11 Asbestos Safety Manual Environmental Health and Safety Thermal System Insulation (TSI) • Insulation used to inhibit heat transfer or prevent condensation on pipes, boilers, tanks, ducts, and various other components of plumbing and heating, ventilation, and air conditioning (HVAC) systems. Materials include pipe wraps (block, batt, and blanket), gaskets, and “muds”. Miscellaneous Materials • Other materials such as floor tile, ceiling tile, adhesives, asbestos-cement products, window glazing, caulking, textiles, and roofing materials. By the mid-1970’s under the Clean Air Act (CAA), the EPA banned several kinds of asbestos materials such as thermal, sprayed-on insulation, fireproofing, and acoustical surfacing material because of growing concerns about the health effects associated with exposure to asbestos. Campus Survey Asbestos building surveys were conducted at Iowa State University (ISU) using accredited inspectors following Asbestos Hazard Emergency Response Act (AHERA) protocols (exteriors and roofs excluded) to assess the location, quantity, and physical condition of ACM. With the exception of the newest buildings on campus, most contain asbestos in one form or another. Miscellaneous materials (floor tile, mastic, and caulking) are the most common ACM on campus, followed by surfacing materials (acoustical ceiling treatments) and thermal system insulation on pipes. Environmental Health and Safety (EH&S) completed repair to those ACM with minor damage identified during the building surveys. Asbestos building survey information is available for the purpose of identifying ACM locations prior to construction activities. Since the asbestos building surveys are not all inclusive and did not include destructive testing, EH&S requires the survey information be field verified for accuracy prior to the start of any renovation and demolition activity. See Appendix A for a representative list of materials likely to contain asbestos. Asbestos Identification ACM are those materials that contain more than 1% asbestos as determined by Polarized Light Microscopy (PLM) following EPA Method 600/R-93/116. EH&S operates an asbestos fiber counting and bulk identification laboratory. Departmental personnel are trained and tested quarterly to meet proficiency standards established by the American Industrial Hygiene Association (AIHA).