Usually made of high molecular weight high density polyethylene (HMWHDPE), with a content of ≥ 95%. This material has the characteristics of corrosion resistance, frost resistance, oxidation resistance and UV resistance, and is not eroded by seawater, chemicals, oil stains and aquatic organisms.
Some buoys will use polyurethane foam, cross-linked copolymer foam or composite foam materials, etc., to meet different application requirements.