Under a scanning electron microscope, CoralPor® porous glasses resemble the structure of their namesake, coral skeletons. At high magnification, countless pores and channels are revealed. In comparison to other porous materials, the key advantages of porous glasses are found in their high chemical, thermal, and mechanical resistance that give them an extremely rigid and incompressible structure. SCHOTT offers nano-porous and macro-porous glasses that have fundamentally different properties, production processes, and applications. What they both have in common is an open porosity that is created through tightly controlled thermal and chemical treatment.

Core technical features of porous glass

Durably robust

The inorganic nature of glass provides porous glasses with high mechanical, thermal, and chemical resistance, making them a more robust option in comparison to inorganic polymer solutions.

Tight control over porosity

The structure can be modeled over a broad scale to have a defined pore size, pore volume, and pore size/diameter distribution.

Variety of shapes and formats

CoralPor® Nano-Porous glasses are offered as powders or larger monolithic pieces in rod, plate, and pipe formats. CoralPor® Macro-Porous glasses are available as granulates and monolithic parts.

Adaptable material

In addition to porosity and shape, further parameters of Macro-Porous glasses that can be influenced through manufacturing and coating processes include glass composition, density, refractive index, CTE, and color.

Nano- or Macro-Porous?

SCHOTT offers two porous materials for the nanometer- and micrometer-porous range, with the right pore size for every purpose. Typical application examples for different pore size ranges are shown in the graphic below.

Graphic showing typical application examples for different pore size ranges of porous glasses

CoralPor® Nano-Porous Glasses

Technical Data

Technical Data of CoralPor® Nano-Porous Glasses CoralPor® Nano-Porous Monoliths CoralPor® Nano-Porous Powder
Shape Rods, Discs, Plates Powder
Average pore diameter 4 – 10 nm  4 – 400 nm
Specific surface area 100 – 170 m2/g  7 – 130 m2/g
Specific pore volume 0.2 – 0.3 cm3/g 0.4 – 2 cm3/g


Typical Pore Size Distribution

Graph showing the typical pore size distribution of CoralPor® Nano-Porous glass monoliths

Graph showing the typical pore size distribution of CoralPor® Nano-Porous glass powder


Production process of Nano-Porous Glasses 

llustration showing the production process of nano-porous glass




CoralPor® Macro-Porous Glasses

Technical Data

Technical Data of CoralPor® Macro-Porous Glasses CoralPor® Macro-Porous Monoliths  CoralPor® Macro-Porous Granulate
Shape Rods, Discs, Plates Granulate
Average pore diameter typically 1-500 µm typically 1-300 µm
Pore diameter distribution Dependent on customer request Dependent on customer request
Porosity in volume % 10 – 80 % 10 – 80 %

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Whether you need more information, samples, a quote, or advice for a project, I would be delighted to talk to you.

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Julia Ettingshausen, Specialist Glass
Julia Reuß

Specialist Glass