Lot/Batch Numbering System

Procedures are established for assigning and applying standard lot numbers (also referred to as batch numbers) to all caustic soda solution produced in Dow’s Chlor-Alkali manufacturing facilities. Lot numbers are used to assure that individual production batches of material can be traced from the time of production through final sale to the customer. A typical lot number will provide information on the year, month, date (day of the month), geographic region, plant facility and specific storage tank of the lotted caustic soda solution.

Caustic Soda Batch Numbering System Codes

Year Code (Digit 1) is coded to the following sequence: T is used for 2005 U is used for 2006 V is used for 2007 W is used for 2008 X is used for 2009 Y is used for 2010

Month Code (Digit 2) is coded to the following sequence: A = January B = February C = March D = April > E = May F = June G = July H = August I = September J = October K = November L = December

Day of Month (Digits 3 and 4) are coded from 01-31

Dow Geographic Location (Digits 5 and 6) are coded by: 01 = Dow Chemical USA 02 = Dow Chemical Canada

Facility Location (Digits 7 and 8) XX = North American Facility Location

Specific Tank Code Number (Digits 9 and 10) YY = Specific Tank Code Number

Example A: UJ1901XXYY (2006, October 19: Dow Chemical USA) U = 2006 J = October 19 = 19th Day 01 = Dow Chemical USA XX = North American Facility Location YY = Specific Tank Code Number