Low-temperature Resistance HNBR
Hot-polymerised NBR rubber is polymerised in a temperature range of 30°C to 40°C. This process forms highly branched polymers. This structure provides good adhesion and strong bonding in adhesive applications. Physically entangled branched polymers also feature significantly improved tensile strength at higher temperatures.
- Product Introduction
Crestmat is a leading rubber material and rubber product supplier in China. The factory has been devoted in special rubber compounding for more than 30 years. The products mainly include rubber materials like fluorosilicone (FVMQ), arylate rubber (ACM), Hydrogenated Nitrile (HNBR), fluoroelastomer (FKM) and rubber calendering products such as HNBR sheet, FKM sheet, fluorosilicone sheet and rubber extruded products such as fkm o ring cord, HNBR rubber cord, fkm profile and high quality ffkm oring. The products are widely used in aviation, automobile, petroleum, marine, semi-condutor and many other fields. The rubber compounding factory is well equiped with Japan-made banburies, two-roller mixers, reaction kettle, strainer; the rubber product factory is equiped with Rotocure machine, press machine, extruder. The lab is equiped with Rheometer, Hardness Testor, Elongation Testor, Rotary Viscosimeter, Biochemitry Incubator.
Why Choose Us
Advanced Equipment
The rubber compounding factory is well equiped with Japan-made banburies, two-roller mixers, reaction kettle, strainer; the rubber product factory is equiped with Rotocure machine, press machine, extruder.
Professional Team
FKM material is equiped with 3 production lines, one for precompounds, one for black compounds, one for colorful compounds. The maximum capacity for fluoroelastomer compound and polymer is 4800 tons per year.
Customized services
The rubber compounding factory is well equiped with Japan-made banburies, two-roller mixers, reaction kettle, strainer; the rubber product factory is equiped with Rotocure machine, press machine, extruder. The lab is equiped with Rheometer, Hardness Testor, Elongation Testor, Rotary Viscosimeter, Biochemitry Incubator.
High Quality
In our Reaserch and Development Certer, we have a leading laboratory equiped with a full sets of testing machinary. Here we can develop the new formulations and also test the rheological properties and physical properties for each batch of orders.
► Excellent oil and fuel resistance
► Great wear resistance
► Good heat and cold resistance
Low-temperature Resistance HNBR
► Excellent oil and fuel resistance
► Great wear resistance
► Good heat and cold resistance
► Outstanding o-zong resistance
► Excellent dynamic performance
What is Low-temperature Resistance HNBR?
Low-temperature resistance HNBR is a special class of nitrile rubber – NBR rubber - that has been hydrogenated to increase the saturation of the butadiene segment in the carbon polymer backbone.
This results in better material properties that include greater thermal stability, broader chemical resistance and better tensile strength.
Nevertheless, HNBR is still a type of hydrocarbon rubber. It should not be expected to provide the same chemical resistance or thermal stability as fluorine rubbers.
Hih temperature resistance: HNBR can withstand continuous temperatures of up to 150°C (302°F).
Oil and fuel resistance: HNBR is resistant to a wide range of oils and fuels, including aliphatic hydrocarbons, aromatic hydrocarbons, and synthetic fluids.
Good mechanical properties: HNBR has good tensile strength, tear strength, and abrasion resistance.
Ozone resistance: HNBR is resistant to ozone attack.
Good low temperature flexibility: HNBR has good low temperature flexibility, down to -40°C (-40°F).
Type of Low-temperature ResistanceHNBR
Cold-polymerised NBR
The current generation of cold NBR includes a wide range of compositions. Acrylonitrile content ranges from 15% to 51%. Mooney values range from very hard (110) to flowing liquids - with 20-25 as the lowest practical limit for solid material.
They are produced using a wide range of emulsifier systems, coagulants, stabilisers, molecular weight modifiers and chemical compositions. Third monomers are added to the polymer backbone to provide advanced performance.
Hot-polymerised NBR
Hot-polymerised NBR rubber is polymerised in a temperature range of 30°C to 40°C. This process forms highly branched polymers. This structure provides good adhesion and strong bonding in adhesive applications. Physically entangled branched polymers also feature significantly improved tensile strength at higher temperatures.
Cross-linked hot-polymerised NBR
Cross-linked hot NBR rubber is characterised by branched polymers that are further cross-linked by the addition of a bifunctional monomer. These products are typically used in moulded parts to provide sufficient moulding force or back pressure to eliminate trapped air.
