Oil-resistant technical sheet rubber. Nominal geometric parameters of products made of oil-resistant rubber. Technical characteristics of MBS rubber sheets

Rubber is a material that is obtained through the process of vulcanization of natural or synthetic rubber. It is used for the manufacture of tires for wheeled vehicles, seals, conveyor belts and many other products used in medicine, everyday life, etc. In particular, one of the products of rubber processing is sheet rubber (technical plate).

Types of rubber sheets

The fundamental document for sheet rubber manufacturers is GOST 7338-90. This document applies to rubber plates, which are intended for the production of parts used to seal fixed joints, preventing friction between the surfaces of parts made of metal. In addition, parts made of this type of rubber must withstand shock loads that can occur in machines and mechanisms operating in various industries and construction. The same documents define the types of rubber and the operating conditions for which they are intended. Thus, oil-resistant rubber has three degrees of hardness, and can operate at temperatures from -40 to +90 degrees Celsius. It must remain operational in environments containing fats, oils, emulsions, inert gases and steam.

GOST determines that, depending on the scope of application and operating conditions, three main types of technical sheet rubber are produced.

• heat-frost-acid-shallow-resistant (TMKShch);
• oil resistant MS;
• oil and petrol resistant MBS.

The TMKShch rubber plate remains operational in environments such as aqueous, acidic, alkaline and gas. It can be used, depending on the degree of hardness, from -45 to +90 degrees Celsius.

Oil-gasoline-resistant (MBR) sheet rubber can operate in oily or in environments in which hydrocarbon fuels are present. The operating temperature range is from -30 to +80 degrees Celsius.

Several other types of rubber are produced in sheet form:

• vacuum;
• silicone;
• spongy.

White vacuum rubber brand 7889 is distinguished by the following parameters - it is insensitive to high pressure and temperature, has high elasticity and at the same time it successfully resists compression. Vacuum rubber, in addition to sheet versions, can be supplied to the consumer in the form of sleeves, cords, etc.
Vacuum rubber also includes colored vulcanized sheet rubber. By the way, different colors do not carry any meaning. Such rubber is produced solely for aesthetic reasons.
Silicone sheet rubber is a material that is produced using high molecular weight substances, which include silicon and some organic substances. By appearance it is indistinguishable from that produced from ordinary rubber. But her chemical formula allows it to operate in a temperature range from -50 to +480 degrees Celsius. If the ambient temperature is no more than +100 degrees, then we can say that parts made of this type of rubber will work forever. By the way, working in such extreme conditions for a long time does not affect its operational workshops.

Spongy (porous) rubber is essentially foamed rubber that can be molded into sheets, etc. The industry produces several brands of these products, which differ from each other in density and areas of application. By the way, porous rubber is often used for creativity.

Food grade sheet rubber is produced in accordance with the requirements of GOST 17133-83. Products made from this material are used to make seals that come into contact with food substances.
The technical plate can be supplied to the customer in the form of plates of a certain size or in the form of rolls.

As already noted, the main technical parameters of sheet rubber are regulated in GOST 7338-90. By the way, in some documents you can find references to GOST 7339-65, which is no longer valid.

In particular, it determines that the finished product has the following dimensions:

Sheets width from 250 to 1350, length from 250 to 1000 mm.

Rolls width range from 250 to 1750, length can reach 10,000 mm.

The thickness of the technical plate ranges from 1 to 60 mm.

The specific gravity of the technical plate varies within 1000 g per 1 cubic meter. dm.

Specifications vacuum plate are supplemented with the following parameters:

The dimensions of the technical plates, mostly square in shape, are 500x500, 600x600, 700x700, etc.

It must remain operational at temperatures from -8 to +70 degrees Celsius.

The vacuum plate is produced in accordance with the requirements of TU 38105116-81.
Special transformer materials are also produced in the form of sheets or rolls. It is used in the production of transformers and other devices used in electrical engineering. Technical requirements are defined in GOST 12855.

