125mm Earthwool DriTherm 32 Cavity Slab is a semi-rigid insulation material made from non-combustible, water repellent, glass mineral wool. They are 1200mm x 455mm wide to suit standard vertical wall tie spacings, ensuring a closed joint with adjacent slabs. Manufactured with Knauf ECOSE Technology - no added formaldehyde binder, which is up to 70% less energy intaensive than traditional binders and is made from rapidly renewable bio-based materials instead of petroleum-based chemicals.