What is Nitrile rubber? – Properties, Applications, Uses

Nitrile rubber

Nitrile  Rubber:- Nitrile is a synthetic rubber that is also known as Buna-N or NBR. It is a copolymer made of acrylonitrile and butadiene molecules fused together. Nitrile rubber isn’t toxic.

While acrylonitrile is a form of cyanide, when dissolved in water, it does not break up into ions giving the type of cyanide used as poison its lethal properties.

Nitrile rubber

Rather than breaking up, the material’s molecules dissolve. Nitrile is created by emulsifying butadiene and acrylonitrile in water and then polymerizing the resulting material, which turns the single unit molecules into larger molecules with multiple units.

Depending on the characteristics the manufacturer needs the rubber to have, the final product will contain anything from 15 to 50 percent of acrylonitrile.

TYPES OF NITRILE RUBBER

1. HYDROGENATED NITRILE BUTADIENE RUBBER

The selective hydrogenation of acrylonitrile-butadiene rubber produces hydrogenated NBR elastomer. The double bonds in NBR are separated during this process, making the polymer more resistant to oxygen and improving its heat resistance.

In addition to enhanced wear resistance in complex applications and increased aging resistance, hydrogenated NBR outperforms NBR. In terms of physical properties, HNBR is resistant to hot water and steam and has good high and low-temperature efficiency.

These blends also have good media and abrasion resistance.

2. CARBOXYLATED NITRILE BUTADIENE RUBBER

Carboxylated nitrile butadiene rubber is a type of nitrile polymer that has been used to improve tear and abrasion resistance. As a result, XNBR based materials are often used in complex applications including rod seals and rod wipers.

Carboxylated nitrile butadiene rubber is an alternative to NBR. Butadiene, acrylonitrile, and acrylic acid form the terpolymer XNBR. Carboxylic acid groups are introduced by the presence of acrylic acid.

The addition of zinc additives to these groups allows for crosslinking. Carboxyl groups are present at a concentration of 10% or less. Standard sulfur vulcanization is used in addition to these ionic crosslinks.

PROPERTIES OF NITRILE RUBBER 

Oil resistance is the most common feature of nitrile rubber but it is also durable and temperature resistant. The proportion of acrylonitrile in nitrile rubber determines the amount of oil resistance.

More acrylonitrile makes the rubber less permeable to gases, more resistant to swelling from oil, and stronger at lower temperatures, less acrylonitrile makes it more flexible.

In general, nitrile rubber can withstand temperatures ranging from -40°F to 226°F. It’s three times as resistant to punctures as natural rubber, as well as wounds, abrasion, tears, caustics, and aliphatic hydrocarbons.

It is less adaptable. Fluoroelastomers are more expensive than nitrile. A type of rubber known as hydrogenated nitrile can withstand heat and oxidation while remaining flexible.

APPLICATIONS OF NITRILE RUBBER

Nitrile rubber is commonly used in applications that require oil resistance, extreme temperature efficiency, and personal safety. Its resistance to hot oil makes it a popular choice for gaskets, oil seals, and other parts in the automotive industry.

It is also used to produce ink spreading rolls Nitrile is used in self-sealing fuel tanks and bladders in aerospace because of its wide temperature range.

It is also used to waterproof fabric and increase the finish in textiles. Because of their durability and hypoallergenic properties, nitrile protective gloves are probably their most well-known use.

Nitrile gloves vary in thickness from heavy-duty gloves used in nuclear applications to thinner disposable gloves used in medical, laboratory, and cleaning.

However, nitrile can be found in a variety of molded products, including shoes, floor mats, sponges, and a variety of other items.

Know More:- Difference Between Nitrile vs Latex Gloves

WHAT MAKES NITRILE RUBBER UNIQUE?

Nitrile rubber is a synthetic rubber copolymer of acrylonitrile and butadiene, also known as NBR, Buna-N, and acrylonitrile butadiene.

Despite the fact that its physical and chemical properties differ depending on the nitrile polymer’s composition, this type of synthetic rubber is unique in that it is typically resistant to oil, gasoline, and other chemicals.

As a result, the higher the nitrile content in a polymer, the greater the resistance to oils but the lower the material’s flexibility. In the seal industry, nitrile is the most used elastomer.

Since ordinary rubbers cannot be used, it is used in the automotive and aeronautical industries to make fuel and oil handling hoses, seals, grommets and self-sealing fuel tanks.

NBR is a suitable material for aeronautical applications because it can withstand temperatures ranging from -40 to 108 °C. Molded products, boots, adhesives, sealants, extended foams, and floor mats are all manufactured with nitrile butadiene.

Also Read:- What is Neoprene Rubber? – Properties, Applications, Uses

ADVANTAGES AND DISADVANTAGES OF NITRILE

ADVANTAGES

Nitrile is a commonly used seal material in a number of industries and applications. NBR is a perfect choice for general purpose applications because of its simplicity and dependability.

Petroleum oils, crude oil, diesel, propane and certain hydraulic fluids are resistant to nitrile rubber. It is also resistant to abrasion and compression collection.

Nitrile is an excellent alternative for a secure and cost effective sealing solution. In the automotive and aerospace industries, it is commonly used.

DISADVANTAGES

Nitrile rubber’s biggest downside is its poor efficiency when exposed to Ultraviolet rays, general weathering and ozone. As a Result, it is not recommended for outdoor use.

Nitrile has a low steam resistance and a temperature range of -25 to 100 degree C. Some of the disadvantages include: –

  • Bad ozone, sunshine and weather tolerance
  • High-temperature resistance is limited
  • Flame Tolerance is also weak

FREQUENTLY ASKED QUESTIONS

1. WHY NITRILE GLOVES ARE BETTER?

Nitrile gloves are known as the most effective hand protection available. A synthetic rubber polymer is used to make nitrile gloves.

Because of its excellent hand safety properties and the fact it is latex-free, nitrile has surpassed latex as the best glove production content.

2. IS NITRILE SAFE ON SKIN?

Most people aren’t aware of it, but Nitrile rubber is the perfect choice for allergy-free gloves. In general, these gloves will be very secure for your hands. Also, people will be able to protect their skin from various chemicals and punctures.

While there are several different styles of disposable gloves on the market, they all contain latex. To get the best security for their hands, people who are allergic to latex should purchase these Nitrile latex-free gloves.

3. WHY NITRILE GLOVES ARE BETTER?

Nitrile gloves are known as the most effective hand protection available. A synthetic rubber polymer is used to make nitrile gloves.

Because of its excellent hand safety properties and the fact it is latex-free, nitrile has surpassed latex as the best glove production content.

CONCLUSION

We hope you can use this knowledge to source more efficiently for your needs, now that we have covered the basics of nitrile rubber, such as what it is, its properties and its applications.

However, nitrile is only one of the several common types of rubbers, each with its own set of characteristics and applications.

Check out our types of rubber guide if you want to learn more about how different rubbers compare to one another or follow us on social media to stay updated

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