Porous Structures Technical Data


Maryland Ceramic & Steatite Brand Porous Structures are porous engineering materials consisting of tiny, precisely-sized spherical particles bonded together to form rigid three-dimensional shapes having an evenly distributed network of interstitial pores which are of uniform size, completely open and interconnected. Porous structures are manufactured using a patented process, which permits the exact reproduction of specified pore size, pore distribution and physical dimensions, regardless of quantity ordered over time.


Maryland Ceramic & Steatite Brand Porous Structures are ideally suited for a wide variety of applications involving filtration, aeration, oxygenation and fluidization — to name a few. They are intended for use wherever high rates of gas transfer into liquids, low back pressure, precisely controlled/evenly distributed flow rates or other desirable performance characteristics of uniform porosity are required.


Maryland Ceramic & Steatite Brand Porous Structures are available in flat sheets, hollow tubes, solid rods and an almost limitless variety of simple or complex/compound custom molded shapes to meet your design specifications. The following standard grades are normally stocked. Grade designations used to identify Maryland Ceramic & Steatite Brand Porous Structures also denote the maximum interstitial pore diameter in microns (ASTM 128-61). Coarser and finer grades available upon request from Maryland Ceramic & Steatite.




 (Product I.D. No.)   Description
15 Very Fine
40 Fine
55 Intermediate
90 Coarse
175 Very Coarse


A. Particle Retention (as filter medium)


Grade Absolute Nominal
15 15 8
40 40 20
55 55 28
90 90 45
175 175 90


B. Flexural Strength — (ASTM D-790)

From 1,500 to 4,500 psi depending upon Grade.

C. Compressive Strength — (ASTM D-695)

From 3,000 to 9,000 psi depending upon Grade.

D. Void Volume — 30%

E. Heat Resistance

250°F Continuous, 450°F Maximum (May be Autoclaved)

F. Coefficient of Thermal Expansion

10.8 x 10-6 in./in.°C from 0-400°F

G. Dielectric Strength

From 49 V/mil to 73 V/mil depending upon Grade.

H. Bulk Density — (ASTM C-20-73)

1.6 grams/cc

I. Chemical Resistance

No effect after 2 years immersion at 73°F in a wide variety of solutions.