ASTM D4742 Test Method for Oxidation Stability of Gasoline Automotive Engine Oils
ASTM D4742 Standard Test Method for Oxidation Stability of Gasoline Automotive Engine Oils by Thin-Film Oxygen Uptake (TFOUT)
9. Preparation of Apparatus
9.1 Glass Sample Container - Rinse the glass sample container with n-hexane. Clean the glass container with hot detergent solution and water. Rinse the container with acetone. Blow the container dry with clean compressed air.

NOTE 14 - A clean glass sample container is important for obtaining repeatable results. Thorough cleaning of the glass sample can be accomplished by (a) hexane rinse, (b) acetone soak for 15 min, (c) hot detergent solution and water soak for 4 h, (d) acetone rinse, and (e) hexane rinse. A clean glass sample container is important for obtaining repeatable results.

NOTE 15 - A segmented glass sample container has been found suitable to prevent premature mixing of the catalyst components.

9.2 Cleaning of High Pressure Reactor - Wash the inside of the high pressure reactor, aluminum insert, lid, and inside with hot detergent solution and water. Rinse the inside of the stem with isopropyl alcohol and blow dry with clean compressed air. If the high pressure reactor, insert, lid, or inside of the stem emits acidic odor after simple cleaning, wash with 1.5 % alcoholic potassium hydroxide (KOH) solution, and repeat the cleaning procedures.

9.3 Cleaning of High Pressure Reactor Stem - It is recommended to periodically disassemble, inspect, and clean the high pressure reactor stem. Rinse the inside of the stem with isopropyl alcohol and blow dry with clean compressed air. After cleansing, it is recommended to insert a dry pipe cleaner into the transducer line opening for removal of potential residue buildup.

NOTE 16 - It is recommended to replace the O-rings when reassembling the pressure transducers.

9.4 To obtain a representative sample of stocks of uniform petroleum products, follow Practice D4057.

9.5 Cleaning of Catalyst Syringes - Individual catalyst syringes are to be used for each catalyst component. They are to be thoroughly cleaned and dried prior to each use. (See Annex A4 for recommended procedure.)