Arizona Sealing Devices, Inc.
AZ Sealing Devices Catalog > O-Rings > Item # 002  

Item # 002, O-Rings


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Specifications  · Buna/ Nitrile  · Aflas  · Butyl  · Ethylene Propylene  · Fluorocarbon (Viton®)  · Fluorosilicone  · Hydrogenated Nitrile  · Silicone Rubber  · Neoprene  · Polyurethene, Cast  · Polyurethene, Millable  · Kalrez®  · PTFE

Specifications

Actual I.D.

.042±.004 in
1.07±0.10
mm

Actual C.S.

.050±.003 in
1.27±0.08
mm

Nominal Reference I.D.

3/64

Nominal Reference C.S.

3/64

Nominal Reference O.D.

9/64

Material(s) Available

Buna/ Nitrile
Aflas

Butyl

Ethylene Propylene

Fluorocarbon (Viton)

Fluorosilicone

Hydrogenated Nitrile

Silicone Rubber

Neoprene

Polyurethene, Cast

Polyurethene, Millable

Kalrez

PTFE


Buna/ Nitrile
 
Arizona Sealing Devices, Inc. Compound Designation: BN

Standard Color: Black

Description: Presently the seal industry's most widely used and economical elastomer, Nitrile combines excellent resistance to petroleum-based oils and fuels, silicone greases, hydraulic fluids, water and alcohols, with a good balance of such desirable working properties as low compression set, high tensile strength, and high abrasion resistance.

Key Use(s):
  • Oil resistant applications of all types
  • Low temperature military uses
  • Off-road equipment
  • Automotive, marine, aircraft fuel systems
  • Can be compounded for FDA applications

Temperature Range
Standard Compound: -40° to +257°F
Special Compound: -76° to +275°F

Hardness (Shore A): 40 to 90.

Features: Comprised of the copolymer butadiene and acrylonitrile, in varying proportions. Compounds can be formulated for service temperature ranging from -85°F to +275°F. Use of Carboxylated Nitrile can have superior abrasion resistance, while still having improved oil resistance.

Limitations: Nitrile compounds are attached by small amounts of Ozone. Phthalate type plasticizers are commonly used in compounding Nitrile Rubber. These plasticizers can migrate out and cause problems with certain plastics. Also, new regulations on certain phthalates have limited their use.



Aflas
 
Arizona Sealing Devices, Inc. Compound Designation: Aflas

Standard Color: Black

Description: A copolymer of tetrafluoroethylene/ propylene, TFE/P can offer a combination of high temperature and chemical resistance.

Key Use(s):
  • Seals for oil field, aerospace, chemical and general industrial environments.

Temperature Range: Standard Compound: -14° to +446°F.

Hardness (Shore A): 60 to 90.

Features: Resistance to a wide range of chemicals, high temperature and electrical capabilities give broad application diversity. TFE/P has resistance to acids, bases steam/hot water, corrosion inhibitors, oils and lubricants, and industrial solvents. TFE/P also offer improved low temperature properties over most fluoroelastomers.

Limitations: Tests have shown that other FKM elastomers are recommended for automotive fuels since they have less volume swell than TFE/P. Also, TFE/P has shown to have less than desirable results when exposed to toluene, ethers, ketones, and acetic acid.



Butyl
 
Arizona Sealing Devices, Inc. Compound Designation: Butyl

Standard Color: Black

Description: An all-petroleum product, Butyl is a copolymer of isobutylene and isoprene and has largely been replaced by Ethylene Propylene since its introduction.

Key Use(s):
  • Highly effective in vacuum sealing applications.
  • Good seal for hydraulic systems.

Temperature Range: Standard Compound: -50° to +250°F.

Hardness (Shore A): 30 to 90

Features: With outstanding low permeability to gases, Butyl is especially effective in vacuum sealing applications. It also features good to excellent resistance to ozone and sunlight aging. Butyl further features excellent shock dampening capabilities. Only slightly affected by oxygenated solvents and other polar liquids, Butyl is often utilized in seals for hydraulic systems using synthetic fluids. It is good with MEK, and silicone fluids and greases.

Limitations: Because it is a petroleum product, Butyl has poor resistance to hydrocarbon solvents and oils, and diester-based lubricants.