Designation of sheet rubber

In order for consumers of products of this class to be able to easily navigate the nomenclature of rubber goods, a procedure for designating finished products has been determined. For example, the entry plate 2N-1-TMKShch-S-5 means that in front of the customer there is an unmolded (N) sheet of rubber (1) plate of the second class, medium hardness (C). TMKShch – plate grade. The last number indicates the thickness of the sheet.

Scope of application of sheet rubber

Technical plates produced in accordance with the requirements of GOS 7338-90 have found their application in various industries - mechanical engineering, aviation, machine tools, food, nuclear, etc. Products made from this material are used in the production of products used in healthcare, sports, etc.

Most often, sheet rubber is used for the production of insulating and sealing gaskets. In addition, it is used in shock-absorbing devices, etc.

Advantages and disadvantages of technical plates

Like any product, a technical plate has a number of advantages and disadvantages. The undoubted advantages include the fact that it is a heat-resistant product. As noted above, the maximum operating temperature range is from – 40/30 to +80 degrees Celsius, that is, frost resistance is also its advantage. Heat-resistant silicone rubber can withstand temperatures up to +400 degrees. The elasticity of sheet rubber allows it to be used in various moving mechanisms, for example, as protective covers. The technical plate has high wear resistance and this allows it to be used as blades on bulldozers. To do this, use a plate of the TMKShch brand.

• temperature regime;
• presence of aggressive environments;
• characteristics of physical impacts during the operation of rubber goods.

That is, how long and effectively the rubber goods will work depends on the correct choice of the brand of the base material. Meanwhile, most of the manufacturers who are guided by the requirements of the mentioned GOST find themselves in an ambivalent position.
The thing is that certain standards therein do not allow the production of truly effective materials. Part of the reason is that the consumer has a strong opinion that the technical plate, in its parameters, can exceed the requirements defined in GOST 7338-90.

For the manufacture of technical plates, which must meet the requirements of this mentioned document, it is enough to use cheap raw materials from the category of synthetic rubbers, namely styrene butadiene rubber, isoprene rubber, etc. As a result of this approach, the TMKShch plate can only work in 20% solutions of acids and alkalis and this is clearly not enough.

But the development of technology has led to a number of modern materials, for example, silicone rubbers have nothing to do with GOST 7338-90.
To overcome outdated GOST requirements, many enterprises in this industry are engaged in independent development and serial production of sheet rubber, which in its characteristics exceeds the standards of GOST 7338-90. This type of product includes the so-called branded rubber. For example, B-14. It is used to create oil and petrol resistant products that exceed standard ones in terms of parameters and cost. The factories manufacture these products on the basis of the specifications developed by them.
Of course, one cannot say that rubber-technical products that are produced on the basis of this normative document, are of low quality.

Most likely, the time has come to radically change the content of this document and enable manufacturers to calmly produce products that meet the technological requirements of our time.

Rubber technical plates MBS and TMKShch GOST 7338-90 are intended for the manufacture of rubber products used to seal fixed joints, prevent friction between metal surfaces, to absorb single impact loads, and also as gaskets, decking and other sealing joints.
Technical plates TMKShch work in the following environment: air, nitrogen, inert gases, water (fresh, sea, industrial, waste without organic solvents and fuels and lubricants), solutions of salts, acids, alkalis with a concentration of no more than 20%.
Classes of technical plates TMKShch:
1 class:
2nd grade:
Types of technical plates TMKShch:
N
F
Types of technical plates TMKShch:
I- rubber;
II- rubber-fabric.
Hardness of technical plates TMKShch (according to the Shore method):
M- soft (40-55);
WITH- average (55-70);
T- hard (70-90).
Example of a symbol:
Plate 2 N - I - TMKShch - S - 3 GOST 7338-90, Where:
2 – class;
N – non-shaped (type);
I – type (rubber);
TMKShch – brand (thermo-acid-alkali-resistant);

3 – thickness (mm).

