Our silicone products are 100% FDA-approved silicone. FDA silicone will fail the pinch test. It is still 100% silicone according to FDA standards and we have third party tests done to check to make sure the manufacturer is not putting any additives into the mix. We have plenty of testing documentation we'd be glad to share! We don't really recommend using the pinch test, as it is not a scientific test. Curing time can affect the result as well as other production factors.