ASTM D7150 for Determination of Gassing Characteristics of Insulating Liquids
ASTM D7150 Standard Test Method for the Determination of Gassing Characteristics of Insulating Liquids Under Thermal Stress at Low Temperature
6. Reagents and Materials
6.1 Mixed Cellulose Ester Membrane Filter, consisting of either 1 or 1.2 µm pore size, of correct diameter to fit in the filtering apparatus listed in 6.2.
6.2 Vacuum Filtering Apparatus, consisting of funnel reservoir (250 mL or larger), clamp, base, stopper and receiving flask. The 47 mm size is the type most often used.
6.3 Dry Nitrogen, meeting the requirements of Specification D1933, Type III with the following exception: the total hydrocarbon content must be <0.5 ppm. This type of gas is sometimes referred to as Ultra-High Purity (UHP).
6.4 Dry Air, meeting the following requirements: 20 to 22 % oxygen, <3 ppm water, and <1 ppm total hydrocarbons. This type of gas is sometimes referred to as Zero Grade.
6.5 Ovens, forced-draft, adjustable to 120 ± 2°C and a drying oven, convection or forced-draft, or both, adjustable to 100 ± 5°C.
6.6 Syringes, glass, either 30 or 50 mL, either matched plunger and barrel or precision ground to 0.006 ± 0.001 mm maximum spacing between the inside of the barrel to the outside of the plunger for both the 30 mL and 50 mL syringes.
6.7 Female-Luer-to-Closed-End-Adapter, nickel-plated brass.
6.8 Attapulgite Clay (Fuller's Earth), virgin material sized at 30/60 mesh.
