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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 21 (1937)

Issue: 2. (February)

First Page: 259

Last Page: 267

Title: Method of Impregnating Porous Materials to Facilitate Pore Studies

Author(s): Allen W. Waldo (2), S. T. Yuster (2)


An efficient method for the impregnation of porous materials, particularly of low permeabilities, for the purpose of studying the pore system is described. A brief review of previous methods is given, as well as a description of the proposed method and apparatus.

In brief, the method consists of evacuating the air from a clean, dry specimen at room temperature, immersing it in molten balsam, to which an oil-soluble dye has been added, and then forcing that balsam into the evacuated pores under pressure.

The equipment is very simple and inexpensive. It requires only an air-tight cylinder, a means of evacuating it, a method of later applying pressure within it, and a heating unit which will melt the balsam at the proper time.

The pores, as they appear in the resulting sections, are impregnated with the brilliantly dyed balsam, so that a complete study of their size, shape, number, interconnections, and distribution is possible.

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