What Is Glass Magnesium Rock Wool Sandwich Panel?

Performance Dimension	Typical Data / Range	Unit	Technical Meaning and Notes
Panel composition	Glass magnesium boards with a rock wool insulation core	—	The MgO-based facing boards provide a rigid, impact-resistant surface, while the mineral wool core contributes thermal, fire, and acoustic insulation.
Common overall thickness	50–150	mm	The required thickness depends on the target U-value, fire-rating specification, acoustic objective, span, and support spacing.
Rock wool core density	80–150	kg/m³	Higher density can improve dimensional stability, resistance to airflow, and mechanical performance, but it also increases panel weight.
Thermal conductivity of rock wool core	0.035–0.045	W/(m·K)	Typical design values vary with density, temperature, moisture, and test method. Lower conductivity indicates better insulation.
Approximate thermal resistance of 100 mm core	2.2–2.9	m²·K/W	Calculated approximately as thickness divided by conductivity; board layers, joints, fasteners, and thermal bridges reduce the installed value.
Approximate U-value of 100 mm panel	0.32–0.43	W/(m²·K)	Indicative whole-panel range based on the core conductivity and typical surface resistances; project calculations should include joints and fixings.
Reaction to fire of mineral wool core	Usually Euroclass A1	Classification	Stone wool is generally non-combustible when tested as a suitable product. The classification of the complete sandwich panel must be verified separately.
Glass magnesium board fire behavior	Non-combustible formulations are available	—	Fire performance depends on formulation, thickness, reinforcement, joints, adhesives, and surface finishes; product certification is required for compliance.
Fire-resistance rating	Project-specific; commonly 30–120 minutes for tested assemblies	min	Integrity, insulation, and load-bearing ratings apply only to the tested construction, including panel thickness, supports, fasteners, joints, and penetrations.
Sound absorption coefficient, NRC	Approximately 0.70–1.00 when the mineral wool is exposed or used behind a perforated lining	NRC	A closed MgO-faced panel does not automatically provide this absorption level. Surface perforation, cavity depth, and mounting arrangement are critical.
Sound transmission performance	Typically better than a single thin board; exact R_w/STC must be tested	dB	Mass, airtightness, panel joints, flanking paths, core thickness, and resonance control govern airborne sound insulation. No universal rating applies to every panel.
Core compressive strength	40–120	kPa	Typical range for rigid rock wool products at specified deformation; the declared value depends strongly on density and test standard.
Glass magnesium board thickness	5–12	mm per face	Thicker facings generally improve surface rigidity and impact resistance but increase mass and may affect cutting and installation.
Approximate panel mass	15–30	kg/m²	Indicative for common thicknesses and densities. Actual mass must be checked for structural handling, lifting, and support design.
Dimensional stability	Low thermal movement; joints still require allowance	—	Rock wool is dimensionally stable, but moisture, temperature changes, board movement, and building settlement can affect joints and finishes.
Moisture resistance	Good when edges and joints are correctly sealed	—	Rock wool is water-repellent in many building products, but prolonged water exposure can reduce thermal performance. MgO boards require compatibility and moisture-control detailing.
Typical applications	Interior partitions, exterior walls, roofs, cleanrooms, industrial buildings, and acoustic enclosures	—	Selection must be based on the required fire, thermal, acoustic, structural, moisture, hygiene, and installation performance of the complete assembly.