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.
HDPE pipeâs typical operating temperature range is from -40 oF (-40 0C) to. 140 oF (60 oC) although some products may be pressure rated for service as high as 180 oF (82 oC). Since. water freezes below 32 oF (0 0C) the practical lower temperature limit for water is 32 oF (0 oC).