On 5/12/2019 10:17 AM, Steve Maki wrote:
Yale Cordage, in some of their high strength ropes, uses what they call
UHMWPE (Ultra High Molecular Weight Polyethylene), which they do NOT
identify as Dyneema. They have manufactured these ropes for a long
time...I'm guessing they make the fiber themselves, or they would call
it Dyneema.
Although Dymeema may be made from UHMWPE, it is considerably different
from run of the mil UHMWPE. UHMWPE has a coefficient of thermal
expansion (CTE) of 220 ppm, and machines easily. Dyneema has a NEGATIVE
CTE (very rare), and is very difficult to machine. These
characteristics don't necessarily translate to good rope, but they
at least differentiate it from ordinary UHMWPE.
Rick N6RK
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