Understanding creep on UHMWPE
Synthetic fibers will elongate when loaded over longer periods of time. This phenomenon is known as creep. Creep is an irreversible process in which the long molecular chains slide along each other.
UHMWPE fibers creep is influenced by the ambient temperature, the applied load and the time.
Reading the graphic: in general more black dots are more creep and higher risk of breaks.
applied to bowstrings :