation, and the amount of formaldehyde taken out from the board is measured after the sheet is passed through a certain number of holes. The standards currently referenced on the market are roughly classified into national environmental standards and European standards. The parameters are:
National standard (GB 18580-2001, GB/T 17657-1999)
Table 1 Test methods and limit values ​​of formaldehyde emission in wood-based panels and their products
product name
experiment method
Limited value
Scope of use
Limited
Sign b
Medium density fiberboard, high density fiberboard, particleboard, oriented strand board, etc.
Perforation extraction
≤9mg/100g
Can be used directly indoors
E1
≤30mg/100g
Must be used for interior treatment after finishing treatment
E2
Plywood, decorative veneer veneer, blockboard, etc.
Dryer method
≤1.5mg/L
Can be used directly indoors
E1
≤5.0mg/L
Must be used for interior treatment after finishing treatment
E2
Finished wood-based panels (including impregnated laminated wood flooring, solid wood composite flooring, bamboo flooring, impregnated film-finished wood-based panels, etc.
Climate box method
≤0.12mg/m3
Dryer method
≤1.5mg/L
Can be used directly indoors
E1
a climate box method is used for arbitration.
bE1 is a wood-based panel that can be directly used indoors, and E2 is a wood-based panel that is allowed to be used indoors after being treated.
European environmental standards
Formaldehyde content of E0 grade per 100 g of product ≤ 5 mg (≤ 5 mg / 100 g)
The formaldehyde content of E1 grade per 100 g product is ≤5-10 mg (≤5-10 mg/100g)
Formaldehyde content of E2 grade per 100 grams of product ≤10-30 mg (≤10-30mg/100g)
Aluminium Die-Casting Roaster,Aluminum Baking Pan,Cast Aluminum Roaster,Aluminium Roaster
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