Durability of metallic coating for improvement of thermal protective performance of firefighter protective clothing

• Published in: Journal of the Textile Institute Vol. 114; no. 5; pp. 820 - 833
• Main Authors: Naeem, Jawad, Mazari, Adnan, Naeem, Muhammad Salman, Rasheed, Abher, Ahmad, Fayyaz, Ahmad, Sheraz
• Format: Journal Article
• Language: English
• Published: Manchester Taylor & Francis 04.05.2023; Taylor & Francis Ltd
• Subjects: Abrasion resistant coatings; Bending moments; Durability; Exposure; Firefighters; Flux density; Heat flux; Heat transfer; Heat transmission; Magnetron sputtering; Moisture effects; Physical vapor deposition; physical vapor deposition (PVD); Protective clothing; Protective coatings; radiant heat transmission index; Silver; Stability analysis; Thermal protective performance (TPP); transmitted heat flux density; Vapor resistance; Washing; Water vapor
• ISSN: 0040-5000; 1754-2340
• DOI: 10.1080/00405000.2022.2085542

The objective of this study is to investigate the durability of metallic coating for firefighter protective clothing when subjected to different washing cycles. Firefighter clothing ensemble consists of three layers, i.e. outer shell, moisture barrier, and thermal liner. The exposed surface of the outer shell was coated with silver particles through the physical vapor deposition process also called Magnetron sputtering. Afterwards, these specimens were exposed to radiant heat transmission machine at 30 kW/m 2 and 40 kW/m 2 , respectively. It was found that specimens coated with silver particles showed improved thermal protective performance as compared to uncoated specimens. Later on, silver-coated specimens undergo five cycles of washing and their thermal protective performance in terms of transmitted heat flux density Q c (kW/m 2 ) and radiant heat transmission index (RHTI 24 and RHTI 12) was measured. It was found that after five washing cycles, there was a negligible decline in thermal protective performance when exposed to 40 kW/m 2 . Afterwards, bending moment and water vapor resistance properties were measured before and after five washing cycles. It was inferred that there was no considerable difference in bending moment and water vapor resistance after different washing cycles, which confirmed stability of silver coating layers. However, when silver-coated outer shells were evaluated for abrasion resistance, there was a substantial decline in thermal protective performance on exposure to 40 kW/m 2 after one hundred to five hundred cycles of abrasion.