Answer: Formaldehyde (HCHO), also known as aldehydes, is a colorless gas with a spicy, pungent odor. The gas density is 1.067 kg/m3 and is easily soluble in water and ethanol. It is gaseous at normal temperature and usually appears as an aqueous solution. It is an extremely strong bactericide with antiseptic, sterilizing and stabilizing effects. It has been identified by the World Health Organization as a carcinogenic and teratogenic substance. 35-40% of the aqueous formaldehyde solution is commonly called "formalin".
In the field of medicine and biology, the pathological section and animal specimens are soaked with a 35-40% aqueous solution of formaldehyde, which has antiseptic effect; in the textile industry, formaldehyde is a softener used in dyes and clothing finishing, and slurry for leveling. A kind of chemical auxiliaries required; In the building materials industry, formaldehyde is an important raw material for the manufacture of urea-formaldehyde resins and phenolic resin adhesives for coatings, paints, and man-made sheet industries.
In addition to the above-mentioned functions, formaldehyde also has a strong carcinogenic and cancer-promoting effect. A large number of documents indicate that the effects of formaldehyde on human health are mainly manifested in abnormal olfactory sense, irritation, allergy, abnormal lung function, abnormal liver function, and abnormal immune function. When the concentration reaches 0.06-0.07 mg/m3 per cubic meter of air, children will experience slight asthma. When the formaldehyde content in the indoor air is 0.1 mg/m3, there will be odor and discomfort; when it reaches 0.5 mg/m3, it will cause eye irritation and cause tearing; reaching 0.6 mg/m3 may cause throat discomfort or pain. At higher concentrations, nausea and vomiting, coughing, chest tightness, wheezing, and even pulmonary edema can be caused. When it reaches 30 mg/m3, it will immediately cause death.
The World Health Organization (No. 153) issued in 2004 determined that formaldehyde is carcinogenic and is classified by the country as a highly toxic chemical. It can strongly stimulate the eyes, skin, respiratory mucosa, etc. Eventually it will cause abnormal immune function, liver damage and nervous system. Affected, can cause fetal malformations, leukemia, chronic respiratory diseases, female menstrual disorders, acute depression, nasopharyngeal cancer and other diseases..
Generally derived from wood-based panels, furniture, plastic wallpapers and paints, etc., which are used in a large amount of adhesives. Formaldehyde will evaporate from these materials once the furniture is heated and becomes hot.
“Technical Requirements for National Environmental Labeling Products--Artificial Wood Panels†stipulates: formaldehyde emission from man-made boards should be less than 0.20 mg/m3; formaldehyde emission from wood floors should be less than 0.12 mg/m3..
Say that 0.2 should be correct, 0.3 would be excessive, short-term problems would not be big, and some people with good constitution would not be too problematic. In short, everything was careful not to make a big mistake..
Nature flooring sheet formaldehyde furniture coating home improvement paint
Precautions for piston rod seal during transportation, installation or use:
1. The wrong installation direction of the seal causes leakage.
2. During installation, foreign matters and dust mixed into the cargo pipeline enter the sealing chamber to cause leakage
3. The seal is damaged due to poor assembly, resulting in leakage.
4. There are scratches on the surface of the sealing rod to cause leakage.
5. The piston rod is not concentric, and variable load causes leakage.
Common faults, causes and troubleshooting of piston rod seal:
Common faults
1. The size of the friction pair is inappropriate, causing wear;
2. Improper thread guide angle of cylinder barrel and piston end wear sealing ring;
3. The seal ring is worn due to improper installation guide angle of the seal;
4. The surface of cavity and piston rod is rough, with scratches and worn seals.
Troubleshooting:
Replace the seal.
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