What are PMI Porometers?
A Porometer is capable of measuring the diameter of a pore at its most constricted part, the largest pore diameter, the mean pore diameter, the pore distribution, and gas permeability in a porous material. The pores in the sample are spontaneously filled with a wetting liquid. Pressure of a nonreacting gas on one side of the sample is slowly increased to remove liquid from pores and permit gas flow through the pores. Measured differential pressures and flow rates of gas through wet and dry conditions of the sample are used to compute pore structure characteristics. Sophisticated design and instrumentation leads to high accuracy and reproducibility of results.
Products in the porometer line are designed to perform a variety of tasks. The pore structures in the thickness direction (z-direction) and in the in-plane directions (x & y) can be determined. Many sample shapes and sizes can be accommodated. Tests can be performed without cutting any sample from the product. Effects of compressive stress, cyclic compressive stress, temperature and chemical environment on pore structure can be determined. Some of the additional features that can be added to a porometer are multiple sample chambers, generation of fast and reproducible data, multiple test options, liquid permeability, and predefined product selection criteria.
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