Resins Used for Rotational Molding

Polyethylene is, by fer, the most commonly used resin in rotational molding processes. Low density, high density, and linear low density polyethylene are all used extensively. Additionally, crosslinked polyethylene is used for parts that require high chemical or heat resistance or enhanced impact resistance. 

Polyvinyl chloride is also widely used. Rigid polyvinyl chloride is introduced to the mold in powder form. The material is chosen for durable constructions because of its chemical resistance and ease of processing. It incorporates functional additives and demolds easily. Plasticized polyvinyl chloride can be used to produce flexible parts such as balls and soft toy parts. The polyvinyl chloride is introduced to the mold as either a plastisol or powder. A plastisol is a suspension of granules in a plasticizing agent When heated, the polymer granules absorb the plasticizer and fuse to form a cohesive, flexible material. 

---

Rotational molding is a reasonably safe industry. Most resins used are nonhaz-ardous. Some resins may cause mild irritation suppliers provide safety information on their handling and use. Most resins used for rotational molding are ground to 500 /xm (35 mesh), and appropriate procedures should be followed to prevent a dust explosion and fire. A rotomolder is a relatively safe piece of processing equipment fans are enclosed with guards spindles and arms operate at a low speed. The oven is equipped with a temperature control. 

---