ISP Company offers the seal industry's largest inventory of o-rings, which includes every standard
AS568 and ISO 3601 size, and the following:
•Inside Diameter from 0.031 in (0.794 mm) to 26.0 in (66.04cm)
•Outside Diameter from 0.094 in (2.38 mm) to 26.5 in (67.31cm)
•Cross Section from 0.031 in (0.794 mm) to 0.250 in (6.35mm)
In addition to standard imperial and metric sizes, ISP Company also carries a wide variety of non-standard
sizes. With over 8,000 different o-ring sizes in-stock, we have exactly what you are looking for and we can
assure immediate delivery of any size in large or small quantities.
Standard O-Ring Material Applications
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. Read More
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. Read More
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. Read More
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. Read More
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®. Read More
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.
Generally pump seals
Single spring mechanical seal
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