Profile: Kemwell Thermal Ltd. provides on-site heat treatment contract services, technical operation & detailed design, on-site supervision, documentation control and equipment manufacture. Our HF Board is clean & light weight, and ideal for drywall construction. It's 100% asbestos-free autoclaved light-weight calcium silicate building board is manufactured from a homogeneous mixture of cement, organic cellulose fibers and selected mineral binder; it is vermin resistant and does not rot.