MBS rubber technical plates(oil and petrol resistant) are designed to work in the following environments: petroleum fuels and lubricants, nitrogen, inert gases.
Classes of MBS technical plates:
1 class: for sealing units operating under pressure above 1 MPa (10 atm);
2nd grade: for sealing units operating under pressure less than 0.5 MPa (5 atm), for decking, linings for single impact loads, etc.
Types of MBS technical plates:
N- non-molded are manufactured without molds (in continuous vulcanizers) in the form of rolls or sheets of various lengths, thickness from 1 mm to 20 mm, width from 800 mm to 1400 mm;
F- molded ones are made by vulcanization in molds in the form of plates or sheets with a thickness of 3 to 80 mm, dimensions 720x720mm, 500x500mm, 520x520mm.
Types of MBS technical plates:
I- rubber;
II- rubber-fabric.
Hardness of MBS technical plates (according to the Shore method):
M- soft (40-55);
WITH- average (55-70);
T- hard (70-90).
The operating temperature of technical plates and products made from them is from -30°C to +80°C.
Example of a symbol:
Plate 2 N - I - MBS - S - 3 GOST 7338-90, Where:
2 – class;
N – non-shaped (type);
I – type (rubber);
MBS – brand (oil and petrol resistant);
C – degree of hardness (C – medium);
3 – thickness (mm).
The ratio of sizes, weight and type of packaging of rubber plates MBS and TMKShch:

Oil and petrol resistant rubber- high-quality rubber products, designated by the abbreviation MBS. This material is suitable for use in various environments. It is used in any premises, containers and vessels, also in environments with inert gases. Often such rubber is used in the energy sector if the main medium is oil..

Transformer rubber (oil-resistant rubber) is made from nitrile butadiene rubber (SKN-26, SKN-18) in the form of sheets with a thickness of 6 to 12 mm. Oil-resistant rubber is used to seal covers, bushings, and oil flanges. power transformers .

Purpose oil resistant rubber MBS– sealing connections that are not intended to be moving elements. This rubber can also be used as a gasket. Gaskets eliminate the possibility of friction between metal surfaces and withstand single impact loads well.

Sealing gaskets and rings for transformers are made from technical grade oil and petrol resistant rubber (MBR) by casting into special molds. It is recommended to cut rubber sheets up to 6 mm thick using punch knives.

Oil-resistant rubber for transformers is manufactured in 2 types:

• UM – universal oil-heat-freeze-resistant design
• OM – ozone-freeze-resistant

Nominal geometric parameters of products made of oil-resistant rubber

Technical performance rubber in media
and operating conditions GOST 12855-77

Quality control

The surface of technical rubber must be smooth. The following are not allowed on the main surface and sections of the product: inclusions and gas bubbles of more than 0.5 mm for plates up to 5 mm thick; 0.75 mm – for thicknesses 5-10 mm, 1.0 for thicknesses 10-20 mm; 1.5 mm for plates thicker than 20 mm. The total area of ​​air bubbles should not exceed 10 cm2. per 1 sq.m. products.

Folds formed during the bandaging process of the product should not exceed 4 mm in width, 100 mm in length and be greater than the tolerance range for the thickness of the roll in depth. Acceptable delamination along the edges and ends of the roll or plate is up to 5 mm in length and 1 mm in width.

Physical and mechanical properties

Marking

Each rubber product must be marked with indelible paint. Markings include:

• trademark
• symbol
• date of issue indicating quarter and year
• STK stamp

Transportation and storage

Transformer plates should be stored in closed warehouses at the following temperature conditions:

• from 0 to +25°C – normal storage mode, duration - within warranty period storage
• from +25 to +35°C – no more than 80 days
• from +35 to +40°C – no more than 15 days

If technical plates were stored in subzero temperatures, before use they should be kept for 3 hours at a temperature of 50°C, or for 24 hours at a temperature of 15°C. During storage, rubber products must be protected from direct sunlight, oil, gasoline, kerosene, their vapors, acids, alkalis, gases, as well as other substances capable of destroying rubber.

Transformer rubber sheets can be transported by all types of transport. When transporting in closed containers, the products may not be packaged.
If transformer plates are transported at temperatures below -30°C, the products should be reliably protected from impact loads and deformations. You can unpack technical plates after exposure to negative temperatures only after they have been kept for a day at a temperature from 0°C to +25°C.

