S/G Tape is made of high density pvcfoam tape,It is either single or doubleside adhesive tape with acrylics glue.Theperforated structure of foam can allowair and humidity in and contact withsilicone sealant so that to quicken thecuring for silicone.On the other hand,itcan lower the thermal expansion andcontraction for windows &doors as wellas metal structural buildings.It can becut into different width according torequirement.