Frequency change for NWE Butadiene weekly averages to launch July 16

The following weekly butadiene assessments will be published daily from July 16, 2012.

The assessments were initially set to be launched on July 2, 2012, but have been delayed.

NWE butadiene weekly averages of daily assessments will also be introduced effective from that date.

These assessments will be published up to two decimal places and can be found in Petrochemical Alert and OlefinScan.

All changes are effective as of July 2, 2012,

For further questions and queries please contact petchems@platts.com.