Corma is a leader in the design and manufacture of Corrugated Plastic Pipe Production Systems and has over 46 years of experi ... ence in the industry. Corma has hundreds of patents worldwide in selected countries. Patented technology such as the Double Layer In-Line Coupling, Mold Block Inserts, Compact Die (for large diameter pipe), Vacuum Forming, Double Wall Pipe Systems and Super Cooling. These Corma technologies have advanced the corrugated double wall plastic pipe industry. Corma is the inventor of the single layer, as well as the double layer in-line coupling. Corma offers systems to produce pipes from 1 mm to 3000 mm in diameter. Pipes can be made of PVC, PE, PP, PA. Corma has plants in Concord, Ontario, Forest, Ontario and Shanghai, China and with sales and service offices in Germany, Slovakia and El Salvador. We provide services to our customers in over 90 countries worldwide. read more