AS568-225 Buna-N 70 Duro Black FDA O-Ring for 1-7/8 ID X 1/8 CS

Buna-N O-Rings 70 Duro Black FDA BN700101-225

$ 0.3389 per Each

Minimum Order Quantity (MOQ): 89

Ships within 10 days

Qty	Price
89 - 103	$0.3389
104 - 221	$0.2542
222 - 442	$0.2033
443 - 885	$0.1525
886 - 1770	$0.1186
1771+	$0.1017

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	225
Fractional	ID: 1-7/8 CS: 1/8 OD: 2-1/8
Actual (Inch)	ID: 1.859 ± 0.018 CS: 0.139 ± 0.004 OD: 2.137
Actual (Metric)	ID: 47.22 ± 0.46 CS: 3.53 ± 0.10 OD: 54.280

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).