Nitrile Buna-N

Nitrile (Buna-N)

Trade Name(s):
NipolZeon
KrynacBayer Polymer
NysynDSM Elastomers
ChemigumEliokem
ASTM D1418 Designation:NBR
Standard Colour:Black
Description:

Nitrile rubber (NBR) is the general term for Acrylonitrile Butadiene Copolymer. It is the most widely used and economical elastomer. NBR offers excellent resistance to petroleum-based oils and fuels, silicone greases, hydraulic fluids, water and alcohols. It provides a good balance of desirable working properties including low compression set, high tensile strength, and high abrasion resistance. Use of Carboxylated Nitrile can have superior abrasion resistance, while still having improved oil resistance.

The most widely used compounds have a Nitrile (ACN) content of approximately 32% and are known as “Medium Nitrile”. Compounds having approximately 50% ACN content are known “High Nitrile” these are usually specified for use with Hydrocarbon fuels. Compounds having approximately 18% ACN content are known “Low Nitrile” these are usually specified for use with Low temperature applications.

To find out more technical information, please see our Material Data Sheets page.

Key Use(s):

Oil resistant applications of all types Low temperature military uses. Off-road equipment. Automotive, marine, aircraft fuel systems. Can be compounded for FDA applications.

Temperature Range:
Standard Compound:-40°C (-40°F) to +110°C (230°F) (+135°C for short periods only)
Special Compounds:-55°C (-67°F) to +110°C (230°F) (+135°C for short periods only – Dry Heat Only)
Hardness (Shore A):40 to 90
Features:

NBR is comprised of the copolymer butadiene and acrylonitrile, in varying proportions. Use of Carboxylated Nitrile can have superior abrasion resistance, while still having improved oil resistance.

Limitations:

Thse compounds are attacked by small amounts of Ozone. Phthalate type plasticizers are commonly used in compounding Nitrile rubber. These plasticizers can migrate out and cause problems with certain plastics. Also, new regulation on certain phthalates have limited their use.

You can buy British Standard NBR70 O-rings and NBR-90 O-rings in our online store. Shop for NBR O-rings now.

Please note: This Material Data Sheet section is to be used as a professional guide only. Some materials are only suitable for certain types of seal, e.g. O-rings. Eastern Seals (UK) Ltd may source their products from a variety of Quality Approved Suppliers and the data shown should not be relied upon by any purchaser without verification of material source.

ES REF
Colour
Temp Range
Shore
Notes
Data Sheet
N50BLACK-35°C to +110°C50General purpose Nitrile.
N60BLACK-35°C to +110°C60General purpose Nitrile.
N70BLACK-35°C to +110°C70General purpose Nitrile.
N70 FDABLACK-35°C to +110°C70Compliant To FDA Regulation Cfr 21 177-2600
N70 FDAWHITE-35°C to +125°C70Compliant To FDA Regulation Cfr 21 177-2600
N70 WRASBLACK-35°C to +110°C70WRAS Approved N70
N70 LTBLACK-45°C to +110°C70Low Temperature type Nitrile
N70HBLACK-35°C to +110°C70High Nitrile – 41% A.C.N content
N70H (High Nitrile)BLACK-35°C to +110°C70High Nitrile – 40% A.C.N content
N70 for CordBLACK-20°C to +120°C (+130°C for short periods)70General purpose Nitrile.
N70BLMDBLUE-25°C to +110°C70METAL DETECTABLE. Developed to support use of Nitrile rubber in food processing applications. The material is electrically conductive. This material has been formulated using only those ingredients determined by the United States Federal Food and Drug Administration (FDA) to be in accordance with Code of Federal Regulations Title 21 (CFR21), Section 177.2600. Fragments as small as 2mm can be identified by in-line metal detection and X-ray equipment.
N70 (Vulcanised Jointed Rings)BLACK-30⁰C to +110⁰C continuous (+130⁰C peak)70Excellent resistance to Mineral oil, Animal oil, Vegetable oil. Low gas permeability. Good resistance to aliphatic hydrocarbons and water. Satisfactory resistance to low temperature flexibility and low pressure steam. Poor weather resistance.
N70 (rotary shaft seals)BLACK-35°C to +110°C70General purpose Nitrile.
N80BLACK-35°C to +110°C80General purpose Nitrile.
N80 FDABLACK-35°C to +110°C80Complies With FDA Regulation 21 CFR177.1550
N85 (Bonded Seals)BLACK-35°C to +110°C85Nitrile for Bonded seals.
N90BLACK-35°C to +110°C90General purpose Nitrile.
N90 FDABLACK-35°C to +110°C90Complies With FDA Regulation 21 CFR177.1550
N90H (high ACN)BLACK-35°C to +110°C90High Nitrile – 45.7% A.C.N
N90H (High Nitrile)BLACK-35°C to +110°C90High Nitrile – 40% A.C.N
N90LTBLACK-45°C to +110°C90Low Temperature type.

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