Prices in the $2.8 trillion global petrochemicals business continued to forge ahead in March hitting new six-month highs and continuing to build on the dramatic gains seen in January when the Platts Global Petrochemical Index (PGPI) rose 10.4%. The index, a basket of the most widely-used petrochemicals prices expressed in dollars per metric ton ($/mt), advanced 0.7% in February and rose again in March to close the month at $1,233/mt, compared to $1,192/mt at the end of February, Platts reports.