Johns Manville Precipitator Spin-Glas® is a semi-rigid, lightweight industrial equipment insulation specifically designed for insulating precipitators, baghouses, scrubbers, ducts and breechings in power-generation plants. It can also be used for insulating boilers, heaters, ovens and other industrial equipment. Precipitator Spin-Glas is available in a variety of standard and custom sizes and is an excellent choice for applications that do not require higher densities.