What is the difference between high & low modulus silicone?
Silicone is mainly used to make a weatherproof/ waterproof seal on a joint (e.g. between window frame & brickwork or between a bath & a tiled wall). Most building materials when joined together will be subject to movement (e.g. shrinking in Winter & expanding in Summer) whether indoors or outdoors. It is important that the silicone seal is flexible enough to cater for these movements & that the seal stays intact protecting the joints. Low Modulus is more flexible than High Modulus because it requires only a low force to ‘stretch’ it once it’s cured. Low Modulus silicone is therefore normally used on the outside of a building & around bath tubs.