Technical plate(technical plate) - a semi-finished product for the manufacture of various rubber products. Essentially, these are rolled rubber strips or a rubber sheet of a certain thickness. With all their diversity, technical plates are standardized according to GOST 7338-90. In industry and other sectors, technical sheet rubber is used in various conditions. They are affected by high and low temperatures, liquids and gases. Therefore, there are brands of technical plates that are more resistant to certain impacts. The composition of rubber and latex, from which rubber is obtained, is regulated.
vulcanization. At the SANTRADE company you can always buy technical plates and MBS of various thicknesses at the most low prices in Moscow.

Brands of standard technical plates GOST 7338-90

• TMKSH- heat, frost, acid and alkali resistant rubber.
• AMC- weather-oil-resistant rubber (with limited ozone resistance).
• MBS- oil and petrol resistant rubber.

Oil resistant rubber sheets can be used in nitrogen atmosphere or inert gases at quite high blood pressure. The exact permissible values ​​are given in the tables to the GOST 7338-90 standard.
Sheet rubber prevents fuel, oils and solvents from coming into contact with the surface unless its characteristics specifically indicate oil and petrol resistance, for example MBs rubber.

Technical plate TMKShch GOST 7338-90

• Heat resistance - maximum working temperature up to +80ºС.
• Frost resistance - minimum operating temperature from - 30ºС, and in some compositions from - 60ºС.
• Acid resistance - retains its qualities at acid concentrations of up to 20%.
• Alkali resistance - retains its qualities at alkali concentrations of up to 20%.

Heat-freeze-acid-alkali-resistant technical plate (TMKShch plate GOST 7338 90) can be used in salt sea water and wastewater from settling tanks. It withstands the effects of strong (completely dissociating) acids and alkalis in concentrations up to 20%. Rubber cannot be immersed in concentrated sulfuric or hydrochloric acid.

Technical plate MBS GOST 7338-90

Gasoline-resistant rubber has a temperature range from -40ºС to +80ºС. The working environment in which oil-resistant rubber exhibits its qualities most effectively is the air of rooms, containers and vessels; inert gases at a pressure from 0.05 to 0.4 MPa or oils and petroleum-based fuels, gasoline at a pressure from 0.05 to 10.0 MPa.

Gasoline-resistant rubber in accordance with GOST 7338-90 is manufactured in rolls with a thickness of 1 to 8 mm. Sheet rubber 10mm or more is produced in the form of sheets and squares. The oil and petrol resistant rubber presented by our company is manufactured by leading manufacturing plants in Russia - "Kurskrezinotekhnika" and "Saransk Rubber Products Plant".

Types, types and classes of rubber technical plates

• Rubber technical plates.
• Rubber-fabric technical plates. The number of layers of fabric may vary, but there should be no more than one per 2 mm of the thickness of the technical plate. By agreement between the manufacturer and the consumer, it is possible to produce technical plates with special parameters.

Technical rubber and its types:

• Shaped (pieces). They are produced by vulcanization directly in molds.
• Non-shaped (rolled). The continuously extruded mass is vulcanized.

Technical plate classes:

• Class 1. Used at pressures greater than 100 kPa. Thickness 1-20 mm.
• Class 2. Used under pressure less than 100 kPa. Thickness 1-60 mm.

Other characteristics of rubber plates

• Soft rubber plate (M) - hardness 30-50 units. Shora.
• Rubber plate of medium hardness (C) - hardness 50-65 units. Shora.
• Technical rubber sheet hard (T) - hardness 65-80 units. Shora.

Rubber technical plate is never ideal. It is allowed to have slight variations in tone, dullness, a coating of fading components, remnants of powder material, prints of fabric relief, protruding edges after pressing. Characteristics such as porosity, the presence of foreign inclusions, depressions and elevations should not exceed the values ​​​​defined by GOST 7338-90. Cracks and other serious damage are not allowed on technical plates.

