Liquid
Liquid means a substance or mixture which at 122 F (50 C) has a vapor pressure of not more than 43.51 PSI (300 kPa (3 bar)), which is not completely gaseous at 68 F (20 C) and at a standard pressure of 101.3 kPa, and which has a melting point or initial melting point of 68 F (20 C) or less at a standard pressure of 14.69 PSI (101.3 kPa). Either ASTM D4359-90 (R2019) (incorporated by reference, see 1910.6); or the test for determining fluidity (penetrometer test) prescribed in section 2.3.4 of ADR 2019 (incorporated by reference, see 1910.6) can establish whether a viscous substance or mixture is a liquid if a specific melting point cannot be determined.