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All JRC slates come with data sheets which outline how the slates fared in testing situations. This can give you guarantees about how the slates will perform on your roof and let you calculate what is needed to get the best result.
The data sheets contain a lot of information for each slate, and this can get confusing. For detailed explanations on each requirement and testing criteria, take a look at the links below:
Effect of exposure to sulphur dioxide solutions S1, S2, S3
Effect of the Thermal Cycle Test T1, T2, T3
Effect of water absorption