The refined expanded glass granulate of the NEBU®Light Series brings many advantages to your products. Light-weight and high-yield are considered standard.

High-temperature resistance

Our expanded glass granulates are protected by a special process in such a way that the usual melting point of the glass is raised from 800°C to more than 1,350°C. The commonly known processing characteristics are maintained in this case, however, your product with NEBU®Light your products can access temperature ranges which have not been possible up to now. Non-combustible? Non-flammable? Those were the keywords with which expanded glass was always advertised. Now you can have no trouble adding “high-temperature-resistant“. In the emergency case, your product survives that decisive amount longer.


Principle product properties

  • High fireproof quality!
  • Improved compressive strength
  • High yield
  • Reduced or low shrinkage level


With air for lightness

  • Decrease in density: With densities < 320 kg/m3, heavy products can be made “lightweight”.
  • “Lighten up” the balancing of high weights. Take care of the end user.
  • Weight reduction also means less pressure on supporting component parts. Slim construction is enabled.


With air for cost saving

  • Improved packing density
  • Optimized filling capacities
  • Economic volume-price ratio in comparison with usual filling materials
  • Economizing potential in case of binding agents
  • Transport cost reduction through weight reduction of the lightweight construction parts


Characteristics and advantages at a glance

  • Purely mineral
  • Non-combustible
  • Long-term stability, no settling
  • Processing-friendly, round grain
  • Very good pourability
  • Amorphous glass structure prevents silicosis hazard

Structure and Function of NEBU®Light

NEBU®Light – old material, newly packed

For some decades expanded glasses and expanded glass granulate have been employed in the sectors involving lightweight construction, as well as thermal and acoustic insulation. These materials are also very popular as a lightweight filling material. Particularly in safety-relevant areas, however, the usual standards have a serious disadvantage which is the lack of high-temperature stability. The investigation of the melting characteristic behavior by means of heating microscopy shows that the softening point of these glasses is already reached at 700°C, and that they have completely melted at 900°C. The protection process developed by NEBUMA is based on a chemical conversion. We refine the surface of arbitrary hollow-glass balls or expanded glass granulate in such a way that, with the occurrence of increased temperatures (>700°C) through glass-ceramic processes, a new material is formed which resists temperatures >1,350°C.

A little trick with a big effect. Products which are manufactured from NEBU®Light are especially well suited for temperature-critical areas.


Areas of Application in Overview

Area of application

Thanks to its inorganic nature, the material NEBU®Light can be categorized into construction material Class A1 and is generally suited for use in various building products. NEBU®Light is used when materials traditionally used reach their limits e.g. in areas relevant to safety where losses in strength with thermal loading must be avoided.

NEBU®Light is particularly well suited for plaster, reinforcing mortar, concrete-repair mortar, panels and light-weight concrete. NEBU®Light is also very well suited as a compensation filling material.

Through loose granulate or as a plate, NEBU®Light can be worked into fire-protection doors and gates extremely well. A new, exciting field of application is preventive fire protection. Thus cable conduits or utility switching stations can be filled with NEBU®Light in order to prevent a possible cable fire or to reduce the spreading of the fire. Several effects of our product are made use of here. On the one hand, the thermal insulating effect helps to suppress the heat, so that this does not reach other components in this building part. On the other hand, a thin film of melted NEBU®Light granulate is formed, which suppresses the oxygen supply to the fire at its source. With the combination of the high-temperature insulation and the glass film, the fire is extinguished at its point of origin.

With regard to the small percentage of “melted” granulate, the major part of the intact granulate can be employed again and will guarantee the security of your customers over the long term.

Grain Sizes

NEBU®Light - Expanded glass granulate from (recycling) glass (>95% SiO2)
Grain size
Apparent density [kg/m3]Bulk density
Mean grain strength
Water consumption
[V %]
Water consumption 
[M %]
0,25-0,5610 ± 30320 ± 302,56,515
0,5-1590 ± 30290 ± 302,14,314
1-2550 ± 30260 ± 301,73,312
2-4530 ± 30220 ± 301,62,19

* Test in accordance with DIN EN 13055-1


Oversize grain≤ 10 mass%
Undersized grain≤ 15 mass%
pH value5-8
Moisture content≤ 0,5 %
Water-soluble chloride< 0,001 mass%
Total sulfur< 0,1 mass%
Acid soluble sulfate< 0,010 mass%
Beginning of softeningapprox. 1,300°C, in cluster
Colorgray-beige to white


The grain strength of the individual granulations can vary slightly within the tolerance range of the bulk density. Special granulations are possible on inquiry.


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