Density - ASTM D1505 Plastic Test Standard

Density - ASTM D1505

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Density is the mass of a material per unit volume.

In this method the density of a material is determined by the density-gradient technique. A material is placed in a liquid column of variable density with standard floats (glass beads of known density). The material must float between a pair of the floats. The density of the material is then calculated based on its position in the column and the densities of the glass beads.

Density Gradient Column

The formula used to calculate density is:
Density = D_a + [(h - h_a)(D_b - D_a)/(h_b - h_a)]
where D_a and D_b are the densities of floats a and b,
h is the vertical position of the material (measured from an arbitrary datum),
and h_a and h_b are the vertical position of floats a and b.

Density can be converted to specific gravity by dividing the density (in g/cm³) by 0.9975.

Similar Standards

• ASTM D792
• ASTM D4883
• ISO 1183

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