The materials used in this processing method are generally pulverized into powders, which are melted and flowed in a thermal cycle. Rotomolding uses two types of PE: general-purpose and cross-linkable. General-purpose MDPE/HDPE usually has a density ranging from 0.935 to 0.945g/CC, with a narrow MWD, which enables the product to have high impact and minimal warpage. Its melt index is generally in the range of 3-8. Higher MI grades are generally not suitable because they do not have the impact and environmental stress crack resistance expected of rotomolded products. High-performance rotational molding applications utilize the unique properties of its chemically crosslinkable grades. These grades have good fluidity in the first part of the molding cycle, and then crosslink to form their excellent environmental stress crack resistance and toughness. Wear resistance and weather resistance.
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