While ASTM D95 is a reliable standard, it does have specific limitations:
Achieving repeatable results requires precise adherence to the apparatus specifications outlined in the official ASTM D95 PDF document. 1. Distillation Flask
✅ – labs accredited to ISO 17025 must use the official current version of ASTM D95.
A specialized glass trap (often a Dean-Stark apparatus) graduated from 0 to 2 mL, 5 mL, 10 mL, or 25 mL, depending on the expected water content. Astm D95 Pdf
The condensed liquids drop into a graduated glass trap. Because water has a higher density than the solvent, it sinks to the bottom of the trap. The lighter solvent overflows back into the distillation flask.
The solvent and water co-distill and then separate in a graduated glass trap. The water, being denser, settles at the bottom.
Buyers and sellers use water content data to correct the gross volume of oil transferred, ensuring payments are only made for the actual hydrocarbon volume. 2. Principle of the Test Method While ASTM D95 is a reliable standard, it
What you are testing (crude oil, asphalt, or lubricants?) What estimated water percentage you expect?
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A solvent blank must be performed by distilling an equivalent amount of the same solvent used for the test sample. The blank measurement is then used to correct the final water volume. [25†L222-L224] A specialized glass trap (often a Dean-Stark apparatus)
The ASTM D95 apparatus consists of three main components: [23†L2-L13]
Following the exact sequence ensures repeatable and reproducible results. Step 1: Sample Preparation Thoroughly mix the laboratory sample to ensure homogeneity.
Water can poison catalysts and cause pressure spikes in refinery units. Testing via ASTM D95 helps engineers manage these risks before processing. ASTM D 95 - water content of petroleum products - Normalab
The vapors rise into a reflux condenser, where they turn back into liquid and drip into a graduated trap. Separation: