▎ 摘　　要

NOVELTY - A plastic tube (1) comprises 20-90 wt.% graphite or boron nitride or graphene or carbon nanotube filler material comprising mixture of powder (p1) and 0-50 wt.% powder (p2) based on total mass of graphite or boron nitride or graphene or carbon nanotube filler material. The plastic tube has tube walls having outer surface (2). The powder (p1) comprises 50% or more platelets and strands or fibers in a region (4) with a distance of at least 0.1 mm from tube wall surfaces which are oriented in longitudinal direction of plastic tube of 45-90 degrees . USE - Plastic tube is used as heat exchanger tube used in water desalination apparatus (all claimed), power stations, refrigerating device and combustion engines. ADVANTAGE - The plastic tube has excellent long term vibration stability and surface wettability. DETAILED DESCRIPTION - A plastic tube comprises 20-90 wt.% graphite or boron nitride or graphene or carbon nanotube filler material comprising mixture of powder (p1) and 0-50 wt.% powder (p2) based on total mass of graphite or boron nitride or graphene or carbon nanotube filler material. The plastic tube has tube walls having outer surface which is surface activated by increasing surface energy using flame treatment. The tube wall has a thickness of 0.75 mm or more. The powder (p1) comprises 50% or more platelets and strands or fibers in a region with a distance of at least 0.1 mm from tube wall surfaces which are oriented in longitudinal direction of plastic tube of 45-90 degrees . The powder (p2) comprises spherical particles. An INDEPENDENT CLAIM is included for manufacture of plastic tube. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of plastic tube. Plastic tube (1) Outer surface (2) Inner surface (3) Region (4) Surface activated layer (5)