High strength in a long length for fibers coated at a speed of 5 m/s

We report the first results of high-strength fibers in long lengths (>5 km) coated at a speed of 5 m/s. A total length of 50.8 km of fiber in sample lengths ranging from ∼ 5 to ∼ 7 km was prooftested at three different stress levels up to 2.1 GN/m
²
. It is found that the average survival length at two prooftest levels of 1.4 GN/m
²
(200 kg/in
²
) and 2.1 GN/m
²
(300 kg/in
²
) are, respectively, ∼10 and 3 km.