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FAQs

What does NBR mean for O-rings? ›

Nitrile rubber (NBR) o-rings, also known as Buna-N, are one of the most commonly used sealing elastomers due to their resistance to petroleum-based fuels and lubricants and their relatively low price. Nitrile elastomers are copolymers of acrylonitrile and butadiene.

Both Viton and NBR are synthetic rubbers, but they have different compositions. Nitrile rubber uses carbon and hydrogen, creating a butadiene monomer. Viton rubber is carbon, fluorine, and hydrogen, creating a fluorine elastomer.

Meaning, nitrile can offer superior strength and provide more resistance than natural rubber to oils and acids. However, as the resistance to petroleum-based oils and hydrocarbon fuels increases with the increase in NBR content, the flexibility of the material decreases.

HS Code 40169320 | Harmonized System Code Rubber Rings (O-Ring)

NBR's ability to withstand a range of temperatures from -40 to 108 °C (-40 to 226 °F) makes it an ideal material for aeronautical applications. Nitrile butadiene is also used to create moulded goods, footwear, adhesives, sealants, sponges, expanded foams, and floor mats.

Disadvantages. Despite being one of the best elastomers, Viton has its disadvantages as well. While it's known for its fluid resistance, it is not resistant to ketones, esters, and organic acids. Viton is able to withstand extreme temperatures, but it is still affected at both ends of the spectrum.

Buna is effective to 250°F. However, it can effectively seal mechanical objects at low temperatures to –22°F. Viton seals are rendered ineffective at temperatures below 5°F, with the material becoming hard and inflexible. Environmental conditions also differentiate the application of Buna vs.

Nitrile rubber gaskets are well known for providing excellent resistance against most fuels, oils and grease. It is this resistance that often makes them the first choice for use in automotive, aerospace and oil industries. Nitrile gaskets also feature good physical properties, providing abrasion and tear resistance.

The main disadvantage of nitrile rubber is its poor performance when exposed to UV, general weathering and ozone. It is therefore not advisable for outdoor applications. Nitrile offers relatively poor steam resistance and an unremarkable operational temperature range of -25 °C to +100 °C.

Are thicker O-rings better? ›

The thickness of an O-ring plays a pivotal role in its performance. Thicker O-rings are generally more robust and can endure higher pressures. As the thickness increases, the O-ring's cross-sectional area also expands, allowing for improved sealing capacity.

The best way to size an o-ring is by measuring the CS (cross-section) and ID (inside diameter). For measuring the cross-section, it is best to use a caliper, a.k.a. micrometer.

For example, blue o-rings might signify resistance to low temperatures, while brown ones may indicate resistance to high temperatures. 4. Branding and Standardization: In some cases, manufacturers use color-coding as a form of branding or to comply with industry standards.

NBR Meaning - Nitrile Butadiene Rubber for Gaskets and Seals

This is a synthetic rubber that was developed during the 1930s. It is fabricated through the co-polymerization of acrylonitrile (ACN) (polar building block) and 1.3-butadine (nonpolar building block).

This posting type is used for an item of revenue, in respect of the firms own business, paid into the office bank, e.g. Injection of capital.

HNBR has better heat resistance; oxidation resistance; tensile strength and abrasion resistance than standard nitrile (NBR). Also an excellent choice for automotive refrigerant service. Both o-rings and gaskets can be made from Nitrile materials.

Nitrile rubber, also known as nitrile butadiene rubber, NBR, Buna-N, and acrylonitrile butadiene rubber, is a synthetic rubber derived from acrylonitrile (ACN) and butadiene. Trade names include Perbunan, Nipol, Krynac and Europrene. This rubber is unusual in being resistant to oil, fuel, and other chemicals.