All the values on this page are for comparison. There are variations between different manufacturing processes, alloys, spiders and wood samples.
Aramid fibres have remarkable strength to weight ratio when compared to other commercial fibres. Aramid fibre exhibits similar tensile strength to glass fibre, but can be twice as stiff. Aramid is very tough showing significant energy absorption but compared to carbon fiber, it is lower in compressive strength and has poorer adhesion to the matrix. It is also susceptible to moisture absorption.
Kevlar is subject to stress rupture. This is the sudden failure in a material held for long periods of time under loads which are sometimes considerably less than the tensile strength of the material.
Although Aramid is very strong, a sudden impact can seriously damage it. Climbers who tried Kevlar ropes learned that a rope that had been subject to a serious shock needed to be replaced since it could not be relied upon to retain its strength. It is not subject to creep as UHMWPE does.