Using technical plates

Technical rubber GOST 7338-90 and its markings

Rubber plate 2N-I-TMKShch S-5 GOST 7338-90

• 2N - class of technical plate (second class), type - non-shaped (rolled).
• TMKShch is a brand of rubber. (warmth-frost-acid-alkali-resistant)
• C - hardness. In this case, the plate is of medium hardness.
• 5 - thickness in mm.

Rubber plate 1F-I-MBS-M-3 GOST 7338-90

• 1F - class of technical plate (first class), type - shaped (cubes).
• I - subtype of rubber, in this case a rubber plate without a fabric layer.
• MBS - brand - oil and petrol resistant rubber.
• M - hardness. In this case, the plate is soft.
• 3 - thickness in mm.

• Trademark or manufacturer's name
• Stamp technical control
• Date of manufacture (year and quarter)

Why is it worth buying technical plate from our company?

1. Sheet rubber from 1 mm;
2. Sheet rubber from 2 mm to 50 mm;
3. Technical compressed rubber;
4. Sheet rubber 5 mm.

Oil and petrol resistant rubber- high-quality rubber products, designated by the abbreviation MBS. This material is suitable for use in various environments. It is used in any premises, containers and vessels, also in environments with inert gases. Often such rubber is used in the energy sector if the main medium is oil..

Transformer rubber (oil-resistant rubber) is made from nitrile butadiene rubber (SKN-26, SKN-18) in the form of sheets with a thickness of 6 to 12 mm. Oil-resistant rubber is used for sealing covers, bushings, flanges of oil power transformers .

Purpose oil resistant rubber MBS– sealing connections that are not intended to be moving elements. This rubber can also be used as a gasket. Gaskets eliminate the possibility of friction between metal surfaces and withstand single impact loads well.

Sealing gaskets and rings for transformers are made from technical oil and petrol resistant rubber (MBR) by casting into special molds. It is recommended to cut rubber sheets up to 6 mm thick using punch knives.

Oil-resistant rubber for transformers is manufactured in 2 types:

• UM – universal oil-heat-freeze-resistant design
• OM – ozone-freeze-resistant

Nominal geometric parameters of products made of oil-resistant rubber

Technical performance rubber in media
and operating conditions GOST 12855-77

Quality control

The surface of technical rubber must be smooth. The following are not allowed on the main surface and sections of the product: inclusions and gas bubbles of more than 0.5 mm for plates up to 5 mm thick; 0.75 mm – for thicknesses 5-10 mm, 1.0 for thicknesses 10-20 mm; 1.5 mm for plates thicker than 20 mm. The total area of ​​air bubbles should not exceed 10 cm2. per 1 sq.m. products.

Folds formed during the bandaging process of the product should not exceed 4 mm in width, 100 mm in length and be greater than the tolerance range for the thickness of the roll in depth. Acceptable delamination along the edges and ends of the roll or plate is up to 5 mm in length and 1 mm in width.

Physical and mechanical properties

Marking

Each rubber product must be marked with indelible paint. Markings include:

• trademark
• symbol
• date of issue indicating quarter and year
• STK stamp

Transportation and storage

Transformer plates should be stored in closed warehouses at the following temperature conditions:

• from 0 to +25°C – normal storage mode, duration - within the guaranteed storage period
• from +25 to +35°C – no more than 80 days
• from +35 to +40°C – no more than 15 days

If technical plates were stored in subzero temperatures, before use they should be kept for 3 hours at a temperature of 50°C, or for 24 hours at a temperature of 15°C. During storage, rubber products must be protected from direct sunlight, oil, gasoline, kerosene, their vapors, acids, alkalis, gases, as well as other substances capable of destroying rubber.

Transformer rubber sheets can be transported by all types of transport. When transporting in closed containers, the products may not be packaged.
If transformer plates are transported at temperatures below -30°C, the products should be reliably protected from impact loads and deformations. You can unpack technical plates after exposure to negative temperatures only after they have been kept for a day at a temperature from 0°C to +25°C.

NPO "EnergoKomplekt" will also help deliver transformer oil-resistant rubber to any point in Russia, as well as neighboring countries by road or rail.

For any questions you may have, please contact:

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