Ethylene Propylene
 
Arizona Sealing Devices, Inc. Compound Designation: EP

Standard Color: Black

Description: A copolymer of ethylene and propylene (EPR), combined with a third comonomer adiene(EPDM), Ethylene Propylene has gained wide seal industry acceptance for its excellent ozone and chemical resistance characteristics.

Key Use(s):
  • Outdoor weather resistant uses
  • Automotive brake systems
  • Automobile cooling systems
  • Water applications
  • Low torque drive belts.

Temperature Range
Standard Compound: -40° to +275°F
Special Compound: -76° to +302°F

Hardness (Shore A): 40 to 95

Features: When compounded using peroxide curing agents high temperature service can reach +350°F. Good resistance to acids and solvents (i.e. MEK and Acetone).

Limitations: Have no resistance to hydrocarbon fluids.





Fluorocarbon (Viton®)
 

Arizona Sealing Devices, Inc. Compound Designation: V

Standard Color: Black

Description: Combining high temperature resistance with outstanding chemical resistance, Fluorocarbon-based compounds approach the ideal for a universal O-ring material.

Key Use(s):

  • Seals for aircraft engines.
  • Seals for automotive fuel handling systems.
  • High temperature/low compression set applications.
  • Wide chemical exposure situations. Hard vacuum service.

Temperature Range
Standard Compound: -13° to +446°F
Special Compound: -40° to +446°F
Hardness (Shore A): 55 to 90.

Features: High fluorine grades offer higher resistance to swell in high octane and oxygenated fuel blends. This provides superior performance in Ethanol/Methanol blended gasoline. Base resistant grades offer improved resistance to amine based oil protectants found in new transmission oils, along with improved resistant to steam for higher temperature services. Low temperature bases can improve performance to -40°F. New Polymers being offered have improved chemical resistance and low temperature performance. Viton® Extreme™ ETP offers similar chemical compatibility as Kalrez™ with temperature performance with a TR(10) of -40°F and brittleness to -76°.

Limitations: Fluorocarbons (Viton®) are not recommended for exposure to ketones, amines, low molecular weight esters and ethers, nitro hydrocarbons, hot hydrofluoric or chlorosulfonic acids, or Skydrol® fluids. They are also not recommended for situations requiring good low temperature flexibility.





Fluorosilicone
 
Arizona Sealing Devices, Inc. Compound Designation: FS

Standard Color: Blue

Description: Fluorosilicone combines the good high and low temperature stability of Silicones with the fuel, oil, and solvent resistance of Fluorocarbons.

Key Use(s):
  • Aerospace fuel systems.
  • Auto fuel emission control systems.
  • Primarily for static sealing applications.

Temperature Range: Standard Compound: -75° to +400°F.

Hardness (Shore A): 40 to 80.

Features: Fluorosilicone is most often used in aerospace applications for systems requiring fuel and/or diester-based lubricant resistance up to 400° F. Although generally specified for aerospace use, due to its excellent fuel resistance and high temperature stability, Fluorosilicone is becoming an increasingly popular material for a wider range of sealing applications. Featuring good compression set and resilience properties, fluorosilicone compounds are suitable for exposure to air, sunlight, ozone, chlorinated and aromatic hydrocarbons.

Limitations: Due to limited physical strength, poor abrasion resistance, and high friction characteristics, Fluorosilicone elastomers are not generally recommended for dynamic sealing. They are predominately designed for static sealing use. They are also not recommended for exposure to brake fluids, hydrazine, or ketones.



Hydrogenated Nitrile
 
Arizona Sealing Devices, Inc. Compound Designation: ZT

Standard Color: Black

Description: HNBR is the product of the hydrogenation of Nitrile, resulting in varying degrees of saturation of the polymeric chain, with accompanying varying degrees of enhanced physical strength and chemical resistance properties.

Key Use(s):
  • ALL oil resistant applications, including exposure to such oil additives as detergents, anti-oxidants and anti-wear agents.
  • Exposure to oil soured with metal sludge.
  • Seals for oil well applications.
  • Seals for automotive fuel handling systems.
  • Seals for general industrial usage.

