- “9” Non-adherence of molten metal and resistance to penetration of hot solids
- “B” High speed particles with medium energy impact (120 m/s)
- “T” Additional resistance at extreme temperatures (–5 and +55 °C)
- “3” Liquid droplets and splash
- “8” Electric arc resistance
- Features a heavy-duty, flat, rubber strap can be used with slotted and non-slotted MSA helmets
