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Bert,
Dyneema and spectra are trade names for high modulus polyethylene(HMPE). So the spectra is polyethylene but different than the poyethylene you would find in roto-molded products like a kayak etc. The difference lays in a linearization of the polymerization process which allows each strand to align in a common direction which increases the modulus(strength) over conventional polyethylene.
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