It's used on many things such as the gasket inside the screw-on cap of a spray bottle. It's also on the inside of my alcohol dispensing container bottle and other types of plastic bottle caps. I need to make some more to fix some bottle leaks. I cannot find this in a craft store. It's 1 mm thick. It is not hard plastic, it's some type of foam.
Does anyone know what it's called and where I can get a sheet of it (I'll make my own gaskets from the sheet).
Thanks.