TM 10-6640-238-13 E-1 APPENDIX E EXPENDABLE AND DURABLE SUPPLIES LIST Section I.  INTRODUCTION E-1. SCOPE. This appendix lists expendable and durable supplies you will need to operate and maintain the Petroleum Laboratory.  These items are authorized to you by CTA 50-970, Expendable Items. E-2. EXPLANATION OF COLUMNS. The following provides an explanation of columns found in the tabular listing: a. Column 1, Item Number.  This number is assigned to the entry in the listing and is referenced in the initial set-up to identify the material (e.g., “Cleaning compound, Item 5, Appendix E”). b. Column 2, Level.  This column identifies the lowest level of maintenance that requires the listed item: C Operator or Crew O Unit Maintenance F Direct Support Maintenance H General Support Maintenance c. Column 3, National Stock Number.  This is the national stock number assigned to the item; use it to request or requisition the item. d. Column 4, Description.  Indicates the Federal item name, and, if required, a description to identify the item. The last line for each item indicates the Commercial and Government Entity Code (CAGE) in parentheses followed by the part number. e. Column 5, Unit of Measure (U/M).  Indicates the measure used in performing the actual maintenance function. This measure is expressed by a two-character alphabetical abbreviation (e.g., EA, IN, PR).  If the unit of measure differs from the unit of issue, requisition the lowest unit of issue that will satisfy your requirements. E-3. SPECIAL CHEMICAL PROCURING INSTRUCTIONS. When procuring chemicals the specific material safety data sheets (MSDS) for each chemical is to be procured for that chemical and stored in the Lab Storage Requirement Book located in the Petroleum Laboratory bookcases.  When procuring chemicals always require that packaging for each chemical be department of transportation (DOT) certified for air, land, and sea transport.