Bullet-proof vests fibres

Preferred orientation in polymers (see Sect. 1.6.1) can deliver enhanced mechanical properties, especially when the level of preferred orientation is high. Most familiar to many is the case of nylon rope. Polyethylene is another material where very high strength fibres have been used to make ropes and bullet-proof vests. Two kinds of these are commercially available, namely Dyneema from DSM and Spectra from Honeywell. 

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