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Plastics Materials
Sep 19, 2017

More than 80% of all the material used is from the polyethylene family: cross-linked polyethylene (PEX), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), and regrind. Other compounds are PVC plastisols, nylons, and polypropylene.

Order of materials most commonly used by industry:[8]

These materials are also occasionally used (not in order of most used):[8]

Natural materials[edit]

Recently it has become possible to use natural materials in the molding process. Through the use of real sands and stone chip, sandstone composite can be created which is 80% natural non-processed material.

Rotational molding of plaster is used to produce hollow statuettes.

Chocolate is rotationally molded to form hollow treats.


Designers can select the best material for their application, including materials that meet U.S. Food and Drug Administration (FDA) requirements. Additives for weather resistance, flame retardation, or static elimination can be incorporated. Inserts, graphics, threads, handles, minor undercuts, flat surfaces without draft angles, or fine surface detail can be part of the design. Designs can also be multi-wall, either hollow or foam filled.

Products that can be manufactured using rotational molding include storage tanks, furniture, road signs and bollards, planters, pet houses, toys, bins and refuse containers, doll parts, road cones, footballs, helmets, canoes, rowing boats, kayak hulls and playground slides. The process is also used to make highly specialised products, including UN-approved containers for the transportation of nuclear fissile materials,[9] anti-piracy ship protectors,[10] seals for inflatable oxygen masks[11]and lightweight components for the aerospace industry.[12]