CauseThis is due to excessive temperature (over 250°C) where the silicone has melted off the protector leaving the bare white glass fibres exposed.There are two potential causes for this issue:A “hot spot” on the pan / cookware being used on the hob. The entire base of the pan does not become overheated just one particular spot on the base of the pan. Customers with this same issue have used other pans from the same set / manufacturer and have had no issues.Alternatively there may be an issue with one of the hobs thermal breakers, please consult with the manufacturer of the hob.This issue is not the fault of the Induction Hob Protector, but possibly a defect in the cookware or an issue with the hob. If this issue occurs, DO NOT continue to use the same pan on the protector as this will cause further damage.