ASTM D4306 practice for aviation fuel sample containers for tests
ASTM D4306 standard practice for aviation fuel sample containers for tests affected by trace contamination
4. Apparatus
4.1 Sampling Containers:
4.1.1 Epoxy-Coated Containers:
4.1.1.1 While generally superior to other coatings, certain epoxy-coatings evolve plasticizers which can adversely affect critical fuel properties. Because no specification is known to describe a satisfactory epoxy-coating, 6.2 lists an approval procedure which can be used to identify a satisfactory coating.
4.1.1.2 For initial qualification of new container sources, coated cans should be examined closely to assure that the coating covers all inside surfaces. If not, the cans should be considered the same as tin-plated, soldered side seam cans.
4.1.1.3 Epoxy-coated cans are generally considered satisfactory for sampling aviation gasoline.
4.1.2 Borosilicate (Hard) Glass Bottles - Amber colored or bottles covered with an opaque material such as aluminum foil are preferred to avoid possible reactions with sunlight.
4.1.3 Polytetrafluoroethylene (PTFE) Bottles - Black, carbon-filled bottles avoid possible reactions with sunlight.
4.1.4 Polyethylene Bottles, high-density, linear.
4.1.5 Steel Cans, tin-plated, soldered side seam.
4.1.6 Soda Lime (Soft) Glass Bottles.
4.2 Closures:
4.2.1 Closures with a metallic inside surface are preferred. Closures with the same inside surfaces as suitable containers or PTFE are also suitable.
4.2.2 Where required by shipping regulations such as DOT 17C or 17E the closure should also include a metallic shipping seal.
NOTE 1 - The use of improper or uncleaned closures or shipping seals will destroy all precautions used in selecting and preparing containers. The use of properly selected and cleaned closures or seals is essential.
5. Reagents and Materials
5.1 Acetone, CP Grade (Warning - Extremely flammable. Vapors may cause flash fire). (See Note 2).
5.2 Toluene, CP Grade (Warning - Extremely flammable. Vapors may cause flash fire). (See Note 2). When used to clean containers for conductivity, measure toluene conductivity according to Test Method D2624 or D4308 and use only if conductivity is less than 20 pS/m.
5.3 Isopropanol, CP Grade (Warning - Extremely flammable. Vapors may cause flash fire). (See Note 2).
5.4 Heptane, CP Grade (Warning - Extremely flammable. Vapors may cause flash fire). (See Note 2).
NOTE 2 - Because these solvents are available at various purity levels, the use of CP grade is required to eliminates possible problems with residual impurities.
5.5 Detergent, heavy duty, water soluble, laboratory type.
5.6 Jet A or Jet A-1, used as reference fluid. (Warning - Combustible. Vapor harmful).
5.6.1 Reference fluid for approval testing with Jet A or Jet A-1 fuel is prepared in accordance with Test Method D3948, Appendix X1 on Preparation of Reference Fluid Base, and should have an electrical conductivity of 0.1 to 1.0 by Test Method D4308 (or give a reading of less than 1 according to Test Method D2624) and an MSEP rating of 98-100 by Test Method D3948.
5.6.2 Compressed Air, clean, dry, oil free and filtered, may be used to expedite air drying.
