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5 to 10 years
Nitrile
SBR
Urethane (Polyester)
Hypalon
Butyl
Chloroprene
Ethylene Propylene
Epichlorohydrin
Urethane (Polyether)
HSN- Not listed in MIL-HDBK-695
(Data to date indicates shelf
life of 5 to 10 years)
Up to 20Years
Silicone
Fluorosilicone
Fluoroelastomer
Polyacrylate
Polysulfide
Aflas® - Not listed in MIL-HDBK-695
(Data to date indicates shelf
life of up to 20 years)
Age Resistance of Elastomers
Although when properly stored, elastomers have been
known to shelf age for very long periods of time, the
following chart indicates the generally accepted age
resistance for various elastomers (from MIL-HDBK-695):
Suggested proper storage conditions
O-Rings should be stored in clean, dry, containers away
from ozone, contaminates, sunlight, radiation at a
temperature not to exceed 120°F.
Compound Selection for Fluids and Chemicals (Continued)
Vinyl Chloride
D
D
D
A
E
D
E
D
E
E
Wagner 21B Brake Fluid
C
B
A
D
C
A
D
B
A
E
Water
A
A
A
A
A
A
A
A
A
D
Whiskey, Wines
A
A
A
A
A
A
A
A
A
D
White Pine Oil
B
D
D
A
D
D
A
D
A
E
White Oil
A
B
D
A
D
D
A
D
A
A
Wood Oil
A
B
D
A
D
D
B
D
A
C
Xylene
D
D
D
A
D
D
A
D
B
D
Xylidine (Di-methyl Aniline)
C
C
B
D
D
C
D
C
E
E
Zeolites
A
A
A
A
E
A
A
A
A
E
Zinc Acetate (aq)
B
B
A
D
D
D
D
A
D
D
Zinc Chloride (aq)
A
A
A
A
A
A
A
A
A
E
Zinc Sulfate (aq)
A
A
A
A
A
B
A
A
A
E
A. SATISFACTORY B. FAIR C. SEVERE EFFECT – EXCEPT FOR SOME STATIC APPLICATIONS D. UNSATISFACTORY E. INSUFFICIENT INFORMATION
Notes:
(1) Temperature, concentrations, impurities, and other chemicals present can effect the chemical resistance of an elastomer. It is not possible to test in all chemicals and therefore some
chemical resistance indicators are based on the manufacturer’s best estimates known about various classes and the composition of the elastomer. Therefore, manufacturers do not
certify results from a performance standpoint but state they should be used only as indicators of chemical resistance. APG assumes no responsibility whatsoever.
(2) The information contained in these tables was derived from several sources and is to be used as a general guide only. Compounds suitable for any specific application rests solely by
the end user. APG assumes no responsibility whatsoever.
URETHANE
AFLAS
®
BUTYL
FLUORO-
SILICONE
STYRENE
BUTADIENE
(SBR)
SILICONE
FLUORO-
ELASTOMER
ETHYLENE
PROPYLENE
(EPR)
NITRILE
CHLORO-
PRENE
Age Controls
Because of short shelf life of very early Neoprene and/or
Neoprene/Nitrile blends, the Government imposed an Age
Control Program known as ANA Bulletin 438C on Military
O-Rings. Its step-by-step schedule allowed the
manufacturer (or his agent) four quarters beyond the part
curing date to deliver it to the component builder. They had
two more quarters to install the oldest part in their
equipment. These components then had a maximum of 12
quarters (3 years) until delivery of the aircraft to the
Government. This applied only to Nitrile Compounds.
Those of other polymers were not covered.
As a result of long-term evaluations of stored O-Rings by a
number of Air Force, Army, and Navy laboratories and a
long-term study by the O-Ring industries laboratories and
investigations of long stored and long lost crashed aircraft
hydraulic systems, it is concluded that modern Nitrile
Compounds are safe to use 5 to 10 years (varying on who
makes the conclusion) after the date of the manufacture.
Further information may be found in Air Force Technical
Report AFML-TR-67-235, if desired.
MIL-STD-1523A dated Feb. 1, 1984 replaced MIL-STD-
1523 and now allows the manufacturer of the O-Ring or his
agent a full 40 quarters (10 years) to deliver his product to
the procuring activity or contracting officer. MIL-STD-
1523A does not control the age beyond this point for O-
Rings although it is still very restrictive for hose which is
also covered. Military Material specifications covered by
MIL-STD-1523 include: MIL-P-5315, MIL-P-5510, MIL-P-
5516, MIL-S-6855CI.I, MIL-R-7362, MIL-P-25732, MIL-P-
83461.