Method to Calculate Density of Glass by Buoyancy ASTM C693

Method to Calculate Density of Glass by Buoyancy ASTM C693

The standard method ASTM C693 measures the density of glass. Measuring the thickness of the glass is very important as any change in the density can lead to undesired results. Density measurement also validates the purity of the raw material. Density is obtained in kg/m³ or g/cm³.


    Finding the density of glass by ASTM C693 is essential as it provides information about the mass and volume and shows how much pressure will be applied to the glass to displace it. Density data provide information about the purity of raw materials of glass and is different for various composites. It has several applications in development, construction, research, and production.

    Test Procedure:

    The mass of the given glass sample is measured on an electric balance, and the reading is recorded. The same sample is weighed two more times to reduce the experimental error as the average of the three values is taken as the mass value. To measure the volume of the given glass sample, it is carefully immersed in a solution/water, and the increase in the volume of the solution is noted. The initial volume is subtracted from the final volume, and the reading is used as the value of the glass volume.

    Specimen Size : 

    The sample size can vary from mg to kg.


    The formula to measure the density of glass; Density = mass/volume ρ=m/V… (1)

    For Mass:

    Mass of the glass (g)Reading 1Mass of the glass (g)Reading 2Mass of the glass(g)Reading 3Average (g)

    For Volume

    The volume of Water in cm3The volume of Water in cm3
    Without Glass cm3With glass cm3

    By‌ ‌putting‌ ‌values‌ ‌in‌ ‌equation‌ ‌(1),‌ ‌the‌ ‌value‌ ‌of‌ ‌density‌ ‌ρ=0.80/0.4=‌ ‌2g/cm‌3‌‌


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