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Siderise NXR Nexus Core For Bonded Composite Structures - Fire-safe Stone Wool Core

Verified by manufacturer 6 months ago

110 kg/m² density

Siderise Group Variant:

Siderise Nexus Core offers both specifiers and manufacturers a firesafe insulation core with superb integrity, rigidity, flatness and in-built structural performance.

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Siderise Nexus Core provides a fire-safe stone wool insulation core for composite structures such as architectural panels and doors.

Siderise Nexus Core provides a cost-effective pre-finished rigid core to be used wherever thermal, fire, and acoustic insulation is required within a bonded composite structure. 


Siderise Nexus Core boards are produced using stone wool slab material which has been Euroclass rated A1 and is specifically formulated to a Siderise specification for use in this exacting application.

Stone wool is manufactured from volcanic rock which has been melted in a furnace to temperatures in excess of 1500°C. The molten product is then spun into a wool-like substance that has excellent fire, acoustic and thermal properties.

 The unique Nexus process takes this insulating material which is then cut into strips and rotated through 90 degrees so the fibres are perpendicular to the board surface.

Additionally, the strips are subjected to lateral compression which eliminates any gaps and produces a more homogeneous board with a substantially better rigidity than a standard stone wool slab of the same density. Whilst under compression the product is faced with an open filament net which both maintains the compression and aids handleability.

The Core board should be bonded on the net face. Siderise maintains a close working partnership with major adhesive suppliers to ensure the compatibility of materials and attainment of optimum bond strengths.

Features and benefits:

  • Nexus Core is made from insulation that is classified A1 to European Fire Classification (EN 13501-1).
  • Precision manufacturing and tight tolerances optimise product strength.
  • Manufacturers can reduce cost/weight with thinner facings.
  • Low thickness tolerance means that thinner faces remain aesthetically pleasing.
  • Open filament net facilitates a strong adhesive bond and enables easy handling.
  • The Nexus production process produces a strong, homogeneous stonewool core optimizing composite performance.

General information



Guidance for specification option:


Manufacturer guidance

Transparent net faces



Guidance for specification option:

Polymer net

Manufacturer guidance

Stonewool leading edges and net facings









Guidance for specification option:

Standard board length

Manufacturer guidance

Standard boards up to 2400mm in 1mm increments 



Guidance for specification option:

Up to 1200mm in 1mm increments 

Manufacturer guidance

Up to 1200mm



Guidance for specification option:

25mm -175mm in 1mm increments

Manufacturer guidance

Thickness between 25mm and 175mm in 1mm increments 


Pr_25_57_06_56 Mineral wool slab insulationPrimary


H11/780 Thermal insulation

L20/430 Wood doorsets

L20/410 Wood doorsets

L20/420 Wood doorsets

L20/480 Doorsets

L20/55 Doorsets

Product range

Curtain Walling

Specification data - Mineral wool slab insulation


Guidance for specification option:

Insert requirements: 25–175 mm in 1 mm increments.


Polymer filament net.




110 kg/m³.

Manufacturer guidance

Standard density option; other densities may be made available upon request subject to minimum volume order requirements. Contact manufacturer for further details.

Thermal conductivity (maximum)

0.041 W/m·K.

Compressive strength (minimum)

55 kPa.

Fire performance

To EN 1364-3.

Guidance for specification option:

The fire rating of a panel system will depend on a variety of factors including:

  • Nexus Core grade and thickness.
  • Facing type and thickness.
  • Panel cover width, span, joint detail and fixing.

Consult manufacturer for details.

Sound insulation rating

Manufacturer's standard.

Guidance for specification option:

The acoustic performance is system-specific and is heavily influenced both by the materials used and the way they are assembled. The acoustic performance of a given panel using Nexus Core depends primarily on the surface mass of the panel linings and the depth of the cavity.

Consult manufacturer for details.

Performance characteristics

Tensile delamination strength (minimum): 100 kPa.

Sustainability data

Contains Red List materials


Country of material origin

United Kingdom

Country of product manufacture

United Kingdom



BIM objects


NBS BIM Object Standard

This BIM object has been authored to meet the requirements of the NBS BIM Object Standard.

Find out more about the NBS BIM Object Standard.

Platform Compatible Version




Revit 2016



Nexus Core for bonded composite structures – Technical Data v1.02

Nexus Core for bonded composite structures – Technical Data v1.02

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