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: The condensed liquids fall into a graduated glass trap. Because water is heavier and immiscible with the solvent, it settles at the bottom of the trap while the excess solvent flows back into the flask.

The story of isn't just about a PDF; it's a technical narrative about why water is the "uninvited guest" in the world of oil and asphalt. Astm D95 Pdf

Water in lubricating oils can cause machinery to rust or fail. In hot bitumen, trapped water can turn into steam and cause dangerous "boilovers" during processing. The Scene: The "Dean-Stark" Distillation : The condensed liquids fall into a graduated glass trap

. It covers everything from measuring water in the range of 0% to 25% by volume. Official Source: You can purchase the current standard directly from ASTM International Reference Copies: Water in lubricating oils can cause machinery to

Unlike Karl Fischer titration (which detects ppm levels of water), ASTM D95 is designed for and relies on azeotropic distillation using a water-insoluble solvent.

ASTM D95 is periodically revised. As of 2025, the most current active version is (issued 2023). Key changes from older versions include:

Source: Journal of Used Oil Analysis, Volume 12, Issue 1