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TO 1-1-700 - Robins Air Force Base

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<strong>TO</strong> 1-1-<strong>700</strong><br />

may be used for low temperature sealing operations when<br />

specified in system specific technical data and/or is approved<br />

by the equipment SPM.<br />

12.8 S<strong>TO</strong>RAGE/SHELF LIFE CONTROL OF SEAL-<br />

ANTS.<br />

All sealants have a specified shelf life. The date of manufacture<br />

and the shelf life are listed on each container. The shelf<br />

life is dependant on storing the sealant in its original,<br />

unopened container in an area where the temperature does not<br />

exceed 80 ºF (27 ºC). Sealants shall not be stored in areas<br />

where the temperature exceeds 80 ºF (27 ºC). Prior to use,<br />

sealant containers shall be inspected to determine if the material<br />

has exceeded its shelf life. If a sealant has exceeded its<br />

original shelf life then it shall not be used until the update<br />

testing has been performed. Sealants may be extended onehalf<br />

of their original shelf life after passing the required tests.<br />

Updating may be repeated until sealant fails to pass testing.<br />

No sealant shall be used if it fails testing. Minimum update<br />

testing can be performed as follows.<br />

a. Select one kit of sealant from each manufacturer's batch<br />

of material to be tested for updating.<br />

b. Visually examine the content of each can in the kit. If<br />

the base polymer is lumpy or partially cured or cannot<br />

be mixed with the curing agent, dispose of the opened<br />

kit and all kits from that batch of sealant.<br />

c. If the kit can be blended to form a homogeneous mixture,<br />

determine whether the working time is suitable for<br />

the intended purpose by applying the mixture to a piece<br />

of clean scrap metal. If the working time is not acceptable,<br />

dispose of the opened kit and all others from that<br />

batch.<br />

d. If the working time is acceptable, the applied sealant<br />

shall be tested for proper cure time by periodically<br />

checking its hardness. The batch of sealant represented<br />

by applied test sealant can be extended one-half its original<br />

shelf life if it achieves approximately the same<br />

hardness as sealant from kits of another batch which are<br />

within their established shelf life.<br />

e. This updating process may be repeated until the sealant<br />

fails to pass any of the above tests.<br />

12-36

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