in industrial processes of our country asbestos and asbestos materials are widely used.Asbestos belongs to a class of fine fiber materials of silicates and a Greek word asbestos is "indestructible", "unquenchable."An important characteristic of asbestos and asbestos products is their fire resistance, which allows to use them when you need to find a combination of flexibility and fire resistance of materials.Very often the use of asbestos as a raw material in the manufacture of flame retardant fabrics, cardboard.
asbestos board used in the engineering industry, and as a fire retardant in isolation storage tanks of flammable liquids.It is a unique insulating material made of asbestos.The main advantage of asbestos board - its resistance to high temperatures.It consists of a fibrous chrysotile asbestos mixed with a binder.The asbestos board contains up to 99% asbestos.
main advantages of asbestos board are:
- explosion and heat resistance, mechanical properties are maintained at temperatures up to 500 ° C;
- sufficiently high strength, and in the case of deformation due to mechanical impact insulating properties are maintained;
- no need for frequent replacement due to durability;
- ease of use.
asbestos board is supplied in sheets measuring 800 x 1000 mm with a thickness of 2 to 10 mm.
widespread in the industry were also asbestos cloth , asbestos cords, packings - all these materials made of asbestos.Asbestos is also used in the manufacture of various friction materials used in the manufacture of brake pads for automobiles.
It should be remembered that asbestos is divided into several types, some types of fiber can cause harm to human health.Hazardous types of fibers include anthophyllite, amosite, tremolite, united by a common name - amphibole.Asbestos fibers belonging to this species have a high hardness and look like sharp needles.At the same time, chrysotile asbestos fibers having a soft and elastic needle is quite safe for the human material.The cause of the danger of amphibole asbestos materials is their resistance to acids, ie, getting into human lungs, they are virtually eliminated from the body.Conversely, chrysotile asbestos fibers are easily degraded by mild acids and excreted.
asbestos in nature occurs at shallow depths, so it is mined by open-miner.Man trying to find a replacement for asbestos because of its danger to the application, but this is the only material with a set of characteristics, only asbestos inherent performance properties.
to asbestos are requirements in accordance with GOST 12871-93, according to which asbestos is divided into 8 groups according to the size of the particles.The labeling of asbestos in accordance with the guests should be given the name of the manufacturer, brand, batch number and weight of asbestos, date of manufacture and warning labels and product labels.
Chrysotile asbestos is packaged in paper or synthetic bags which must guarantee the safety of asbestos throughout the warranty period of storage.
