Knowledge and Formulation of Nitrile Rubber O-Rings

In hydraulic systems and their systems, seals are used to prevent the leakage of working media with external dust and foreign matter. The sealing part, I. E. The sealing part.

Leakage will cause the waste of media, pollution machines and the environment, and even lead to failure of machine equipment, personal accidents.

The leakage of the volumetric efficiency of the hydraulic system can lead to a sharp drop in the working pressure, or even can not work properly.

Small particles of dust entering the system can cause or exacerbate friction and wear of hydraulic components, further leading to leakage.

Therefore, seals and hydraulic equipment seals is an important component. Its reliability and service life, is a measure of hydraulic system, good or bad an important index.

In addition to gap seals, seals are used where it is necessary to control the coupling between the two adjacent surfaces of the gap between the liquid by sealing the minimum gap below.

In contact seals, seals are pressed into self-sealing and self-sealing self-sealing seals (the sealing lip is).

Introduction of Nitrile Rubber O-rings

Nitrile rubber o-rings is a kind of rubber o-ring with a circular cross section, which is called nitrile rubber o-ring because of its o-ring cross section. Yeah, also known as an "O" ring. It first appeared in the mid-19th century, when it was used as a sealing element in steam engine cylinders. Hydraulic and pneumatic transmission system is the most widely used one.

Nitrile rubber o-ring is a circular rubber ring with a circular section. Mainly used for mechanical components in static conditions to prevent liquid and gas medium leakage. In some cases. Nitrile rubber o-ring can also be used as axial reciprocating motion and low-speed Rotary motion dynamic seal components. According to different conditions, different materials can be selected to adapt to it.

The o-ring of NBR should be chosen as large section as possible. With the same clearance. NBR o-ring shall be extruded into the gap in a volume smaller than the maximum allowed for its insertion.

For different types of fixed or dynamic seal applications, the nitrile rubber o-ring provides an efficient and economical seal element for designers. The o-ring is a bi-directional sealing element. The initial compression in the radial or axial direction during installation gives the o-ring its own initial sealing capability. The total sealing force composed of the sealing force and the initial sealing force produced by the system pressure increases with the increase of the system pressure. The o-ring shows a prominent role in static sealing. However, the o-ring is also used in dynamic applications where appropriate, but it is limited by the speed and pressure at the seal.

Has the following advantages:

1) compact structure, easy to assemble and disassemble,

2) both static and dynamic seals can be used,

3) the dynamic frictional resistance is relatively small,

4) single-piece nitrile rubber o-ring can seal in both directions

O-RING specifications and standards

The o-ring has excellent sealing performance and high working life. The working life of dynamic pressure seal is 5 ~ 10 times higher than that of conventional rubber seal products.

The friction resistance of the o-ring is small, and the dynamic and static friction forces are equal. It is 1/21/4 of the friction force of the "0"-shaped rubber ring.

O-ring high wear-resistant, sealing surface wear with automatic elastic compensation function.

Good self-lubricating performance of o-ring. It can be used as oil-free lubrication seal.

The o-ring has the advantages of simple structure and convenient installation.

O-ring working pressure: 0-300MPA; Working Speed: ≤15m/s; Working Temperature:-55-250 °C.

O-ring suitable medium: Hydraulic Oil, gas, water, mud, crude oil, emulsion, water-glycol, acid.

O-ring range

Nitrile rubber o-ring is suitable for all kinds of mechanical equipment, in the specified temperature, pressure, as well as different liquid and gas medium, static or moving state to play a sealing role. In machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, engineering machinery, construction machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery, and various instruments and meters, various types of sealing elements are widely used. Nitrile rubber o-ring is mainly used for static seal and reciprocating seal. When used for Rotary Movement seal, it is limited to low speed rotary seal device. Nitrile rubber o-ring generally installed in the outer circle or internal circle cross-section of the rectangular groove to play a sealing role. Nitrile rubber o-ring in oil, acid, Alkali, grinding, chemical erosion and other environments still play a good seal, damping role. Therefore, the nitrile rubber o-ring is one of the most widely used seals in both hydraulic and pneumatic systems.

High performance nitrile rubber o-ring

Fluorine-containing rubber molecules containing fluorine, according to the fluorine content (I. E. Monomer Structure) and there are various types. The most commonly used fluoro-hexafluoride rubber was first marketed by DuPont as "Viton" . High temperature resistance than silicone rubber, excellent chemical resistance, resistance to most oils and solvents (except ketones and esters) , weather resistance and ozone resistance, cold resistance is poor, the general use temperature range of-20 ~ 250 °C. Special formula can bear low temperature to-40 °C.

The o-ring is a kind of nitrile rubber o-ring whose cross section is circular, so it is called the o-ring because of its cross section is o-ring. Rubber nitrile rubber o-ring is one of the most widely used seals in hydraulic and pneumatic transmission systems

The general nitrile rubber o-ring is less used in rotary motion seals. Nitrile rubber o-ring generally installed in the outer circle or internal circle cross-section of the rectangular groove to play a sealing role.

Fluororubber is an organic elastomer made by the copolymerization of fluorinated monomer. Its characteristics can be as high as 300 °C, acid and alkali resistance, oil resistance is the best in oil-resistant rubber, radiation resistance, high vacuum resistance, electrical insulation, mechanical properties, chemical corrosion resistance, Ozone Resistance, resistance to atmospheric aging are excellent. The disadvantage is poor processing, expensive cold resistance, low elastic permeability.

Temperature range:-40 °C ~ + 300 °C. With the development of industry, the fluorine rubber o-ring is widely used in automobiles, electronics, aerospace, ships and so on, which requires high precision, high temperature resistance, high wear resistance and harsh working conditions. With the development of industry, the fluorine rubber material is constantly improving and innovating, the following is the widely used fluororubber material properties and scope of application.

ADVANTAGES: Resistance to heat up to 250 °C and resistance to most oils and solvents, especially all acids, aliphatic hydrocarbons, aromatic hydrocarbons, animal and vegetable oils. Good chemical stability, excellent high temperature resistance, good aging resistance, excellent vacuum performance, excellent mechanical performance, good insulation performance, excellent vacuum performance, good mechanical performance, good insulation performance

DISADVANTAGES: not recommended for use in Ketones, esters with low molecular weight and mixtures containing nitrate. Motor vehicles, locomotives, diesel engines and fuel systems.

O-ring products are mainly made of materials

NBR: This material can reach the highest temperature of 130 degrees, hardness of 50-90 degrees have, complete specifications, it has good mechanical properties, mineral-based lubricants and Grease.

Fluoro rubber: This material temperature can reach 240 degrees of high temperature, complete specifications, it is known for high temperature and chemical resistance and other good performance. In addition, it also has good anti-aging and anti-oxidation, very low gas permeability (especially suitable for high altitude equipment) .

EPDM RUBBER: temperature ranges from-50 °C to 150 °C. They are resistant to hot water, steam, ageing and chemicals. It is suitable for hot water, steam, detergents, potassium hydroxide solutions, silicone oils and fats, a variety of dilute acids and chemicals. Its glycol-resistant brake fluid properties are particularly recommended, but it is not suitable for all mineral oil products (lubricants, fuels) .

Silicone rubber: Silicone Rubber has the widest working temperature range (- 60-180℃) , harmless, non-toxic and tasteless, excellent resistance to ozone aging, oxygen aging, light aging and weathering, excellent electrical insulation properties, special surface properties and physiological inertia, high permeability.