Rotational Molding Materials
The most common materials include: LLDPE, HDPE, XLPE, and Nylon. There are also engineered resins such as PVC, PP, Polycarbonate, Acetal, and CBT materials available.
Linear Low Density Polyethylene, High Density Polyethylene, and Polypropylene are all Polyolefins – Polyolefins are the largest group of thermoplastics and are often referred to as commodity resins. The term “polyolefin” means "oil-like" and refers to the oily or waxy feel that these materials have. The two most common polyolefin’s are polyethylene and polypropylene. They are very popular, because of their low cost and wide range of applications. Some applications include, seed hoppers, water containers, covers, and tanks. LLDPE and HDPE are more commonly used in rotational molding then Polypropylene.
There are many different grades of nylon used in rotational molding such as: Nylon 6, Nylon 11, and Nylon 12. Each grade has advantages for specific application requirements. All nylons have excellent tensile strength, good chemical resistance, stiffness, abrasion resistance, and excellent heat resistance ranging from 200-300 degrees F. Typical applications include: fuel tanks, hydraulic reservoirs, automotive components, and products that require high heat resistance.
Cross-Linked Polyethylene is a thermo-set polymer that contains a reacting agent that forms cross-linked polymers during the molding cycle. This reaction improves ESCR (Environmental Stress Crack Resistance), toughness, and product stability. Applications include fuel tanks, blower housings, hydraulic reservoirs, pulley covers, and chain guards.
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