Synopsis. Richard Petty was born on July 2, 1937 in Level Cross, North Carolina. Following in his father Lee Petty's footsteps, Richard began professional car racing in 1958. During his career he was nicknamed The King for winning the Daytona 500 and the NASCAR national championship each seven times during 1964â1981.In all, Petty accumulated 200 victories before retiring in 1992.ollowing in his father Lee Petty's footsteps, Richard began professional car racing in 1958. During his career he was nicknamed The King for winning the Daytona 500 and the NASCAR national championship each seven times during 1964â1981. In all, Petty accumulated 200 victories before retiring in 1992.
Medium-density polyethylene (MDPE) is a type of polyethylene defined by a density range of 0.926â0.940 g/cm 3.It is less dense than HDPE, which is more common. MDPE can be produced by chromium/silica catalysts, Ziegler-Natta catalysts or metallocene catalysts. MDPE has good shock and drop resistance properties.. Medium-density polyethylene (MDPE) is a type of polyethylene defined by a density range of 0.926â0.940 g/cm 3. It is less dense than HDPE, which is more common. MDPE can be produced by chromium/silica catalysts, Ziegler-Natta catalysts or metallocene catalysts.
It is sometimes called alkathene or polythene when used for pipes. With a high strength-to-density ratio, HDPE is used in the production of plastic bottles, corrosion-resistant piping, geomembranes, and plastic lumber.HDPE is commonly recycled, and has the number 2 as its resin identification code (formerly known as recycling symbol).t is sometimes called alkathene or polythene when used for pipes. With a high strength-to-density ratio, HDPE is used in the production of plastic bottles, corrosion-resistant piping, geomembranes, and plastic lumber.