Difference between BUNA-N and BUNA-S

BUNA-N and BUNA-S are two types of synthetic rubber, but they have different properties.

The main difference is that the BUNA-N is more resistant to oils and fuels while the BUNA-S is more resistant to heat and chemicals.

Before we move to the differences, let’s understand what are BUNA-N and BUNA-S:

  • BUNA-N: BUNA-N (also known as Nitrile rubber) is a synthetic rubber that is made from acrylonitrile and butadiene. It is known for its excellent resistance to oils and fuels, making it a popular choice for applications such as seals and hoses.
  • BUNA-S: BUNA-S (also known as Styrene-butadiene rubber) is a synthetic rubber that is made from styrene and butadiene. It is known for its excellent resistance to heat and chemicals, making it a popular choice for applications such as tires and conveyor belts.

BUNA-N vs BUNA-S

Now, let’s move to BUNA-N vs BUNA-S:

Major differences between BUNA-N and BUNA-S

BUNA-N BUNA-S
BUNA-N is more resistant to oils and fuels. BUNA-S is more resistant to heat and chemicals.
BUNA-N has better low-temperature flexibility. BUNA-S has better high-temperature stability.
BUNA-N has good ozone and weather resistance. BUNA-S has good abrasion resistance.
BUNA-N is used in seals, hoses, and gaskets. BUNA-S is used in tires, conveyor belts, and seals.
BUNA-N is less expensive than BUNA-S. BUNA-S is more expensive than BUNA-N.

 

That’s it.

Note that sometimes, the question might also be asked as “distinguish between BUNA-N and BUNA-S”.

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Final words

BUNA-N and BUNA-S are two types of synthetic rubber that have different properties. The choice of which one to use depends on the specific application and the type of environment the rubber will be exposed to.

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