Uploaded by technical

2092A-Elastomer-Storage-and-Shelf-Life

advertisement
Quick Reference
Storage & Shelf Life
Recommended storage conditions and shelf life of elastomers/rubber
Elastomers are susceptible to deterioration by aging. The rate of deterioration depends on a number of
factors:• Temperature
store between 15-25°C (59-77°F) and away from direct heat sources
• Light
avoid exposure to direct sunlight, artificial light or UV
• Humidity
below <65% recommended
• Ozone
avoid placing near electric motors or high voltage electrical equipment
• Chemical media
avoid exposure to any liquids or vapours
• Deformation
tension, bending and twisting should be avoided. Do not hang, fold or roll
All elastomer parts manufactured by PPE are clearly marked with the cure date on the packaging.
Under the correct conditions, parts can be stored for the period of time shown in the ‘initial storage’ column
below. Once this time has elapsed the parts must be visually inspected for permanent distortion, mechanical
damage, cracks, hardening or tackiness (softening). If any of these are found, the parts should be discarded.
Providing the parts are satisfactory, further testing should be carried out to ensure their performance
characteristics are unchanged. The parts can then be stored for the ‘extended storage’ period before further
inspection and testing is necessary.
ASTM
Material Type
NR
Natural rubber
IR
Polyisopropene
BR
Polybutadiene
Group A
SBR
Styrene-Butadiene
AU
Polyurethane
EU
Polyurethane
ACM
Acrylic
ECO
Epichlorohydrin
CR
Neoprene
Group B
HNBR
Hydrogenated Nitrile
IIR
Butyl
NBR
Nitrile
CSM
Chlorosulfon Polyethylene
EPDM
Ethylene Propylene
FKM
Fluorocarbon
Group C/X
FFKM
Perfluorocarbon
HPE
Kimura® (High Performance Elastomer)
VMQ
Silicone
FVMQ
Fluorosilicone
Extracted from BS ISO 2230:2002
Initial
Storage
Extended
Storage
5 years
2 years
7 years
3 years
10 years
5 years
 Copyright Precision Polymer Engineering Ltd | 2092A
Download