FDA White Buna

Buna-N is a type of synthetic rubber and an FDA-approved compound, which is widely used for making O-rings, gaskets, seals, and custom molded components for food and pharmaceutical processing industries. At SSP Seals, we specialize in the design and manufacturing of white Buna O-rings for food service and pharmaceutical processing applications. We can provide them in different levels of hardness and durometer.  

Buna-N, also known as NBR rubber or nitrile rubber, is one of the widely used industrial elastomers, which is known for its chemical and oil resistance properties. The nitrile rubber is a copolymer of butadiene and acrylonitrile (ACN). The physical and chemical properties of this elastomer may differ based on its composition. White Buna-N (Nitrile Rubber) is a non-allergenic and non-toxic elastomer, which makes it an ideal choice for building O-rings for repeated food exposure.  

Thermal, Chemical, and Mechanical Properties of White FDA Approved BUNA-N (Nitrile Rubber)

The following properties of nitrile rubber have contributed to its immense popularity across food, pharmaceutical, and other industries.

  • The nitrile rubber can resist vegetable oils, silicone greases, petroleum-based oils, alkalines, diluted acids, water, and hydraulic fluids.
  • It assures high tensile strength and abrasion resistance.
  • This nitrile rubber can withstand a wide range of temperatures from −40° to 121°C.
  • It has a tensile strength of ≥10 N/mm2.
  • The elongation of nitrile rubber at break is 450%.
  • White nitrile rubber is a common choice for applications where appearance can be a concern.
  • The white finish of these FDA Buna-N O-rings makes them desirable for different applications in the medical industry.
  • White-colored finish of these rings can easily highlight leaks, which makes them superior over dark materials.
  • Owing to its aforementioned properties, nitrile rubber is also used for protection and cushioning in food-grade applications.   


SSP Manufacturing, Inc.

Phone: 1-908-852-3125     Email: gm@sspseals.com

White FDA BUNA-N Datasheet

  Properties ASTM Designation Test Method Unit of Measure ASTM D2000 Specification WN70 Metric Compound Property
Original Properties Durometer - D2240-10 Shore A 70± 5 72
Tensile Strength - D412-13 MPa 10 Min 11.6
Elongation Resistance - D412-13 % 250 250
Specific Gravity - D297-13 - Report 1.31
Modulus at 100% Z1 D412-13 MPa Report 3.8
Cure System Z2 - - - Sulfur
Heat Age Durometer Change   ASTM D573-10 70 Hours @100° C Shore A ±15 +5
Tensile Strength Change % -20 -5
Elongation Resistance Change % -40 -15
Compression Set Original Deflection B14 ASTM D395-08 22 Hours @ 100°C % 50 Max 20
IRM901 Oil Resistance Durometer Change EO14 STM D471-12A 70 Hours @100°C Shore A -5 to +15 +5
Tensile Strength Change % -25 +5
Elongation Resistance Change % -45 -5
Change in Volume % -10 to +5 -6
IRM903 OIL RESISTANCE Durometer Change E034 ASTM D471-12A 70 Hours @100°C Shore A 0 to -20 +6
Tensile Strength Change % -5 -5
Elongation Resistance Change % -26 -26
Change in Volume % 0 to +35 +15

Feel free to contact our team today to discuss your requirements for nitrile rubber O-rings. We can customize the FDA white buna O-rings to any specifications as per your requirement. Our experts are always ready to help you make the right selection.  

FDA Approved Seals & Gaskets