4.3.2 Effect of Plastic Adhesive Tape
The PTFE, 304 stainless steel, and white plastic adhesive tape contributed to the incident. The PTFE inner core was permeable and susceptible to phosgene vapor diffusing through the hose. The adhesive tape used to secure the tag contributed to the retention of phosgene gas on the exterior of the stainless steel overbraid. The phosgene gas converted to HCl, and 304-stainless steel overbraid is subject to corrosive attack by HCl. Since the white plastic adhesive tag trapped the phosgene permeating through the PTFE inner core, the resulting concentration of HCl was much higher under the tag than elsewhere on the hose