21. At that time, before the appearance of plastic, porcelain was the best available insulating material . 22. Wild boar rest in shelters, which contain insulating material like spruce branches and dry hay. 23. Insulating materials within transformers and electrical equipment break down to liberate gases within the unit.24. Polyester fiber is used as cushioning and insulating material in pillows, comforters and upholstery padding. 25. Partial discharges within an insulating material are usually initiated within gas-filled voids within the dielectric. 26. Asbestos was reportedly not used in the towers as insulating material for the steel beams. 27. In these types, a non-flammable insulating material was used. 28. Before the shutter was installed, an insulating material had blocked the view through the window. 29. Have an inspector check the furnace as well as the pipes for insulating materials containing asbestos. 30. Until the shutter was installed, the view through the window had been blocked by insulating material .
