Window 7 users: Hit "log In" to see if your computer is secure and can view the HTTPS:// secure connection, SSL. If not, please call in your O-Ring order. 

8am-4pm Pacific Mon-Fri | 208-413-6377


-206 WN70 FDA White (NBR) Buna-N Nitrile 70 Duro O-Ring


Quantity Discount Prices
Min:  3
  • Model: WN70206
  • -506 in Stock
  • 1/2"ID X 3/4"OD X 1/8"CS
  • Actual: 0.484"ID X 0.139"CS
  • Metric: 12.29mm ID X 3.53mm CS
  • PDF Data Sheets

1/2"ID X 3/4"OD X 1/8"CS

FDA Grade White Buna-N O-Rings 70 Duro (NBR):

Commonly used in applications where food or consumables are present, such as in the food processing, beverage, dairy, meat packing, and pharmaceutical industries. FDA Buna-N O-rings are also found within most food packaging equipment. FDA Buna-N O-rings are sturdy enough to handle suction and discharge for food and dairy products. It withstands temperatures of -40°F to +250°F.  FDA Nitrileis known for its high resistance to animal fat and vegetable oils. FDA Nitrile (Buna-N, NBR) is typically black or white in color. These Buna-N rubber O-rings comply with Paragraph 177.2600 of Title 21, sub-paragraphs a) through d), Code of Federal Regulations, "Rubber Articles Intended for Repeated Use". It should be noted that the Food and Drug Administration does not actually approve any rubber compounds. Rather it publishes a list of permissible ingredients and the maximum allowable concentration of each. Buna-N, also known as nitrile, o-ring is common and the simplest types of seal with an excellent sealing property and durability.

FDA, 3-A, RoHS Compliant, 70 Duro

FDA O-rings are commonly used in applications where food or consumables are present, such as in the food processing, beverage, dairy, meat packing, and pharmaceutical industries.  FDA rubber products are also found within most food packaging equipment, such as gable-top packaging machinery.

Buna-N / Nitrile Recommended uses:

  • General purpose sealing.
  • Petroleum oils and fluids.
  • Gasoline
  • Hydraulic fluids
  • L.P. gases
  • Cold Water.
  • Silicone greases and oils
  • Di-ester base lubricants (MIL-L-7808).
  • Ethylene glycol base fluids (Hydrolubes)

Nitrile is not recommended for:

  • Halogenated hydrocarbons (carbon tetrachloride, trichloroethylene)
  • Nitro hydrocarbons (nitrobenzene, aniline)
  • Phosphate ester hydraulic fluids (Skydrol, Fyrquel, Pydraul).
  • Ketones (MEK, acetone)
  • Ozone
  • Sunlight, UV
  • Weather
  • Strong Acids Ozone
  • Automotive brake fluid

Compound Info:

  • An FDA Grade, Nitrile (Buna-N) compound
  • Color: White
  • Duro: 70
  • FDA: Yes.

Operating temperature: -40° to +250°F

Be the first to write a review.  Write a Review.

Stock O-Rings in over 20 different compounds and durometers the following six are the standard rubber materials in a range of durometers (Shore A) hardness to satisfy practically any service condition:

Viton® / FKM: Fluorocarbon (Viton®) exhibits exceptional resistance to chemicals, oils, temperature extremes (-13°F to +446°F), low compression set, low gas permeability and excellent aging characteristics. Applications include: aircraft engines, automotive fuel handling systems, and chemical processing industries. FKM is also suitable for high vacuum applications. It is not recommended for exposure to ketones, alkalis, and Skydrol® fluids. Custom compounds are available with improved chemical and low temperature resistance.

Buna-N / Nitrile / NBR: Nitrile (Buna-N) is the most widely used elastomer due to its excellent resistance to petroleum products, operating temperature range (-40°F to +257°F) and one of the best performance-to-cost values. It's an ideal material for aerospace, automotive, propane and natural gas applications. Special Hydrogenated Nitrile (HNBR) compounds can improve resistance to direct ozone, sunlight, and weather exposure while increasing temperature range to +300°F.

Ethylene-Propylene / EPDM: EPDM has outstanding resistance to heat, water and steam, alkali, mild acidic and oxygenated solvents, ozone, and sunlight (-40ºF to +275ºF); but it is not recommended for gasoline, petroleum oil and grease, and hydrocarbon environments. This popular rubber compound is usually the first choice for low torque drive belt applications.

Fluorosilicone / FVMQ: Fluorosilicone (-75º to +400ºF) combines the good high and low temperature stability of silicones with the fuel, oil, and solvent resistance of fluorocarbons. FVMQ is unparalleled for aerospace fuel systems, auto fuel emission control systems and to meet or exceed government, military, aerospace, automotive, industrial and commercial specifications. However, due to relatively low tear strength, high friction and limited abrasion resistance of these materials, they are generally not used in dynamic applications. They are also not recommended for exposure to brake fluids, hydrazine, or ketones.

Silicone / VMQ: In the Silicone family, you will find compounds which are superior as static seals in extreme temperature conditions. Standard compounds handle operating temperatures -85º to +400ºF. Silicone compounds are popular in food and medical applications because they are very clean and do not impart odor or taste. Special Phenyl silicones can be used down to -148°F.

Neoprene® / CR: Neoprene (-40º to +250ºF) is reasonably priced and features good resistance to petroleum oils, ozone, sunlight and oxygen aging, relatively low compression set, good resilience and outstanding physical toughness. It is the preferred sealing material for the refrigeration industry because of its resistance to ammonia and Freon®.