Centro utilizes a wide variety of materials in the rotational molding process.
Our expertise in rotomolding the challenging cross-linked polyethylene and nylon materials is widely known in the industry. We have a wide selection of material options that we use in rotationally molded products. These material options include:

Cross-linked Polyethylene (XLPE)

This is a thermoset polymer used extensively in fuel tank applications and is known for it's durability and excellent impact resistance in cold environments.

Linear Polyethylene (LLDPE, MDPE, and HDPE)

This is a thermoplastic polymer of varying densities used in many applications including cab console and duct components, hoods, roofs and many other applications.

Nylon (PA 6, PA 11, PA 12)

Nylon 6, 11, 12: Frequently selected for applications that require high temperature resistance or low fuel permeation. Nylon materials are also paintable.

Liquid Nylon (RAP)

The production of the liquid nylon occurs during the rotomolding process. This material is extensively used for parts that require a high level of design freedom, must be paintable or require significant metal component encapsulation.


A proprietary, patent-pending solution (material and process) developed by Centro specifically for fuel tanks to comply with the regulatory fuel permeation requirements. RotoLoPerm® is compliant with CARB and EPA regulations for evaporative emissions. RotoLoPerm® is a multi-layer solution that combines the reliability and performance of cross-linked polyethylene with a barrier layer for control of hydrocarbon (VOC) emission.

Multi-layer structure

Multilayer structures are very useful in enhancing the performance of various products. Some of these enhancements include:
  • Hydrocarbon permeation reduction
  • Structural improvements
  • Noise reduction
  • Insulation
Centro's rotational molding technologies can provide the following multi-layer structures:
  • Cross-link polyethylene / EVOH / Cross-link polyethylene (RotoLoPerm)
  • Cross-link polyethylene / nylon
  • Linear low density polyethylene / In-mold foam
  • Linear low density polyethylene / post molding foam

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