The measurement of film thickness and of solvent action on supported films

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Publication Type:

Journal Article

Authors:

Stolow, Nathan;

Source:

Studies in conservation, Volume 3, Number 1, p.40-44 (1957)

Keywords:

action, drying, England, England (London), Europe, film, oils, solvents, thickness, UK

Abstract:

Two manometric instruments for the rapid measurement of the thickness of paint and varnish films are described. In the first the probe is a jet of nitrogen emerging from a hypodermic needle which is attached to the focusing movement of a microscope from which the optical parts have been removed. In the second, the needle is replaced by a flat plate pierced by an orifice fed with a solvent, the action of which on the film is measured. The approach of the probe in both cases imposes a back pressure on the gas or solvent flow which makes possible location, and by a calibration, thicknesses are read on the micrometer movement of the microscope. Thus rates of swelling and des welling can be determined. Examples of results published in detail elsewhere are given.