Polyethylene for rotomoulding
Polyethylene is the common material used for rotomoulding. It is a thermoplastic polymer that is widely used in rotomoulding due to its cost, high flexibility, and excellent resistance to impact and chemicals. Polyethylene is also referred to as polyethene and abbreviated PE, or more specific for rotomoulding: linear low density or LLDPE.
This material is available in various densities, often referred to as LDPE, MDPE and HDPE: for low, medium and high densities. It can be used to create parts with high strength and high toughness even at low temperatures. Polyethylene is ideal to create parts that need to be tough and durable, such as tanks, containers, and pallets.
Polyethylene for rotomoulding is becoming available as bio-based material. This renewable material is made from feedstocks such as corn starch, sugarcane, and hemp. It can be used to create parts with similar properties to those made from traditional polyethylene.
Materials that withstand the heat
Polypropylene is another thermoplastic polymer used in rotomoulding. This material is known for its high stiffness and high strength, also at higher temperatures. It is also lightweight and has a high melting point. Polypropylene is used to create parts such as pipes, ducts, and tanks.
If the requirements for properties on temperature, mechanical performance et cetera increase, we can apply an engineering plastic. Most common engineering plastic for rotomoulding is nylon, as PA6 or PA11 or PA12. Nylon is a very suitable material for hydraulic oil tanks. The cooler tank for hydraulic oil may be pressurized while the oil has a temperature of 135 °C. The processability of PA6 is more complex, whereas PA11 and PA12 are comparable to the production of PE or PP. Other engineering plastics that can be used in rotomoulding include ABS, POM and polycarbonate (PC).
Foam for stiffness and lightweight
Rotomoulded products with foam are stiff and lightweighthollow products that are foam-filled. Both PE foam and PUR foam can be used in rotomoulding products. Both materials are lightweight, making them ideal for creating parts that need to be lightweight but also stiff and strong. They also have excellent insulation properties, making them ideal for creating parts that need to keep things cool or warm even in harsh environments. After producing an outer layer of PE, the PE foam is added during the sintering process. Alternatively, after cooling, PUR foam can be injected inside the hollow part. Both processes create products with a solid PE skin and a PE foam core.