O-ring information shelf life..
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O-ring information shelf life..
I thought I would post this for anyone using NOS parts or needing hard to find O-rings.. Or using those old o-rings that have been laying around.
Cure DateA cure date is as applicable to natural or synthetic O-rings as it is to rubber hoses. This date is the basis for determining the age of O-rings. It is extremely important that the cure date be noted on all packages.
Shelf Life and Expiration Date
All elastomers change gradually with age; some change more rapidly than others. The shelf life for rubber products is contained in MIL-HDBK-695.
Check the age of natural or synthetic rubber preformed packings before installation to determine whether they are acceptable for use. Make a positive identification, indicating the source, cure date, and expiration date. Ensure that this information is available for all packing used. Shelf life requirements do not apply once the packing is installed in a component. The expiration date is the date after which packing should not be installed. The expiration date of all packings can be determined by adding the shelf life to the cure date.
http://www.tpub.com/fluid/ch2o.htm
ARP 5316 Elastomer Shelf Life Recommendation
The Society of Aerospace Engineers (SAE) issued Aerospace Recommended Practice (ARP) 5316. It was issued in 1998 to supersede MIL-HDBK-695 as the aerospace industry standard in governing o-rings and molded seals shelf life. ARP 5316 is often used as a guideline in determining useful shelf life of elastomers used in other industries.
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There is a chart on the page above that gives dates on different materials
Cure DateA cure date is as applicable to natural or synthetic O-rings as it is to rubber hoses. This date is the basis for determining the age of O-rings. It is extremely important that the cure date be noted on all packages.
Shelf Life and Expiration Date
All elastomers change gradually with age; some change more rapidly than others. The shelf life for rubber products is contained in MIL-HDBK-695.
Check the age of natural or synthetic rubber preformed packings before installation to determine whether they are acceptable for use. Make a positive identification, indicating the source, cure date, and expiration date. Ensure that this information is available for all packing used. Shelf life requirements do not apply once the packing is installed in a component. The expiration date is the date after which packing should not be installed. The expiration date of all packings can be determined by adding the shelf life to the cure date.
http://www.tpub.com/fluid/ch2o.htm
ARP 5316 Elastomer Shelf Life Recommendation
The Society of Aerospace Engineers (SAE) issued Aerospace Recommended Practice (ARP) 5316. It was issued in 1998 to supersede MIL-HDBK-695 as the aerospace industry standard in governing o-rings and molded seals shelf life. ARP 5316 is often used as a guideline in determining useful shelf life of elastomers used in other industries.
<table width="776" border="0" cellpadding="0" cellspacing="0"><tbody><tr valign="TOP" align="LEFT"> <td height="5" width="33">
</td> <td width="743"></td> </tr> <tr valign="TOP" align="LEFT"> <td></td> <td class="TextObject" width="743">
Recommended Shelf life
- 5 years: Polyurethane (millable), SBR, Natural Rubber, Polybutadine, Polyisoprene
- 15 years: Nitrile, Neoprene, HNBR, Polyacrylate, Butyl
- Unlimited: Ethylene Propylene, Fluorocarbon, Perfluorinated Elastomer, Silicone, Tetrafluoroethylene Propylene (Aflas®), Fluorosilicone.
There is a chart on the page above that gives dates on different materials
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