Selling Cheap Glasswool from Mekar Mas Jaya in Jakarta. Glasswool is one of the insulation materials made from glass fibers that are arranged using a binder into a texture similar to wool. Glass wool products are produced in rolls or sheets, with different thermal and mechanical properties. Glasswool is widely used for insulation / silencer heat and sound dampening. This product is easy to use and elastic so it is easy to install as needed. Glasswool is widely used as a layer under factories, warehouses, houses, offices, soundproofing music studios, soundproofing car engines, and others.