Rotomolding - Rotational Molding - NW Plastics, BC, Canada, ISO 9001 For 40 years Canada and the United States have turned to Northwest Plastics for all their Rotational Molding Needs. See our ISO 9001 Certified plant. For 40 years Canada and the United States have turned to Northwest Plastics for all their Rotational Molding Needs. See our ISO 9001 Certified plant.