Popular articles

What temperature is Buna good for?

What temperature is Buna good for?

Buna on the other hand is only effective up to 250°F. However, Buna seals provide a low temperature sealing option with effective sealing down to temperatures of –22°F, while temperatures below 5°F render Viton seals ineffective as they become quite hard and inflexible.

What is the difference between nitrile and Buna N?

Acrylonitrile Butadiene Rubber (NBR) or Nitrile rubber is one of the most popular compounds for automotive applications. It also is well known as Buna-N. However, the rubber will have less flex at lower temperature. The final compound will have a higher glass transition temperature.

What is Buna material?

Nitrile rubber — also known as acrylonitrile butadiene rubber, NBR, or Buna-N — is a synthetically produced, petroleum-based rubber ideal for seals, gaskets and o-rings. Nitrile is a highly versatile rubber. It is used in countless applications and products, from marine fuel systems to small engine carburetors.

How can you tell the difference between Buna and Viton?

Both these elastomers are widely used synthetic elastomers that possess a unique set of physical and chemical properties. The key difference between Buna N and Viton is that Buna N is a copolymer of butadiene and acrylonitrile, whereas Viton is a copolymer that contains a high amount of fluorine-containing units.

What are the properties of Buna S?


Property S-SBR E-SBR
Tensile strength (MPa) 18 19
Elongation at tear (%) 565 635
Mooney viscosity (100 °C) 48.0 51.5
Glass transition temperature (°C) -65 -50

Are Viton O-rings black?

This O-Ring set is made of Black Viton, has a durometer of 90A, and includes 382 pieces covering 30 dash sizes. The rings have a Round cross-section and can be used across a wide temperature range from -15 degrees F (-26 degrees C) to 450 degrees F (232 degrees C).