PTFE O Ring

Still have questions about finding a standard or non-standard o-ring size?  Feel free to either contact us with your questions or use our online o-ring size search.

When you are ready to get started, submit an online RFQ to receive a  quote from our dedicated sales team within 24 hours. Most likely the size  and compound you require is in our inventory of over 300 Million o-rings.  You receive immediate shipments with no intermediate delays.  Remember: With Apple Rubber, you buy direct.

We offer the following six (6) standard rubber materials in a range of  durometer (Shore A) hardnesses 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.

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®.

Let us know if you require materials to meet the following standards; UL,  MIL, AMS, ASTM, FDA 21 CFR 177.2600, USP Class VI, or ISO 10993. We  have many special compounds that can meet the specification you are  looking for.

Need help choosing an o-ring material? Try our new, Interactive Material  Selection Guide. For assistance with o-ring size or material selection, contact us today.