Johns Manville SG Series Spin-Glas® insulation is a lightweight blanket made from rotary-process glass fibers bonded with a thermosetting resin for use in many diverse Original Equipment Manufacturer applications including transportation, appliance, HVAC and specialty—primarily in double-wall applications. SG Series Spin-Glas provides superior thermal and acoustical performance and is available in a wide range of densities and thicknesses to accommodate a variety of space requirements.