Modern industry is characterized by aggressive environments and elevated temperatures.Therefore, it created the need for sealing materials that are able to work in harsh conditions.The requirements for this kind of materials are contradictory and quite complex.
On the one hand they must be resistant not only thermally but also chemically, but on the other hand - they should be flexible and should not dissolve in either a solvent or medium.
It is this universal sealing material is paronite.
Asbestos is a fairly complex form, which in its chemical composition contains:
- up to 70% asbestos;
- about 15% of synthetic rubber;
- about 8% curing agent such as sulfur;
- about 15% of the special fillers.
This is only approximate composition paronita.Asbestos is present in large quantities, allows the material to demonstrate high levels of thermal and chemical resistance.A synthetic rubber gives it more flexibility.
Note that paronit not undergo any biological effects.This feature allows you to extend its scope, for example, in the warm tropics, the desert or on cold continents.
changing the composition of fillers can get the most different kinds paronita.For example, the materials can operate in hostile environments, hydrocarbons or mixtures thereof.
Unfortunately, there is also a lack of paronita - high adhesion, iesticking to the sealing surfaces.This can seriously complicate the operation when removing or repairing equipment.But this disadvantage can easily be corrected - it is necessary to put a layer of graphite on the sealing surface.
paronita The manufacturing process is not complicated.The desired mixture of rubber, asbestos, mineral fillers and sulfur is first heated to the desired temperature, and then zavaltsovyvayut into sheets of desired thickness from 0.4 to 6 mm.The finished product is easy to check the strength - folded in half sheet should neither crumble nor other way to break down.
Scope paronita wide enough.At high pressure exerted on the sheet, paronit begins to flow, thus filling the holes of any kind.
gaskets PON-B, and is used in piping and equipment operating in the saturated steam and various gases in the environment (dry, inert, neutral).As the cushioning material paronite PONT-A is widely used in compressors, industrial units, in pipelines.Its quality does not change under the influence of oil (both heavy and light) and in a medium which contains a sufficiently large amount of nitrogen and oxygen.
Thus, they can be sealed sorts apparatus metallurgical, chemical and petrochemical industries, working with rather aggressive substances at high temperature (distillation apparatus, scrubbers, distillation column, etc.).
