AS568-391 Buna-N 70 Duro Black FDA O-Ring for 22 ID X 3/16 CS

Buna-N O-Rings 70 Duro Black FDA BN700101-391

$ 10.48 per Each

Minimum Order Quantity (MOQ): 3

Ships within 10 days

Qty	Price
3 - 3	$10.4800
4 - 7	$7.8600
8 - 14	$6.2880
15 - 28	$4.7160
29+	$3.9000

Ordering in large quantities? Ask for a lead time quote — we'll get back to you with pricing and lead time.

Product Details

Material	Buna-N
Temperature Range	-40°F to 250°F
Cross Sectional Shape	Round
Hardness	70
Dash	391
Fractional	ID: 22 CS: 3/16 OD: 22-3/8
Actual (Inch)	ID: 21.955 ± 0.100 CS: 0.210 ± 0.005 OD: 22.375
Actual (Metric)	ID: 557.61 ± 2.54 CS: 5.33 ± 0.13 OD: 568.270

FDA-approved Buna-N (Nitrile) O-rings are made from a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene, specially formulated to meet the Food and Drug Administration (FDA) requirements for food contact applications. These O-rings offer excellent resistance to oils, fuels, and many chemicals while being compliant with FDA regulations for safe use in food processing, pharmaceutical, and medical industries. FDA Buna-N O-rings provide high mechanical strength, outstanding wear resistance, and good tensile strength, making them ideal for sanitary applications.

FDA Buna-N Recommended Uses

Seals and gaskets for food and beverage processing, pharmaceutical applications, medical devices, sanitary sealing applications, food handling equipment, and laboratory applications.

FDA Buna-N Not Recommended

Brake fluid, ozone, UV exposure, phosphate esters, chlorinated hydrocarbons, aromatic hydrocarbons, ketones, strong acids, atmospheric aging.

FDA Buna-N Limitations

Not suitable for ozone, sunlight, or weathering exposure.
Limited performance in high-temperature environments.
Not ideal for strong acids and alkalis.
Not recommended for applications requiring low compression set.

FDA Buna-N Usable Temperature Range

-30 to 250°F (-34 to 121°C)

FDA Buna-N Also Known As

FDA Buna-N, Nitrile, NBR, Nitrile Butadiene Rubber (FDA Compliant).