Carboxylated nitrile - XNBR rubber
XNBR rubber is created by adding carboxylic acid groups to the NBR polymer backbone, significantly altering its processing and curing properties. The result is a polymer matrix with significantly increased strength (measured by improved tensile, tear, modelling and abrasion resistance).
Hydrogenated nitrile – low-temperature resistance HNBR
Hydrogenated butadiene nitrile rubber is produced by hydrogenating NBR. This results in the removal of olefin groups, which are susceptible to degradation by various chemicals as well as ozone. The hydrogenation degree also determines the type of vulcanisation that can be applied to the polymer.
What is the difference between NBR and HNBR?
Nitrile vs HNBR: Chemical Resistance
Chemical resistance is a critical parameter in various sealing applications. As we all know, Nitrile is mainly known for its excellent resistance to a wide range of chemicals. The saturation of the polymer backbone is responsible for this excellent chemical resistance. Therefore, Nitrile is not easily attacked by a wide range of chemicals.
Nitrile vs HNBR: Tensile Strength
Tensile strength is a material property that determines how much a material resists pulling when stretched under force. The molecular structure of Nitrile enhances its tensile strength. Therefore, Nitrile is very suitable for sealing and gasketing applications in a wide range of occasions. NBR has a lower tensile strength compared to HNBR. The tensile strength ranges from 200 - 3,500 PSI.
Nitrile vs Hydrogenated Nitrile: Wear Resistance
During contact with other surfaces, materials can lose parts due to friction or rubbing. Technically, the ability to withstand such losses is the wear resistance of the material. Wear resistance, on the other hand, is closely related to abrasion resistance. It focuses on the ability of the material to resist wear from abrasive particles.
Nitrile vs Hydrogenated Nitrile: Cost
Cost is another key factor to consider, depending on your investment. Nitrile is generally known for its cost-effectiveness. As a result, it is often found in a variety of industries with tight budgets. For applications that do not require enhanced properties, Nitrile is an attractive option.
Application of Low-temperature Resistance HNBR
Belts and hoses
Automotive synchronous toothed belts initially used NBR, but due to its poor dynamic performance and ozone resistance, the product life was very short. Neoprene was used to replace NBR, and the ozone resistance was improved. HNBR has better heat resistance than CR, and the operating temperature can be increased by about 30°C. In addition to its high strength, high wear resistance, and ozone resistance, HNBR is the most ideal rubber material for synchronous toothed belts because its dynamic elasticity changes little with temperature and can maintain accurate power transmission within a large temperature range. Major automobile companies in Japan, Europe and the United States use HNBR to produce synchronous toothed belts.
HNBR has excellent corrosion resistance to fuel oil, so it is widely used in automotive fuel hoses. Since mineral oil-based advanced lubricants contain various additives such as detergent dispersants, antioxidants, anti-wear agents, and extreme pressure agents, these additives accelerate the aging of rubber materials. HNBR has better resistance to lubricant additives than other rubbers (NBR, acrylic rubber, fluororubber). HNBR is mainly used to produce fuel pipes, oil cooler oil supply hoses and other products that come into contact with fuel oil and other oils.
Gaskets, liners, O-rings
In recent years, the drilling of oil and gas wells has become deeper and deeper, the temperature is higher, and the working environment is more severe. Fluororubber seals are easily damaged in such an environment. The media that have the greatest impact on rubber performance under high temperature and high pressure are H2S, CO2, methane, diesel, amine corrosion inhibitors, steam and acids, and HNBR has excellent tolerance to the above chemical media, and is particularly suitable for the production of rubber parts such as riot guards, drill pipe shields, embolic plugs, valve seals, pump pistons, power cable sheaths, and rotary hoses for oil and gas wells. HNBR has better radiation resistance than silicone rubber, fluororubber, and polytetrafluoroethylene, and is also suitable for various rubber seals in nuclear power plants.
Roller
HNBR has good chemical resistance and heat resistance, and is suitable for making various industrial rubber rollers, especially ZSC, which has excellent oil resistance and wear resistance. Even if the hardness of ZSC exceeds 90 degrees, its processing viscosity is very low and easy to form. It has greatly improved strength, water resistance, and oil resistance compared to polyurethane rubber. It is suitable for use as a high-hardness rubber roller material, such as printing rubber rollers, industrial rubber rollers, etc.
Characteristics of Low-temperature Resistance HNBR
External Effect Resistance: HNBR easily resists external factors like heat and oxidation. In fact, you'll find that its ability to withstand heat and oxidation is more than that of nitrile rubber itself. The material doesn't lose its performance when it comes in contact with higher temperatures, and this improves its functionality significantly.
