31. For specialized polyester-based materials the recycling process is significantly different. 32. Care should be taken to avoid melting excessive base material . 33. Mats are, with very few exceptions, made of paper-based material . 34. Care must be taken to ensure the base material is not gouged or distorted. 35. The floating screed was supported by runners that travelled on the prepared base material . 36. Old asphalt and base materials are pulverized using a specialized machine called a reclaimer. 37. Sintered ultra high molecular weight polyethylene materials are used as ski and snowboard base materials . 38. The shortest wavelength lasers rely on gallium nitride-based materials . 39. Caliche is widely used as a base material when it is locally available and cheap. 40. Once petroleum costs go up, the value of the bio-based material will become more competitive.
