NBR rubber is a rubber compound that stands out from other rubbers by the fact that with the increasing share of ACN, its resistance to oils, fuels and fats increases. On the other hand, its resistance to low air temperatures decreases. If NBR and PVC are mixed in the production process, an ozone-resistant mixture can be obtained. When combined with a phenolic resin, a rubber is elastic in stretching and resistant to hot water.
What does NBR stand for?
NBR, or rivet, is one of the most popular rubbers. It is often referred to as oil-resistant rubber. Other names of this rubber that can be found on the market are:
- acrylonitrile-butadiene rubber,
- acrylonitrile – butadiene rubber,
- from English: nitril butadiene rubber.
NBR is a rubber of the type of elastomers, i.e. a product of copolymerization of butadiene and acrylonitrile.
From a chemical point of view, it is a copolymer of butadiene and acrylonitrile.
NBR rubber: properties of oil resistant rubber
Depending on the amounts of the above chemical compounds used and the change in their percentage in the mixture, the resistance to oils and low temperature can be freely manipulated. The temperature parameters at which you can work with this rubber range between -30 degrees Celsius and 100 degrees Celsius. The physical properties of rubber are resistance to engine, heating and transformer oils. Rubber is also characterized by high durability to the use of lubricants, hydraulic fluids and aliphatic hydrocarbons. It will respond well to work in conditions with the use of propane, butane, gasoline. It is also praised for its durability in the presence of alcohols, aqueous salt solutions and dilute acids and bases at medium temperatures. As for the water temperature, it will work well in conditions up to 60 degrees Celsius. However, NBR is not very resistant to oils and greases containing silicone, brake fluids based on glycol and HFD hydraulic fluids. Rubber will also not be resistant to concentrated acids, lyes and aromatic hydrocarbons. It will also be problematic to use chlorinated hydrocarbons in its presence, for example benzene. Esters can also damage the structure of NBR.
The exact properties of rubber are as follows:
- it has low resistance to weather conditions and ozone – the exception is its mixture with PVC,
- it is very resistant to breaking,
- according to various sources, the thermal resistance ranges from -50 to 105 degrees Celsius,
- it is resistant to oils and gasoline,
- resistant to aliphatic hydrocarbons,
- also characterized by durability against light heating oils, fuels for diesel engines,
- high resistance to non-flammable hydraulic fluids (HSA, HSB: oil-water emulsions, HSC: polyglycol-water mixtures),
- does not react with acids and bases diluted at not too high temperatures,
- not stable against aromatic and chlorinated hydrocarbons,
- not resistant to HSD: polyester and chlorinated hydrocarbons),
- no resistance to brake fluids containing glycols.
NBR rubber – Temperature range
The following temperature range is provided for the NBR rubber compound, most commonly used in O-rings, known to us as O-rings or O-rings:
-50, up to +105, although POWER Rubber Experts recommend using in the range from -40 ° C to + 90 ° C
XNBR is a reinforced NBR compound.
It owes its abbreviation to the name containing X: Carboxylated Nitrile (source: www.skf.com) which in Polish means: Nitrile carboxylation – Carboxylic Nitrile.
This mixture is more resistant than the basic nitrile rubber, it has:
- most of the abrasion resistance
- greater tear resistance
XNBR blend is used in a wide high-tech industry. Polish conditions are not yet ready to use this mixture.
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Acrylonitrile-butadiene rubber – Application
Rivet is used mainly in hydraulics and pneumatics. This rubber will form all seals, O-rings and o-rings. Work in which there is high pressure, strong pressure, compression and the accompanying substances are oils is a suitable environment for the use of this rubber. From everyday life, NBR can be found in tires, tubes, bumpers. The cushioning elements are also made of NBR. Their advantage is also that they dampen vibrations. All hoses for liquid fuels and oils are also manufactured using NBR. Interestingly, the linings and printing rollers are also made of this rubber. In the food industry, NBR can be used as a material for transmission hoses. It can also be used as a sealant for various types of joints.
Plates that are subjected to NBR vulcanization can be used as washers and gaskets. Each use of mineral oil in their presence will not damage them. The industries involved in the production of components for the automotive, chemical, machinery and petrochemical industries have significantly optimized their production thanks to the use of NBR.
The enormous properties of NBR mean that also in laboratories you can come across items made specifically of nitrile. For example, the NBR gloves are 3 times more puncture resistant than natural rubber gloves.
Na rynku spotkać można też buty i kleje, które zwierać będą NBR.
A better mixture with higher properties is a Viton mixture. Welcome to the articles: Guma Viton
Rubber products made of NBR rubber: