Composite structures

The NKG material is produced using the Pultrusion method


Pultrusion is a cntinuous method of manufacturing glass-fibre reinforced thermoset profiles. The term originates from the English “pull” and “extrusion”, and it refers to the production of profiles by pulling glass fibres soaked in resins according to the NKG formula through a system of moulds giving an appropriate shape, and then thermo-curing them.


Composite profiles produced by the pultrusion method consist of polyester resins, reinforced with glass fibers with the addition of a flame retardant and antistatic agent.


Production using the pultrusion method is virtually fully automated, although the phase of developing the right mixture for the relevant technical requirements and preparing the moulds can take several months or years, hence the composition of glass roving, polyester resin, flame retardant and graphene nanotubes which meets the requirements of flame retardancy, anti-electrostaticity and non-toxicity developed by KG Consulting Krzysztof Gregorek is called NKG or New Mining Composite.

Characteristics of NKG Composite Material

NKG New Mining Composite material is a raw material intended for use as a base material for the manufacture of composite structural components used in the mining industry of coal, potash salt and copper mines as a flame retardant, anti-electrostatic and non-toxic material meeting the requirements of the following standards:

-PN-EN ISO/IEC 80079-38: 2017-02 Explosive atmospheres – part 38 : equipment and components for use in explosive atmospheres occurring in underground mines;

-PN-EN ISO 80079-36: 2016-07 Explosive atmospheres -Part 36 Non-electrical equipment for explosive atmospheres – Methodology and requirements;

-PN-G-46222:1997 Mining shafts and ladder compartments. Requirements and Testing.

Products made by pultrusion are characterized by excellent mechanical properties.


Properties of NKG

  • low specific weight (1.75 g/cm3)
    thermal insulation
    electrical insulation
  • High chemical resistance (does not oxidize and is very resistant to acids)
  • does not produce sparks during grinding and cutting
  • possibility of colouring in the mass (full range of RAL colors)
  • resistance to UV radiation, color fastness