1 Scope
This Standard specifies two methods of test for the determination of the density of solid vulcanized and thermoplastic rubbers.
This Standard is applicable to the control of the quality of a rubber compound and in the calculation of the mass of rubber required to produce a given volume of material.
This Standard does not cover the determination of the relative density of rubber, which is the ratio of the mass of a given volume of rubber to the mass of an equal volume of pure water at a given temperature.
2 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
2.1
Density
Mass of unit volume of the rubber at a stated temperature. It is expressed in megagrams per cubic metre (mg/m3).
3 Principle
Two methods, A and B, are given in this Standard.
In method A, the mass of the test piece and the mass of water equal in volume to the volume of the test piece are determined using a balance equipped with a pan straddle. The apparent mass of the test piece when immersed in water is less than that in air by the mass of water displaced, the volume of water displaced being equal to that of the test piece.
Method B is intended to be used only when it is necessary to cut up the test piece into small pieces to eliminate air spaces, as in the case of narrow-bore tubing and electric-cable insulation. Measurements are made using a balance and a density bottle.
Note: For convenience, all gravity in this Standard are expressed in mass unit.
