Paronite sheet is an asbestos or asbestos-free material made from:
- synthetic rubbers;
- various fillers;
- asbestos fibers;
- vulcanizing agents.
In the production process, the raw material mass is pressed, as a result, it is possible to obtain sheets whose thickness varies from 0.4 to 6 mm. Whereas the dimensions of the sheet itself may be different.
Areas of use
The aforementioned material is used to seal compounds that are exposed to aggressive environments or high temperatures during operation. Special properties allow the use of paronite in various fields of industry and the national economy, in:
- oil field;
- mechanical engineering;
- electric power industry;
- chemical industry;
The material is flexible, so it can be used in other areas, for example, in industries where the production of orthopedic elite mattresses and electric machines is established.
Specifications
Paronite sheet is well stamped. It is used in industry, and its density can vary from 1.5 to 1.8 g / cm 3 , but this value can be higher or lower. During long-term storage of the material, it does not deform, is not affected by fungi and bacteria, which allows its use in areas with a temperate and tropical climate.
The material is able to maintain properties at temperatures ranging from -50 to +490 ° . Elasticity testifies to quality, because when bent, the material is not covered by cracks and does not break.
Varieties of paronitis and their use
Sheet paronite is manufactured according to state standards 481-80 and is a general purpose material. It is used to seal stationary parts that are in workers in environments, among them are:
- ammonia gas;
- saline solutions;
- liquid oxygen ;
- petroleum products.
Today, varieties of paronite are known that can be used under the most severe conditions. For example, PON-A is used as a sealant for compounds that form the basis of equipment that operates in aqueous solutions of salts, in boiling liquid and steam.
Using PON-B, components of equipment and pipelines that are operated in dry, inert and neutral gases, as well as boiling water, are densified. Paronite is able to quite resistant to the effects of mineral oils.
Additional subspecies
There is another kind of paronite - PMB, which is designed for laying between elements of industrial units, compressors, between parts of internal combustion. This variety is also used for sealing compounds. It is characterized by stability of properties under conditions of exposure to environments with a high content of oxygen and nitrogen. This kind of paronite will not lose technical characteristics under the influence of various kinds of oil products.
To isolate the joints and parts of equipment that works in sea water, a variety of PMB-1 is manufactured. It is also used to seal elements of internal combustion engines. Sheet paronite is available in acid-resistant and electrolytic varieties, which are used for use in alkalis and aggressive acids.
Dimensions and weight of paronite
Weight of leaf paronite may vary depending on the variety. For example, if the PON thickness is 0.4 mm and the dimensions are 1x1 m, then the weight is equivalent to 0.8 kg. With an increase in size to 1.5x3 m, the weight will be equal to 3.6 kg, the thickness of the sheet remains the same.
With an increase in thickness to 1.5 mm, the weight of 1 m 2 will increase to 3.3 kg. If the dimensions are 1.5x1.7 m, the weight of the sheet will be 8.4 kg. The sheet of the largest size, the parameters of which are equal to 1.5 x 3 m, with a thickness of 1.5 mm will weigh 14.9 kg. This type of paronite is produced in the largest thickness equal to 6 mm, in this case a square meter will weigh 12.5 kg, whereas if the dimensions are increased to 1.5x3 m, the canvas will weigh 56.3 kg.
On sale you can find paronite sheet 2 mm under the marking PMB. If the sheet size of this variety is 1x1 m, then the canvas will weigh 4.5 kg. With an increase in size to 1.5x3 m, the weight will increase to 20.3 kg. Paronite sheet 3 mm with the same marking will weigh 7.5 kg, if the sheet size is 1 m 2 . With the increase in size to 1.5x1.5 m, the weight increases to 16.9 kg.
Production technology
In the manufacture of general purpose paronite, high-quality natural rubber is used. Some manufacturers with the shortage of this raw material can use synthetic rubber, its price, as well as quality, is slightly lower. Asbestos fibers give properties to paronite.
If the material will ultimately be used in difficult conditions, high-quality long-fiber chrysotile asbestos , which belongs to group 3 or 4, should be used in the production process. This is true if in the end it is necessary to obtain certain parameters, the main of which is the breaking load . The working temperature of such a material is +350 ° C.
When the material is supposed to be used in harsh conditions and at lower temperatures, and its working environment is +150 ° C, chrysotile asbestos belonging to group 5 or 6 is used in production.
Sheet paronite, the dimensions of which were mentioned above, can have different technical characteristics, which are affected by the amount of natural rubber used in the production. Certain technical parameters have the ability to give paronite if you use special additives in the right proportions.
Conclusion
Sheet paronite, a photo of which is presented in the article, is the most common and universal cushioning material. Its yield strength is 320 MPa. Once this level is reached, the material begins to flow, all leaks and joints are filled and sealed. To increase effective sealing, the thickness should be less, but it should be enough to fill in the irregularities of the joint and grooves. If a thicker gasket is used, then the likelihood of it being squeezed out increases, which can cause a leak in the connection.
An additional feature of paronite is the fact that it lends itself well to processing and cutting. It is possible to cut gaskets of arbitrarily complex configuration from it. They can be used in different climatic zones where the ambient temperature does not fall below -60 ° C. The material is not corrosive, and its density, depending on the thickness, varies from 1.8 to 2 g / cm 3 .