This fiberglass slice is made of 0.12mm silver PTFE coated fiberglass fabric rolls for stovetop protector purpose. It is used to cover gas range and stovetop burner area, which protect the gas range area from oil, spills and mess. Fiberglass cloth is a durable and heat resistant material. The PTFE coating is food grade and FDA approved. The same material - PTFE coated fiberglass fabric is used to produce BBQ grill mat too.
Fiberglass fabric can be used below 550℃. Working temperature of PTFE coatingis from -70℃ to 260℃. Standard thickness of beige color protector is 0.11mm. Size is common 27x27cm(10.6X10.6") with a 4cm diameter hole.
When you finished using it, this PTFE coated fiberglass products can be cleaned by soapy water. Or please put it into your dishwasher. Totally dishwasher safe.