41. Compressed briquettes can also be used as a fuel for starting fires or as an insulating material . 42. Steel-framed houses also need extra insulating material because steel conducts heat and cold far more readily than wood. 43. If the conductive paths ultimately bridge the insulating space, the result is catastrophic failure of the insulating material . 44. The quality of capacitors may vary considerably depending on their construction and the type of insulating materials used. 45. PCBs, which were banned by the federal government in 1977, were used as an insulating material in electric equipment. 46. The window had been covered with insulating material before the shutter was installed, and no one could look out. 47. Muscovite is in demand for the manufacture of fireproofing and insulating materials and to some extent as a lubricant. 48. Look between the joists for insulating materials ; these may be in the form of insulation batts or loose fill. 49. Experts detected the presence of PCBs, polychlorinated biphenils, a toxic substance formerly used in insulating material , in the building. 50. They are made of flat galvanized sheet and are also lined with the same insulating material as the roof.