Temperature Range:
Standard Compound: -30° to +300°F (Dry Heat Only)
Special Compound: -76° to +347°F

Hardness (Shore A): 50 to 90

Features: Compounds can be formulated for service temperature ranging from -85°F to +350°F. Like Nitrile, increasing acrylonitrile content improves oil resistance at a cost of reduced low temperature performance. HNBR offers improved physical properties and better ozone resistance to Buna-N compounds. HNBR should be used when oil seals are also exposed to weather or environmental ozone.

Limitations: Like Nitrile, HNBR is not recommended for exposure to ethers, esters, ketones, or chlorinated hydrocarbons.



Silicone Rubber
 
Arizona Sealing Devices, Inc. Compound Designation: S

Standard Color: Red

Description: LSR is a low viscosity silicone elastomer intended for use in liquid injection molding (LIM) equipment. It offers high thermal stability and flexibility at low temperatures, high transparency and is easily colored. Also, self-lubricated and electrically conductive grades are available as well as FDA, ISO 10993 and Class VI medical compliant grades. Liquid silicone rubber is widely used to mold complex profiles because of its excellent flow characteristics.

Key Use(s):
  • Static seals in extreme temperature situations.
  • Environmental housing seals. Seals for medical devices.
  • Complex profiles and high volume productions due to reduced cycle times.

Temperature Range:
Standard Compound: -85° to +400°F
Special Compound: -148° to +400°F

Hardness (Shore A): 10 to 80

Features: Silicone oil impregnated, allows for self-lubrication material.

Limitations: Generally, low abrasion and tear resistance, and high friction characteristics preclude silicones from effectively sealing some dynamic applications. Silicones are also highly permeable to gases and are generally not recommended for exposure to ketones (MEK, acetone) or concentrated acids.



Neoprene
 
Arizona Sealing Devices, Inc. Compound Designation: Neop

Standard Color: Black

Description: One of the earliest of the synthetic materials to be developed as an oil-resistant substitute for Natural Rubber, Neoprene is a homopolymer of chloroprene (chlorobutadiene).

Key Use(s):
  • Numerous component uses in the transportation field.
  • Recommended for exposure to weathering.
  • Preferred sealing material for refrigeration industry.
  • FDA approved for food & beverage industry use.

Temperature Range:
Standard Compound: -40° to +250°F (Dry Heat Only)
Special Compound: -67° to +250°F

Hardness (Shore A): 40 to 90.

Features: Neoprene can be used in innumerable sealing applications due to its broad base of such desirable working properties as: good resistance to petroleum oils; good resistance to ozone, sunlight and oxygen aging; relatively low compression set; good resilience; outstanding physical toughness; and reasonable production cost. Due to its excellent resistance to Freon® and ammonia, Neoprene is also widely accepted as a preferred material for refrigeration seals.

Limitations: Neoprene is generally attacked by strong oxidizing acids, esters, ketones, chlorinated, aromatic and nitro hydrocarbons. Because Nitrile is economically competitive with Neoprene, and generally has superior performance characteristics in most situations, it has largely replaced Neoprene in the O-rings of today.





Polyurethene, Cast
 
Arizona Sealing Devices, Inc. Compound Designation: Poly Urth Cast

Standard Color: Amber

Description: Cast Polyurethane is outstanding over other O-ring elastomers in abrasion resistance and tensile strength. Additionally, Cast Polyurethane surpasses the performance of Millable Polyurethane in its higher tensile strength, greater elongation, wider temperature range, and lower compression set characteristics.

Key Use(s):
  • Seals for high hydraulic pressures.
  • Situations where highly stressed parts are subject to wear.
  • Used for wheels, rolls, slurry parts, bumpers, couplers, and shock absorbers.
  • Wiper seals for axially moving piston rods.

Temperature Range: Standard Compound: -30° to +175°F.

Hardness (Shore A): 70 and 90.

Features: With tensile strength of up to 6,000 psi, elongation of 350 to 650%, compression sets of 10 to 25%, and exceedingly high abrasion resistance, the physical properties of Cast Polyurethane are among the best of all O-ring elastomers.

Although they swell slightly upon exposure, Cast Polyurethane compounds feature excellent resistance to mineral-based oils and petroleum products, aliphatic solvents, alcohols and ether. They are also compatible with hydraulic fluids, weak acids and bases, and mixtures containing less than 80% aromatic constituents.

Limitations: Cast Polyurethanes are not recommended for exposure to concentrated acids and bases, ketones, esters, very strong oxidizing agents, pure aromatic compounds and brake fluids. With the exception of special compounds, they are also not recommended for exposure to hot water or steam.





