The outer shell probably has the most demanding role in the total configuration of bunker gear. It has two critical functions: to resist ignition from direct flame impingement and to protect the internal layers from rips, tears, slashes, abrasion, etc. Some outer shell materials can have modest impact on TPP tests or can resist water absorption better than others. The real test of an outer shell material is its ability to maintain its protective qualities under high thermal loads and to stand up on the fireground.
 

Outer Shell

Working Weight1

Thermal Damage2

Durability3

Water Resistance4

Colour Fastness5

Cost

PBI® Matrix
 7.25 oz/yd2

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$$$$

Advance Ultra™
 7.5 oz/yd2

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$$$

Fusion™
 7.0 oz/yd2

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$$

Crusader®
 7.5 oz/yd2

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$$

Nomex® IIIA
 7.5 oz/yd2

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$

1 Dry weight + moisture regain; high ranking = low weight.
2 Strength retention after high-heat exposure.
3 Long-term strength and abrasion characteristics.
4 Sheds liquids, soils, and/or ice.
5 Resists change from UV, laundering, heat, and abrasion.
 
 
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