I purchased a silpat .. I pre-heated it to 350 and within a few minutes the silpat caught on fire. what a mess!! white/grey powder, smoke and flames. there is a white film all over my apartment and throughout my oven. i hate to think of what i breathed in, glass and silicone. I DON'T KNOW HOW I FEEL ABOUT THE PRODUCT BECAUSE I NEVER GOT A CHANCE TO USE IT BUT WOULDN'T BUY IT AGAIN. I'M WRITING THIS TO PEOPLE WHO HAVE IT OR WANT TO PURCHASE IT. BE CAREFUL IF YOU USE IT. I NEVER THOUGHT IT WOULD CATCH ON FIRE. IF YOU ARE BAKING, PLEASE DON'T LEAVE IT UNATTENDED. I'M LUCKY I WAS IN THE KITCHEN, AND IT HAPPENED WITHIN MINUTES OF TURNING ON THE OVEN. there should be better marked cautions on it because i don't know why it happened. Maybe it is great for baking, but please be careful.