Dyneema Spectra and oriented polymers Dyneema and Spectra are described here as I d always understood them to be as oriented strand This is how how they develop their remarkable strength and why it s only the case for spun fibres rather than bulk materials However the rest of the section then discusses UHMWPE fibers with no distinction being made Are all UHMW spun fibres oriented like this and thus equally strong Or are there generic fibres and oriented fibres of different strengths