Rope makers all have different names, usually trademarked, for line made using these fibers, some of which are coming up here. All are used to make rope and other materials, including bullet-proof vests. These continuous fibers often are called HMWPE (high molecular weight polyethylene) or UHMWPE (ultra high molecular weight polyethylene). Vectran is owned by Celanese, Kevlar by DuPont, Technora by a Japanese company called Teijin Ltd., Dyneema by a Dutch firm, etc. Some of them are Vectran, Kevlar, Twaron, Technora, Dyneema, and Zylon.
There are other such fibers with somewhat different specific gravities, breaking strengths, modulus, elongation, and abrasion resistance. Spectra is a very fancy, fine filament fiber that other companies use to make line (and other things). It’s a trade name for a gel extrusion fiber owned by Honeywell, which bought Spectra from the original developer, Allied Signal. Pulse comes only in five sizes, from 1/16″ to 3/16″. He said the Pulse, with enough loops to equal the strength of the wire lifeline, lasts a long time. Nick tensions the ends of Calypso’s lifelines with Yale Cordage’s Pulse, a small-diameter braid with a Spectra core and Dacron cover. In your September issue, Nick Nicholson discusses the merits of bare wire lifelines and makes some very good points.He also speaks of tensioning with Spectra instead of turnbuckles, which I like.What are your thoughts on using Spectra in place of wire for the lifeline itself? It would be relatively easy to splice eyes on the ends then lash it to the correct tension.
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