CURING |
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The curing of product can be split into three categories
as follows:
Normal - Post - Shock
Normal cures are carried out at room temperature
(15oC - 35oC) check in the Advanced
Polymer Engineering and Application data sheets.
Post application of high heat ALWAYS AFTER
NORMAL CURE AT ABOVE TEMPERATURES has been established.
Shock high heat to early. NEVER apply
HIGH HEAT until NORMAL cure AT ambient temperatures has
been achieved. |
| How to Post Cure |
Seal the object to be POST CURED from the
surroundings as follows:
1. Close all doors and windows etc -
if it is a room. Close the gates, valves, hatches, lids
etc. - if it is the interior of a piece of equipment.
Erect a make shift tent around it, if it is the exterior
of a piece of equipment, or use other such techniques
as make themselves available.
2. Apply heat in a stepwise manner:
12 + hours @ ambient temperature +
4 hours @ 50oC +
4 hours @ 70oC +
4 hours @ 90oC
Or if you do not have the capability of stepwise heat
build up, and have only say 70oC available,
then apply this heat for a longer period of time: 24 hours.
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| Why we need to Post Cure |
| Post cure energizes the molecules and causes the polymer
chains to weave a tighter network via cross-links. All of
this increases the heat resistance and chemical resistance
of the polymer. Post cure is good for you, though not always
required or even justified. So go on a case by case basis
or ask your local distributor for more information. |
| Benefits of Post Cure |
Increased performance (10-50% depending on type of post
cure and property).
Consider using Post Cure when service temperature or chemical
resistance requirements are "Borderline" cases. |
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