Sink Float® 7.01 - 7.50 gm/cc, Density Standard

Sink-Float Standards are weighted, hermetically sealed, amber glass capsules for visually measuring and monitoring the density of liquids. Each Sink-Float Standard is precisely calibrated at 23°C (73.4°F) to measure a specific density of a liquid within a 0.7 gm/cc to 7.50 gm/cc range. The Standards are in 1/4″ (6.4 mm) in diameter and usually 3/4″ (19 mm) in length; for higher densities, the lengths may be longer. Each Sink-Float Standard is also permanently marked for identification.

Density is determined by simply observing the position of a Sink-Float Standard in a liquid. When a Sink-Float is swirled in a liquid and thoroughly wet, it will either float in a more dense medium, sink in a less dense medium or stay suspended when the densities match. Continuous monitoring of liquid densities is performed by keeping a Sink-Float in the liquid. Since a Sink-Float will have a normal position (up, down or suspended), any change of position will signal a change in density.

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