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Nitrile rubber is currently one of the more commonly used O-ring seals, but many people do not know much about its properties. This article mainly takes everyone to understand some of the main properties of nitrile rubber O-rings. Nitrile rubber, referred to as NBR, is mainly produced by low-temperature emulsion polymerization. It is a synthetic rubber produced by copolymerizing butadiene and acrylonitrile. It has good oil resistance, so O-rings with high oil resistance requirements are generally The use of nitrile rubber has higher abrasion resistance, better heat resistance and strong adhesion. Its disadvantages are poor low temperature resistance, poor ozone resistance, poor insulation performance, and slightly lower elasticity. There are five types of acrylonitrile content (%) in the nitrile rubber: 42-46, 36-41, 31-35, 25-30, and 18-24. The more acrylonitrile content,
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O-rings are widely used in various mechanical equipment seals. They provide a seal under static or moving conditions at specified temperatures, pressures, and different liquid and gas media. They also have high and low temperature resistance. Haisheng Rubber tells you that you must control the temperature range, maintain good sealing elasticity, and be resistant to ozone and weathering when using rubber seals. Secondly, the silicone sealing ring in the rubber sealing ring material has many excellent characteristics such as non-toxic and odorless, waterproof, flame retardant, high temperature resistance, abrasion resistance and oil resistance. It can be used for making thermal insulation, insulation products and medical silicone products. Pieces. So, what are the factors that cause the aging of O-type rubber seals?
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Haisheng rubber takes you to know the points to pay attention to when selecting the seal ring material
The role of the seal ring is mainly to seal, and there are many mediums to seal, mainly oil. It plays the role of dust and oil isolation in the application. The performance of the seal ring directly affects the performance of other equipment. Good or bad, and the material that determines the performance of the seal ring is first of all. So how to choose the material of the seal ring? What factors are related to it, today Haisheng Rubber will give you a detailed introduction. 1. Mechanical movement speed. The adaptability of the material of the seal to the speed of the machine is different. Some common materials cannot adapt to high-speed mechanical operation. Therefore, when selecting the material of the seal, choose a high-end one so that high-speed operation can be used. . 2. Stress. The material of the seal ring is also very sensitive to the pressure of the work. Different materials, the pressure they can withstand
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During the production process, silicone products are found to be brittle and very easy to break, which seriously affects production, and brittle silicone products do not meet the requirements in terms of service life. So, what are the reasons for the brittleness of the silicone products? First, the structure or mold design of the silicone products causes the product to easily break. The product structure or mold design is unreasonable, which will cause the silicone products to be easily broken during molding. Solution: Modify the structure of the product or mold to achieve improvements, such as slightly thickening the excessively thin areas, slightly rounded corners, etc . Second, the molding temperature is too high or the vulcanization time is too long, resulting in brittle silicone products. Solution: reduce the temperature to control the curing time. 3. Poor ventilation or high temperature caused by secondary sulfur addition results in brittle silicone products. Solution: pay attention to adjusting the ventilation and control of secondary sulfurization
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The seal without relative displacement of the two sealing surfaces during operation is a static seal. The sealing of the head and barrel of the pressure vessel, the seal of the reducer case and the cover, and the seal of the cylinder and the cylinder head of the internal combustion engine are all static seals. 1. O-ring seal O-ring seal has a long life, compact structure, easy assembly and disassembly, and good sealing performance. Depending on the material, it can be used in the temperature range of -100 ℃ ~ 260 ℃ and its pressure of 100MPa. If you want to work under higher or lower temperature and pressure conditions, you need to choose the material to make it and use a metal hollow O-ring seal. He can work under 280MPa pressure and the temperature range is -250 ℃ ~ 650 ℃. 2. Gasket seal Gasket seal is the most commonly used form of static sealing. A gasket of different materials is placed between the sealing surfaces of the two connectors.
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With the continuous development and progress of the social age, O-rings and gaskets in today's society are widely used in industry and life, but what kind of tightness may we tangled in the end? Haisheng Rubber takes everyone to understand their similarities and differences. O-rings are the same as gaskets: both meet this implicit condition: when the sealing contact pressure is greater than the pressure of the sealed medium, the sealing effect is maintained; when the sealing contact pressure is less than the pressure of the sealed medium, the gasket or O-shape The ring was ejected and the medium leaked a lot. O-rings differ from gaskets: flat gasket seals consist of gaskets, flanges and bolts, forming a complex statically indeterminate system; seal contact pressure is provided by the deformation of the bolts. The contact pressure distribution when the flat gasket is working is uniform. When the medium pressure fluctuates, and the contact pressure is greater than the contact pressure, the leakage may occur.
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Advantages of fluorine rubber seals: 1. The seals should have outstanding sealing function under the operating pressure and a certain temperature range, and can actively improve the sealing function with the addition of pressure. 2. The friction between the seal equipment and the moving parts should be small, and the friction coefficient should be stable. 3. The seal ring has strong anti-corrosion ability, not easy to age, long operating life, good abrasion resistance, and can be actively compensated to a certain extent after wear. 4. The structure of the fluorine rubber seal ring is simple, the use and protection of the fluorine rubber are convenient, and the fluorine rubber seal ring has good corrosion resistance, so that the seal ring has a longer life. Fluorinated rubber is a synthetic rubber rich in fluorine atoms. Fluorinated rubber has excellent functions of high temperature resistance, oil resistance and corrosion resistance to a variety of chemicals.
