Modern industry is characterized by aggressive environments and elevated temperatures. Therefore, the need is created for the use of sealing materials that are able to work in difficult conditions. The requirements for such materials are contradictory and quite complex.
On the one hand, they must be stable not only thermally, but also chemically, but on the other hand, they must be plastic and must not dissolve in any type of solvent or medium.
It is such a universal sealing material that is .
Paronite is a rather complex species, which in its chemical composition contains:
- up to 70% of asbestos;
- about 15% of synthetic rubber;
- about 8% of a vulcanizing agent, for example sulfur;
- about 15% of special fillers.
This is only an approximate composition of paronite. Asbestos, present in large quantities, allows the material to show high rates of thermal and chemical resistance. And synthetic rubber gives it extra ductility.
It should be noted that paronitis is not exposed to any biological effects. This property allows you to expand its scope, for example, in the warm tropics, desert, or on cold continents.
By changing the composition of the fillers, you can get a variety of types of paronite. For example, materials can work in aggressive environments of hydrocarbons or their mixtures.
Unfortunately, paronite also has a drawback - high adhesion, i.e. adhesion to sealing surfaces. This can seriously complicate the work of dismantling or repairing equipment. But this drawback can also be easily corrected - just put a layer of graphite on the sealing surface.
The process of manufacturing paronite is not complicated. The necessary mixture of rubber, asbestos, mineral fillers and sulfur is first heated to the required temperature, and then rolled into sheets of the desired thickness from 0.4 to 6 mm. The finished product is easily checked for strength - a bent sheet in half should neither crumble nor break in any other way.
The scope of paronite is quite wide. At high pressure exerted on the sheet, paronite begins to flow, thus filling any kind of holes.
PON-B gaskets are also used in pipelines and equipment operating both in saturated steam and in the environment of various gases (dry, inert, neutral). As a cushioning material, PON-A paronite is actively used in compressors, industrial units, and pipelines. Its quality does not change under the influence of petroleum products (both heavy and light) and in an environment where a sufficiently large amount of nitrogen and oxygen is contained.
Thus, they can compact various kinds of equipment of the metallurgical, chemical or petrochemical industry, working with fairly aggressive substances at high temperatures (distillation apparatuses, scrubbers, distillation columns, etc.).