Refractory materials with Poraver expanded glass

Refractory materials with Poraver expanded glass

September 18, 2018

For economical production with high-temperature processes, it is necessary to minimise energy loss within the scope of energy management by means of suitable insulation measures. Poraver expanded glass granules are characterised by their low density, high strength, round grain shape and thermal insulation properties. Poraver is worldwide established as a lightweight aggregate for dry mortar, lightweight concrete, panels, insulating fills and special applications.

Poraver is an excellent lightweight aggregate and filler for a wide variety of refractory products and can be used similar to vermiculite or expanded shale respectively clay (ESCS – Expanded Shale, Clay and Slate).

Unshaped (monolithic) products

  • Heat resistant lightweight concrete
  • Insulating mortar
  • Backfills
  • Gunning mixes
  • Ramming mixes
  • Insulating fills

Shaped products

  • Moulded parts from refractory lightweight concrete
  • Insulating concrete parts
  • Insulating panels

Poraver Advantages

  • 7 different grain sizes from 0.04 mm to 4 mm allow the composition of a sieve line with a dense structure
  • The density can be specifically adjusted by selecting different grain sizes and very good thermal insulation properties can be achieved
  • The spherical shape, low weight and high compressive strength of the Poraver grain make it easy and safe to process the mixes
  • Compared to many other lightweight fillers, Poraver offers low water absorption, which reduces the water requirement of the mixture and therefore achieves high strength
  • Poraver offers a constant material quality and chemical composition – ensuring consistent quality of the finished products


In the following trials Poraver was tested in hydraulically hardening, unshaped (monolithic) and insulating refractory lightweight concretes. The material properties were tested on a pourable mixture for a firing at 1,000 °C.


The measurements on the tested system clearly show that the technological properties of the product are within the desired range even after the firing at 1,000° C. The flexural strength of the mortar, after firing, corresponds almost to the value of the initial test and the compressive strength is approximately 1/3 lower than before the test. The remaining longitudinal shrinkage of the system of -0.8 % is within the acceptable range.

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