Toluene is a colorless, clear liquid. Have a benzene-like smell. Strong refraction. It is miscible with ethanol, ether, acetone, chloroform, carbon disulfide and glacial acetic acid, and is very slightly soluble in water. The relative density is 0.866. Freezing point -95 ° C. The boiling point is 110.6 ° C. The refractive index is 1.4967. Flash point (closed cup) 4.4 °C. Flammable. Vapor can form an explosive mixture with air with an explosion limit of 1.2% to 7.0% by volume.
Toluene is widely used as a solvent and high-octane gasoline additive. It is also an important raw material for organic chemicals. However, compared with benzene and xylene obtained from coal and petroleum at the same time, the current production is relatively surplus, so a considerable amount of toluene is used for the removal. The alkyl group is benzene or deuterated to produce xylene. A series of intermediates derived from toluene, widely used in dyes; pharmaceuticals; pesticides; explosives; additives; the production of fine chemicals such as perfumes, also used in the synthetic materials industry.
The main hazards and common harmful factors in the production process are: flammable, mixed with air can become an explosive mixture. There is a danger of fire and explosion when exposed to fire, high temperature and strong oxidants. Its steam is heavier than air, and it can spread farther down the low point, and it will burn back when it is exposed to fire. It has mild irritating effect on skin and mucous membrane and anesthesia effect on central nervous system. Toxic, the maximum allowable concentration in the air of the workshop is 100mg/m3.
Health hazard: Irritating to skin and mucous membranes, anesthetic effect on the central nervous system.
Acute poisoning: Inhalation of higher concentrations in a short period of time may cause obvious irritation of the eyes and upper respiratory tract, conjunctival and pharyngeal congestion, dizziness, headache, nausea, vomiting, chest tightness, weakness of the limbs, gait, and confusion. Severe cases may have convulsions, convulsions, and coma.
Chronic poisoning: long-term exposure can occur neurasthenia syndrome, hepatomegaly, menstrual abnormalities of women workers. Dry skin, chapped, dermatitis.
Environmental hazard: It has serious harm to the environment and can cause pollution to air, water environment and water source.
Explosion hazard: the product is flammable and irritating
Testing equipment: toluene gas detector
Aluminum Precision Turned Parts
1. The hardness of the material is moderate, and the tool wear of the machining equipment and CNC machining center is small.
2. It can be precisely machined into various geometric shapes such as plane, cavity, shell, sphere, arc, and anisotropy.
3. It is not easy to stain and maintain. Aluminum precision parts, precision parts processing, CNC processing
4. It has good durability and is not easy to corrode. With special treatment process, the service life of parts is longer.
5. Aluminum is environmentally friendly and can be 100% recycled, with high recycling value.
The above five points are the material characteristics of aluminum products. Aluminum is a common material in CNC precision parts processing, with moderate hardness, durability and corrosion resistance. In addition, the cost of materials is appropriate. It is the preferred material for most parts manufacturers.
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