Chemical Resistance: You can count on this material to also keep any chemicals at bay. They have zero effect on it, and this makes the material perfect in situations where you need to protect internal base items from any chemicals.
Flexibility In Cold: We already spoke about how HNBR doesn't fold when it comes in contact with heat. Well, the exact same benefit can be felt when you place it in cold environments. So, it really doesn't matter what environment you put it in – as long as you need it to maintain its properties, HNBR will stay.
Strength: You can also count on the material to stay strong and withstand significant levels of abrasion. If you need long-term physical performance and durability, HNBR is perfect for you.
Stretchability: Just as you get with the NBR material, HNBR is quite flexible. Stretch it, and it'll come right back. .
Ability To Seal: Since it repels any external forces or materials, HNBR does well when it needs to act as a seal. To make things better, the material creates a seal across different temperatures and pressure ratings.
Resistance To Weather: Natural elements like weathering and exposure to ultraviolet light have little to no effect on HNBR. so, if you need a rubber material for something that's outdoors, you can count on it to be of significant help to you.
Susceptibility To Compounding: Remember that you can still further compound HNBR with other additives to improve some of its physical and chemical properties. So, there are avenues for further development.
How Low-temperature Resistance Is Made
The Principle Of Polymerization
Central to the creation of HNBR is copolymerization- a process where you take two monomers and combine them. In this case, we have butadiene and acrylonitrile (ACN). So, how is the process done?
Preparing Your Mixture
Now that you have the monomers, you group them with different catalysts and additives and catalysts in a simple rubber mixing vessel. As polymerization occurs, you want to make sure that you have a proper view of things like the pressure and ambient temperature.
Polymerizing Using A Reactor
For this process to work, you need to take the mixture and put it in a reactor. In most cases, you have to control the pressure and temperature settings as you begin polymerization. This way, the monomers can be combined, and you can form the necessary polymer chains.
Adding Hydrogen To The Mix
Once the polymerization process is complete, you can go ahead to hydrogenate the NBR polymer. Essentially, you add hydrogen gas to what you have under high temperature and pressure.
Filtering The Excess Hydrogen
In some cases, it might be necessary to remove any excess hydrogen from the mix. Once the desired effect of adding hydrogen has been achieved, there really isn't a reason for you to leave any extras.
The market drivers for the Hydrogenated Nitrile Butadiene Rubber (HNBR) Market can be influenced by various factors. These may include:
Automobile Industry Demand: Because of its superior resistance to heat, oil, and abrasion, HNBR is widely utilized in the automobile industry for applications like as seals, gaskets, hoses, and O-rings. The need for HNBR is driven by strict pollution standards and the world's expanding vehicle demand.
Growing Industrial Applications: Owing to its characteristics, HNBR can be used in a wide range of industrial settings, including chemical processing, oil and gas extraction, manufacturing, and aerospace. The HNBR market is growing as a result of the growing industrial sector, particularly in emerging markets.
Performance Benefits: When compared to other elastomers, HNBR has better performance qualities, such as high temperature resistance, higher mechanical qualities, and strong resistance to fuels and chemicals. Its adoption is fueled by these benefits in a variety of industries where these qualities are crucial.
Technological Innovations: Continuous R&D projects to improve HNBR's characteristics and functionality support the market's expansion. Advancements in manufacturing procedures, such better hydrogenation methods, result in higher grades of HNBR with better qualities, broadening the range of applications for this material.
Environmental rules: The demand for HNBR, which is renowned for its durability and recyclability, is driven by rules encouraging the use of eco-friendly materials and an increasing emphasis on environmental sustainability. HNBR is desirable in applications where environmental considerations are crucial because of its resistance to biofuels and alternative fuels.
Growth of the Energy Sector: Because HNBR can endure rigorous working conditions, it is a crucial component used in drilling equipment, packers, seals, and other equipment related to oil and gas exploration and production. The need for HNBR is fueled by the energy sector's expansion, notably in offshore drilling and unconventional oil and gas exploitation.
Appliances and Consumer Electronics: Due to its unique qualities, HNBR can be used in appliances and consumer electronics in areas including HVAC systems, kitchen appliances, and electronic device seals and gaskets. The demand for HNBR in this market is driven by the rising demand for household appliances and electronic devices.
Our Factory
Crestmat is a leading high performance rubber material and rubber product supplier in China. The factory has been devoted in special rubber compounding for more than 30 years.
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