The metal and aluminium coils in Litong products are made from the highest quality materials. We require our suppliers to adhere to the strictest standards and use a rigorous qualification process when selecting new sources. All of our metal roofing coils and sheets are produced from recycled materials, with at least 25% of the raw material coming from post-consumer or post-industrial waste. With our world class paint lines, we maintain fully integrated manufacturing capabilities to ensure the highest level of quality control. Stock strengths of various forms of aluminium range from specification 1100-0, which has a yield strength of approximately 5,000 psi, to specification 7075-T6, which has a yield strength of approximately 70,000 psi. (per square inch).