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    Density and Specific Gravity

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    MATERIALS ARE EXCHANGED FOR AN AGREED upon value based upon a “cost per unit material.” The “unit of material” is in terms of what the user wants to do with the material expressed in physically measurable units such as volume or weight. The customer does not want to be shorted, and the provider does not want to give away material. Accurate measurements are expected to keep both parties happy. When a customer wants a gallon of paint, the manufacturer blends the component materials together by weight and fills out by weight. Balances are easy devices to place and use with filling lines. Delivery of constant volumes, on the other hand, is not an easy task, as will be explained later. Measurement of the weight of a known volume of the paint generates a relationship defined as density. With this relationship, the producer can fill by weight and then sell to the customer on a by-volume basis. The customer wants volume; the producer wants to work in weights. The relationship—density—enables the transformation to make life easier for both groups.

    Author Information:

    Brockhaus, Raymond D.
    E. I. Du Pont, Mt. Clemens, MI

    Carlozzo, Ben J.
    DCA Coatings, Cleveland, OH

    Committee/Subcommittee: D01.20

    DOI: 10.1520/MNL12214M