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I don't think you will find a big difference in the specifications of thermal plates. I would suggest looking for the following:
1. Bake vs. No Bake - if you don't have to bake the plates, you will save big on electric bills and have one less piece of equipment to break.
2. Availability - be sure your dealer/manufacturer has been around and will stock all the sizes you need (and chemistry) so you won't have any supply problems.
3. Consistancy/Quality/Latitude - this I would say is the most important issue. The only was to judge is to ask for references from your dealer of other users of the plate. Good quality plates depend on a consistant coating and a consistant chemistry strength/temp. If the plates are a new design, it may take a while for the manufacturer to get its production facility to produce consistant plates. When you check references, also ask about any problems with spots or holes in the plates. Most thermal plates are positive working which make them very suseptable to spots.
Good luck ! ...Wayne
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