Specification details for 25mm

EN-Engineering-Product-Coretinium-All sizes-Overview


Why composite materials work so well

As with the principles that make a steel I-beam so strong, it is the outside faces of a composite that does most of the work when the sheet is subject to bending, so separating these faces makes for efficient use of the material.

For a composite to be most effective:

  • The core needs to have good compression resistance and shear strength.
  • The skin material needs to have a high modulus and tensile strength.
  • The adhesive bond of skin to core is critical for maintaining composite performance.

Composites: A sustainable choice
This efficient use of materials means less raw materials are needed to create high performance sheets.

Coretinium-Why composite materials work so well









Coretinium derives its performance from the high quality pre-finished steel skins

The high strength of steel
The high Young’s modulus of steel makes it a very effective skin material compared to other options:

 Coretinium - The high strength of steel

















The other benefits of steel
Steel offers some significant benefits over other traditional skin materials:

  • Durable – UV resistant skin.
  • Fire safe – A1 non-combustible.
  • Resistant to creep.
  • Magnetic.
  • Easy to process on CNC.
  • Easy to mechanically fix to.
  • Strong stable surface for adhesive.
  • Recyclable*.

* With typically 85% of product weight coming from the Coretinium® steel skins; at its end-of-life the composite sheet can be considered as steel scrap and recycled back into the steel making process without the need to separate the core from the skin.

Optimised materials
Colorcoat Prisma® pre-finished steel outer skins combine to provide enhanced aesthetics and long-term performance and durability.

Colorcoat Prisma® pre-finished steel layers

Coretinium - Colorcoat Prisma® pre-finished steel layers















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Product properties

Coretinium product dimensions











Total weight
9.1kg/m2 with 0.40mm skins (s)
11.5kg/m2 with 0.55mm skins (s)
13.4kg/m2 with 0.675mm skins (s)
Note: asymmetric skin combinations are possible

Total product thickness (H) 
25mm ± 0.2mm

Thermal properties
Thermal conductivity - K Value ( λ ) : 0.090 W/mK
Thermal resistance - R Value : 0.278 m2k/W
Core composition
Co-polymer blend of polypropylene with mineral fill for additional Strength 

Core specifications (nominal)
Cell size (D)                   7.0mm Ø
Cell wall thickness (t)  400µm
Core thickness             23.9mm
Core density                 80kg/m3

Skin composition
Pre-finished steel skins
Coatings: 255g/m2 Galvalloy™ with a 3 layer 65 micron Colorcoat Prisma® paint finish

Young's modulus: 207 GPa
Poisson’s Ratio: 0.3
Density: 7854 kg/m3

Steel specification
0.55mm S320GD+ZA (320N/mmmin yield stress)
0.40mm S280GD+ZA (280N/mmmin yield stress)
0.675mm S280GD+ZA (280N/mmmin yield stress)

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Coretinium® can be supplied as either mill width sheets for customers to cut to size themselves or tight tolerance custom sized sheets processed on Tata Steel’s own 5 axis CNC.

Mill width sheets

Steel width: 1240mm +/- 3mm
Core width: 1290mm +/- 10mm
Lengths (25mm thick panel): 2.8m to 10m

Coretinium - mill width sheets









Cut to size sheets

Widths from 250mm to 1240mm
Lengths from 300mm to 6250mm
CNC tolerances at +/- 0.5mm

Coretinium - cut to size sheets








Additional processing

Hole drilling / cut outs
Core stripping on edges

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25mm applications

25mm panels made with a lightweight core has exceptional flexural rigidity to weight making it ideal for applications were products need to maintain their flatness while being subjected to universally distributed loads    

Coretinium Bild 19












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