Standard · Surface preparation and conditions
ASTM D7393
The vial test for oil in blast abrasives.
ASTM D7393 is the vial test: a quick check for oil in new or recycled blast abrasive. Oil on the abrasive ends up on the blasted steel and can cause poor adhesion and film defects such as fisheyes.
The procedure
Half fill a clean, clear, sealable container with abrasive. Add clean water to a level above the abrasive, close it and shake it hard for about a minute. Let it stand, then look at the water surface. Any oil sheen or droplets reject the abrasive.
A point exams like
The vial test and the conductivity test are separate tests. The water of the vial test is not used for the conductivity test of ASTM D4940, which needs its own sample and purer water.
4 practice items in the members area mention ASTM D7393 (CIP 1: 2 · CIP 2: 2).
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This page describes the subject of ASTM D7393 in our own words; it does not reproduce the standard. For the full text, buy the current edition from ASTM International. Checked on 2026-10-14; errors go in the corrections log. CoatMentor is an independent study aid. It is not affiliated with ISO, AMPP, SSPC, NACE International, ASTM or FROSIO.