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When the perfluoro O-ring is installed, in order to reduce the wear and tear of the perfluoro O-ring, we can use grease and other methods to reduce wear and tear, and pay attention to the tensile strength during installation. Anti-deformation, etc. So, what should we pay attention to when installing perfluoro O-rings? (1) Lubricating elastomer seal installation can reduce wear and seizure by using lubricating grease. Generally speaking, a thin lubricating film is necessary for the installation of O-rings, because perfluoro seals are used in harsh conditions, and the lubricating oil can improve the seal's ability to withstand high temperature carbonization and cracking. In most cases, a sealed medium is used as the lubricant, fluorinated oil, such as Krytox or powdered graphite can also be used as the lubricant. Even if lubricant is used, the seal has been installed.
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The rubber waterproof sealing ring plays a waterproof role, because the waterproof ring is made of rubber elastomer material, so the full name is also called rubber waterproof ring. The size, material, hardness, tolerance and other parameters of the waterproof ring must be provided when purchasing the waterproof ring. The burr of the clamping line must not exceed 0.05MM (the minimum tolerance of Haisheng Rubber can be 0.01mm) during the appearance inspection. To its own effect. The waterproof ring can be divided into silicone waterproof ring, silicone rubber waterproof ring, watch waterproof ring, conductive waterproof ring, thermal conductive waterproof ring, LED waterproof ring according to different uses and materials. The rubber seal is used to seal the required finished product to prevent oil leakage, liquid leakage, etc., and it is also dustproof. Rubber seals are widely used in mechanical equipment, electronic and electrical products. They are an indispensable rubber seal accessory, which protects
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The specific use of automobile gaskets is actually very extensive, and the use of this product must be essential in the automotive sealing effect. Next, Haisheng Rubber will show you the common uses of gaskets. The most common use of gaskets is as part of a sealing system, where one of the main functions of a gasket is to form a seal between two other surfaces. (For example, when laying pipes, pipe gaskets are used to form a seal between two pipes). The exact function of the gasket in this respect is to prevent the escape or intrusion of the fluid (liquid or gas) even under extreme pressures and temperatures. However, the function of the gasket is not only to provide a seal to prevent liquid or gas from escaping, but also an important safety device. In this regard, sealed
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Silicone products are used in construction machinery, automobiles, electronics, household appliances, toys, medical, sports equipment and other industries. 1. Silicone products are indispensable components for making photocopiers, keyboards, electronic dictionaries, remote controls, toys, silicone keys, etc. 2. Silicone products can be used for durable shaped gaskets, packaging materials for electronic parts, and maintenance materials for automotive electronic parts. 3. Silicone products can be used to make electronic components and mould high pressure points. 4. Silicone products can be used to make conductive silica gel, medical silica gel, foam silica gel, mold silica gel, etc. 5. Silicone products are used in the construction and repair of houses, seam sealing at high speeds and kilometers, and bridge sealing. 6
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Can we seal silicone liquids with silicone rubber seals? Does alcohol corrode silicone rubber seals? Silicone rubber seals are used to seal alcohol, and they do not react with each other. Silicone rubber seals were introduced as a highly active adsorbent. Silica gel is a highly active adsorption material, usually containing sodium silicate and sulfuric acid. It is made through a series of post-treatment processes such as aging and acid foam. Silica gel is an amorphous substance, insoluble in water and any solvents, non-toxic and tasteless, chemically stable, and does not react with any substance other than strong bases and hydrofluoric acid. Alcohol is a colorless, transparent, volatile, flammable and non-conductive liquid. When the alcohol concentration is 70%, it has a strong killing effect on bacteria. Therefore, for some medical FDA-approved silicone rubber seals, alcohol or physiological salts are generally used at high temperatures.
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Fluoro rubber sealing ring is a sealing ring made of fluoro rubber, that is, a sealing ring made of a copolymer of vinyl fluoride and hexafluoropropylene. The role of the fluorine rubber seal ring is similar to that of other seal rings. It is a ring composed of one or several parts. It is a ring fixed on the bearing or a washer in contact with another ring. This kind of labyrinth gap can prevent the leakage of lubricating oil or prevent the intrusion of debris. Its elastomer is a copolymer of vinyl fluoride and hexafluoropropylene. Their molecular structure and fluorine content are different, and the chemical properties and low temperature resistance of the elastomer are also different. Its elastomer has good flame resistance, air tightness, high temperature resistance, ozone resistance, weather resistance, and oxygen resistance
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Silicone O-rings are generally based on silicone raw materials, and corresponding formulas are added to meet the requirements of the working conditions to meet the required performance requirements. Next, Dongshengdi will take you to understand some basic knowledge of silicone O-rings. Features of silicone O-rings 1. Good electrical insulation, colorless and tasteless; 2. Good processing performance; 3. Good temperature resistance (minus 60 degrees, and high temperature resistance up to 230 degrees); 4, silicone O-rings Meet ROHS and other environmental protection requirements, pass FDA certification; 5, good appearance, can be adjusted to a variety of colors; 6, silicone O-ring seals have high resistivity, its resistance can remain stable over a wide temperature and frequency range. At the same time, it has good resistance to high voltage corona discharge and arc discharge. 7. Silicone O-ring has a long service life, high softness, non-slip, and shockproof.
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Different equipment has different requirements for the performance of rubber seals. When designing and using rubber seals, they should be analyzed and determined according to the specific situation. The requirements for the main performance of the seal ring are as follows: 1. Allowable leakage. An important requirement in the design of rubber seals is the amount of leakage, which is determined by the purpose of the seal. The allowable leak rate to ensure the normal operation of machinery and equipment is called the allowable leak rate. The allowable leak rate is generally determined according to the specific conditions of the equipment. There is no uniform standard. 2. Friction. Friction can cause heat generation and wear of rubber seals, and even damage the sealing surface of parts, which is the main cause of seal failure and leakage. The friction of a contact seal depends mainly on the friction coefficient of the material and the lubrication conditions. 3. Wear. Friction will cause wear, which will inevitably reduce the performance of rubber seals
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Rubber seals are sealing products with good elasticity. Small stresses in different media will cause large deformations. This deformation can provide contact pressure, compensate for leakage gaps, and achieve the purpose of sealing. In the process of using rubber seals, aging and failure often occur. Except under the condition that the working conditions cannot be changed during use, it is necessary to strengthen the anti-aging performance in the production design of rubber seals. The aging phenomenon such as cracking, hardening, stickiness, chalking, and reduction in tear strength caused by repeated deformation of rubber seals is called fatigue aging. Not only rubber seals, but also many fatigue aging in the actual use of rubber products, such as mobile phone accessories, shock-proof rubber products and so on. Therefore, when designing rubber seals with excellent fatigue aging resistance,
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The aging of rubber seals is usually caused by the combination of three factors: mechanical force, oxidation and ozonation. Under normal circumstances, aging will make the rubber seal ring brittle, accelerate fatigue crack growth, reduce the critical fracture energy, and reduce its life. The aging process of rubber seals mainly includes the following aspects: 1. Mechanical cracking reaction occurs under the action of mechanical force. Due to the viscosity of the polymer, the relaxation process of the rubber in the deformation cycle is too late to complete, and then Entering the next deformation cycle, this will cause the residual stress in the internal deformation of the rubber seal to continue to increase. When the stress gradient is large, it will cause the rubber molecular chain to break directly and generate free radicals, and then under the action of oxygen, the free radical oxidation chain reaction of the rubber will be initiated and aged. 2, mechanical force activated oxidation cracking reaction rubber seal
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Today's technology, many products' sealing protection technology still has certain defects in the actual process, such as waterproof seals for mobile phones, waterproof seals for automotive lamps, etc., and the seal material is made of silicone (a kind of rubber material). We are the most common one, so as a type of seal used in many aspects, in the normal use process, some unexpected functional problems often fail to meet the actual problems, and the product's effect cannot be demonstrated. Today Haisheng Rubber brought you to understand what are the considerable factors affecting it? 1) The impact of hardness and softness In many cases, the functionality and structure of the product can be completely changed according to the different softness of the silicone product. Therefore, during the use of the silicone seal ring, due to the selection of different hardness and softness, it is subjected to stress, stretching, and extrusion. Out of pressure
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Everyone knows that FKM sealing material refers to fluoroelastomer. So what does FFKM mean? What does it mean to have an F? Haisheng Rubber tells you that FFKM is perfluoroether rubber, which is the main material of seal rings or rubber products made of perfluoro seal rubber. It is a sealing material that is much higher than ordinary FKM fluorine rubber in terms of material application and price. It can be said that it is not a grade of product texture. The material of the perfluoro rubber seal ring is resistant to high temperature environments and corrosion-resistant occasions (can be resistant to More than 1600 kinds of chemical corrosion) is very excellent. The material of FFKM perfluoroether rubber seal ring is composed of TFE (main chain), PMVE (branch chain) and bridging part. It not only has excellent high temperature resistance and chemical resistance like PTFE, but also has rubber
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There are more and more places where rubber products are used in our lives. In fact, it is also divided into solid rubber and sponge rubber. They are also made in different ways. Compared with solid rubber, sponge rubber has many special and valuable properties due to its structural specificity, that is, its porosity, such as: ⑴, low apparent density, light weight, and low cost; ⑵, rich in elasticity and softness It has excellent sealing effects such as dust resistance, waterproof gas, etc .; ⑶, improves the heat insulation performance, has a lower thermal conductivity; ⑷, improves the ability to absorb impact loads, and has excellent cushioning and damping performance; ⑸, improves sound insulation , Sound absorption effect; 效果, improve touch, improve comfort; ⑺, a wide range of physical properties, changing the apparent density or cell structure can get the corresponding performance of sponge rubber. Therefore, sponge rubber products are widely used in sealing, shock absorption, and heat insulation.
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