Mineral wool sandwich panels — GS MW
Sandwich panels with a lamella mineral wool core. Fire reaction class A2-s1,d0 (non-combustible).
GS MW are non-combustible sandwich panels by Gór-Stal with a lamella mineral wool core (fibres perpendicular to the facings → higher compressive strength). The choice for buildings with the most demanding fire requirements and for fire-compartment separation walls. 6 variants:
- S / QA-S — wall panels, concealed fixing
- U / QA-U — wall panels, exposed fixing
- CH / QA-CH — cold storage panels for buildings requiring non-combustibility (e.g. cold storage holding flammable goods)
The QA series (Quality Assurance) features an improved joint profile and better air-tightness — λD 0.040 W/(m·K) vs 0.044 for the standard variants.
Common parameters: lamella mineral wool core, fire reaction class A2-s1,d0 (non-combustible), PZH hygiene certificate for all variants, module length up to 14 m, thicknesses from 50 to 200 mm.
When GS MW instead of PIR (insPIRe): public buildings, halls storing flammable goods (wood, paper, plastics), boundary walls between fire compartments, buildings over 12 m tall where regulations require a non-flame-spreading (NRO) facade.
Variants
MW CH
Mineral wool cold storage sandwich panel — A2-s1,d0, EI up to 240, λD 0.044, thicknesses 100–250 mm.
λD = 0,044 W/(m·K)
MW QA CH
Mineral wool cold storage panel QA — A2-s1,d0, EI up to 180, λD 0.040, thicknesses 100–250 mm, no micro-cracking joint profile.
λD = 0,040 W/(m·K)
MW QA S
Mineral wool wall panel QA — A2-s1,d0, λD 0.040, no micro-cracking joint profile, thickness 80 mm.
λD = 0,040 W/(m·K)
MW QA U
Mineral wool wall panel QA with concealed fixing — A2-s1,d0, EI 120, λD 0.040, thicknesses 80–120 mm.
λD = 0,040 W/(m·K)
MW S
Mineral wool wall sandwich panel — class A2-s1,d0, EI 60, λD 0.044, thickness 80 mm.
λD = 0,044 W/(m·K)
MW U
Mineral wool wall panel with concealed fixing — A2-s1,d0, EI 120, λD 0.044, thicknesses 80–120 mm.
λD = 0,044 W/(m·K)
Variant comparison
| Variant | Facings | Thermal conductivity (λ) | Applications |
|---|---|---|---|
| MW CH | Galvanised steel sheet both sides per EN 10346, organic polyester paint 25 μm | 0,044 W/(m·K) | cold store walls (temperature above 0°C) with class A2 requirement, freezer walls (temperature below 0°C) with class A2 requirement |
| MW QA CH | Galvanised steel sheet both sides per EN 10346, organic polyester paint 25 μm | 0,040 W/(m·K) | cold store walls (temperature above 0°C) with class A2 and QA durability requirement, freezer walls (temperature below 0°C) with class A2 requirement |
| MW QA S | Galvanised steel sheet both sides per EN 10346, organic polyester paint 25 μm | 0,040 W/(m·K) | external and internal walls in industrial buildings with class A2 requirement, buildings requiring corrosion-resistant joints (corrosivity categories C1–C3 per EN ISO 12944-2) |
| MW QA U | Galvanised steel sheet both sides per EN 10346, organic polyester paint 25 μm | 0,040 W/(m·K) | external walls with class A2 requirement and concealed fixing aesthetics, EI 120 fire separation partitions with concealed joint system |
| MW S | Galvanised steel sheet both sides per EN 10346, organic polyester paint 25 μm | 0,044 W/(m·K) | external and internal walls of industrial buildings, buildings requiring class A2 fire reaction (non-combustible) |
| MW U | Galvanised steel sheet both sides per EN 10346, organic polyester paint 25 μm | 0,044 W/(m·K) | external walls of buildings with class A2 requirement and clean facade, warehouse and production halls with EI 120 fire requirements |
Frequently asked questions
What are mineral-wool (MiWo) sandwich panels?+
GS MW are non-combustible sandwich panels with steel facings and a core of lamella mineral wool (fibres perpendicular to the facings → higher compressive strength and delamination resistance). It is a ready wall or roof element installed like a panel — with the highest reaction-to-fire class.
When should you choose GS MW (mineral wool) instead of insPIRe® (PIR)?+
When the project requires a non-combustible A2 material: fire-separation walls between zones, buildings with elevated fire requirements (high-bay warehouses, public buildings, some production plants). PIR panels (insPIRe®) are class B — lighter and with better insulation at the same thickness, but combustible in the Euroclass system.
What is the reaction-to-fire class of GS MW?+
A2-s1,d0 per EN 13501-1 — a non-combustible material, minimal smoke emission, no flaming droplets. This is the highest practically achievable class for sandwich panels, required e.g. on escape routes and fire-separation walls.
What applications are GS MW sandwich panels used for?+
Halls and warehouses with fire requirements, fire-separation walls, public buildings, cold stores and acoustic partitions (mineral wool dampens sound better than PIR). Six variants are available — wall (hidden profile), cold-store, in QA-certified and standard versions.
What is the lead time and transport for GS MW panels?+
Mineral-wool sandwich panels are made to order, with a typical lead time of about 35 working days. Transport depends on the order size (full-length panels — truck transport). Mineral-wool panels are heavier than PIR — worth accounting for in the substructure design and unloading logistics (unloading on the recipient's side).
What does the QA-certified variant mean?+
QA variants are panels covered by additional manufacturer quality control, used where the investor or project requires extended conformity documentation. A BOKKA advisor will tell you whether a QA variant is necessary for your project or whether the standard one is sufficient.