Polyurethene, Millable
 
Arizona Sealing Devices, Inc. Compound Designation: Poly Urth Mil

Standard Color: Black

Description: Millable Polyurethane is outstanding over most other O-ring elastomers in abrasion resistance and tensile strength.

Key Use(s):
  • Seals for high hydraulic pressures.
  • Situations where highly stressed parts are subject to wear.

Temperature Range: Standard Compound: -30° to +175° F.

Hardness (Shore A): 40 to 90

Features: Millable Polyurethane offers superior seal performance in hydraulic situations, where high pressures, shock loads, or abrasive contamination is anticipated. Millable Polyurethane possesses chemical compatibility similar to that of Nitrile, offering good resistance to petroleum-based oils, hydrocarbon fuels and hydraulic fluids, the oxidizing effects of ozone, and the aging effects of sunlight. It also has good tear resistance.

Good low temperature flexibility is also a feature of many Millable Polyurethane elastomer compositions.

Limitations: Unless specially compounded, at elevated temperatures Millable Polyurethane begins to soften, losing its physical strength and chemical resistance advantages over other polymers. Tending to rapidly deteriorate when exposed to concentrated acids, ketones, esters, chlorinated and nitro hydrocarbons, Millable Polyurethanes are also prone to hot water and steam degradation.



Kalrez®
 
Arizona Sealing Devices, Inc. Compound Designation: KA

Standard Color: Black

Description: FFKM parts are made from a Perfluoroelastomer (Kalrez®) possessing exceptional resistance to degradation by aggressive fluids and/or gases.

Key Use(s):
  • Seals for use in the chemical and petroleum industries as well as for the manufacturing of semiconductors and analytical and process instruments.
  • It is also used for high temperature applications and for paint and coating operations.

Temperature Range: Standard Compound: -13° to +600°F.

Hardness (Shore A): 65 to 90

Features: FFKM combines the toughness of an elastomeric material with the chemical inertness of Teflon™. It resists attack by nearly all chemical reagents and provides long-term service where corrosive additives can cause other elastomers to swell or degrade. In addition, FFKM parts are less likely to cold flow than Teflon seals.

Limitations: Withstanding degradation by virtually ALL chemicals, FFKM can swell significantly when exposed to some fluorinated solvents, fully halogenated freons and uranium hexafluoride. In addition, FFKM parts should not be exposed to molten or gaseous alkali metals.

As the thermal coefficient of expansion for FFKM is stated by the manufacturer to be "about 50% greater than for fluoroelastomers", gland volume may have to be increased to allow for this expansion in elevated temperature situations.

Because of its high cost, FFKM is generally used when no other elastomer is appropriate.



PTFE
 
Arizona Sealing Devices, Inc. Compound Designation: TF

Standard Color: White

Description: PTFE is a tough, chemically inert polymer possessing an incredible working temperature range.

Key Use(s):
  • Seals for wide chemical exposure situations, with special emphasis on temperature extremes.
  • For static and slow intermittent dynamic situations.

Temperature Range: Standard Compound: -300° to +450°F.

Hardness (Shore A): 98

Features: PTFE is inert to virtually all industrial chemicals, even at elevated temperatures. Seals fabricated from this material feature outstanding weather resistance, high resistance to Ozone, and high resistance to the degrading effects of exposure to such solvents as acetone, MEK, and xylene. Possessing average elastomer characteristics of 2,500 to 3,500 psi tensile strength, and 300% elongation, they are tough, impact resistant, low friction, non-twisting performers over an extremely wide temperature range.

Limitations: PTFE is hampered by very poor elastic memory at room, or low temperatures. This presents problems in O-ring installation, requiring extra care to be taken in control over O-ring I.D. stretch. Heating PTFE in boiling water, or in controlled oven, to 200°F is said to enable an O-ring stretch of 10 to 20% to be achieved, thereby assisting installation, and helping to assure tight fit.

Because of its poor tear resistance, during O-ring installation particular care should be taken to avoid nicking or scratching PTFE, as imperfections will cause O-ring leakage.

Finally, the tendency of virgin PTFE to cold flow over time, under gasketing pressures, may require special material compounding (with fillers) to control such “creep” in critical sealing situations.