I recently posted a question in the wrong section here regarding the radio frequency blocking properties of Insul-Brite. I have since done some internet research as well as hands-on experiments and have come to the conclusion that Insul-Brite--as well as some potato chip bags--do block at least enough radio waves to make these products suitable for use in handbags or clutches to protect your credit cards or cell phone from unwanted scanning.

This simple test involves placing a cell phone inside the material and calling the number of the device. If the device receives the call, the material is not blocking radio waves; if the device does not receive the call, the material is blocking radio waves and should protect your device and credit card from thieves.

Have fun doing your own experimentation!

The statements contained here are not a guarantee or warranty but are based on my own experiences. Please take common-sense precautions to protect yourself and your belongings.