Principle of Measurement for Electronic Analytical Balances
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Aug 31,2026
The specific gravity measurement using an electronic analytical balance employs Archimedes’ displacement method, which is the most accurate and widely used technique for determining the density of solid materials in industrial testing. It is extensively applied to the physical‑property evaluation of products such as rubber, plastics, and polymeric materials. The principle of the test is as follows: a precision balance is used to measure the dry mass of the sample in air and its apparent mass when fully immersed in distilled water. By accounting for the difference between the displaced volume of the object and the buoyant force, the material’s true density is calculated with high accuracy.
The measurement procedure requires the use of a dedicated specific‑gravity stand and a weighing basket. The stand must be suspended above the balance’s frame, ensuring no contact with the weighing pan to prevent weighing errors. During testing, use room‑temperature distilled water, thoroughly removing any air bubbles from the sample surface to avoid underestimation of density caused by such bubbles. Additionally, ensure the sample is fully submerged and does not touch the walls or bottom of the beaker; record the reading only after the value has stabilized.
This testing method is easy to operate, highly accurate, and exhibits excellent reproducibility. It enables rapid determination of whether material ratios and filler content meet specified standards, making it a core analytical procedure for incoming raw material inspection, finished‑product quality control, and formulation validation. As such, it effectively ensures product property stability and production consistency.
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Aug 31,2026
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