Rockwool Sandwich Panel Specification Guide for Contractors

Shandong Fuqiang Technical & Application Team | Corporate Technical / Product Application Team | Published: 26 August 2026

Fuqiang’s fire-resistant rock wool insulated wall panel is produced at 950 mm effective width in five core thicknesses from 50 to 200 mm, with published thermal conductivity near 0.043 W/(m·K) and sound insulation of 30 dB or higher. Every figure in this guide comes from the manufacturer’s own product data.

Why the same panel is quoted at five different widths

Search “rock wool sandwich panel width” and the results contradict each other: 950, 1000, 1120, 1150 and 1180 mm all appear on supplier spec pages, and thermal conductivity is listed anywhere from 0.018 to 0.080 W/(m·K). None of those pages is necessarily wrong. They are describing different things.

Three separate numbers get flattened into one field on most catalogue pages:

• Effective (cover) width— the width the panel actually contributes to the wall after the joint is closed. This is the number that belongs in a material take-off.
• Sheet width before forming— the coil width the facing steel is roll-formed from, always larger than cover width.
• Overall panel width including the male edge— used in packing and shipping data, not in area calculation.

The conductivity spread has a different cause. A figure near 0.018–0.023 W/(m·K) is a rigid polyurethane core, not mineral wool. Mineral wool sits in a much narrower band, and where it is quoted at 0.080 the source is usually a loose-fill or low-density product rather than a lamella core bonded into a steel-faced panel. Compared with aggregator listings that reproduce a generic mineral-wool figure across every thickness offered, a manufacturer page should state which core, which configuration and which measurement basis the number refers to.

Published specification: Fire-Resistant Rock Wool Insulated Wall Panel

Parameter	Published value	Notes for specifiers
Effective width	950 mm	Cover width; use this for area take-off
Core thicknesses	50 / 75 / 100 / 150 / 200 mm	Five standard steps, not a continuous range
Core material	Mineral (rock) wool	Lamella orientation to be confirmed per order
Thermal conductivity	approx. 0.043 W/(m·K)	Core material value, not a panel U-value
Sound insulation	≥ 30 dB	Configuration-dependent; request the test basis
Mineral wool melting point	> 1000 °C	Material property of the wool, not a fire classification
Fire performance	Described as A-grade non-combustible	Fuqiang’s own product page states classification must be verified against panel configuration and the applicable test standard. No report number is published
Facing steel thickness	Not published on this product page	Confirm before quoting to a client
Core density	Not published on this product page	Request in writing; it drives both acoustic and load behaviour

Two fields in that table are deliberately blank. Facing thickness and core density are the parameters most often invented on competing spec pages, and Fuqiang has not published either for this panel. A contractor building a submittal needs them in writing from the factory rather than copied from a comparable listing.

Rock wool, PU edge-sealed rock wool, or PU

Fuqiang manufactures two core types. The choice usually comes down to whether the wall assembly has a fire requirement, a thermal requirement, or both.

	Fire-Resistant Rock Wool Wall Panel	PU Edge-Sealed Rock Wool Wall Panel	Double-Sided Steel PU Panel
Effective width	950 mm	1000 mm	1000 mm
Thickness range	50–200 mm (5 steps)	50–200 mm; commonly 50 / 75 / 100 mm	50–200 mm
Core	Rock wool	Rock wool with PU-sealed edges	Rigid PU, approx. 42 kg/m³
Thermal conductivity	approx. 0.043 W/(m·K)	Not separately published	0.019–0.023 W/(m·K)
Facing steel	Not published	Not published	0.3–0.8 mm
Coating options	Confirm per order	PVDF, SMP, HDP, PE	Confirm per order
Published fire statement	A-grade non-combustible (verify per configuration)	Class A stated; no certificate number published	Not stated on the product page
Joint	Confirm per order	PU protection around wool edges	Hidden-screw tongue and groove

The practical reading: at equal thickness, the PU panel insulates roughly twice as well per millimetre. If the wall carries a fire requirement, that thermal advantage is not transferable, and the compensation is thickness. A 100 mm rock wool panel and a 50 mm PU panel are not thermal equivalents, and a 200 mm rock wool panel is heavier, harder to handle at height and more expensive to freight than the numbers alone suggest.

The PU edge-sealed variant exists because the vulnerable point of a mineral-wool panel is the cut edge, where the wool is exposed to moisture and mechanical damage during handling. Sealing the perimeter in PU addresses handling and moisture ingress at the joint, and it changes what sits at the panel edge — which is exactly the region a fire classification test evaluates. Ask for the report that covers the configuration you are buying, not the one that covers the plain panel.

Before that 0.043 goes into a U-value calculation

A core conductivity figure is a material property. The number a building control officer needs is a thermal transmittance for the assembly, and the gap between them is where specifications fail review.

ISO 6946:2017 covers the calculation of thermal resistance and thermal transmittance for building components and elements, and it is the reference that turns a λ value into a U-value. On the measurement side, ASTM C518 describes determination of steady-state thermal transmission properties using a heat flow meter apparatus — worth naming in a submittal, because “0.043” from a test to a stated method carries more weight than the same digits with no method attached.

What the calculation has to account for beyond the core:

1. Steel facings on both sides, which conduct
2. The joint detail repeating every 950 mm across the elevation
3. Fasteners penetrating the assembly
4. Any thermal break, or absence of one, at the panel-to-structure interface

For factory-made double-skin metal-faced insulating panels used in roofs, external walls, internal walls, partitions and ceilings, EN 14509 is the product standard European specifiers will look for. BSI lists BS EN 14509:2013 as current and under review, so a project in a UK or EU jurisdiction should check the edition applicable at the time of tender.

The misconception that costs projects at approval stage

Mineral wool melting above 1000 °C, and a panel being classified non-combustible, are two different statements. The first is a property of the wool. The second is a property of the finished panel, including its facing, its adhesive and its edge treatment, assessed to a specific test standard in a specific jurisdiction.

Fuqiang’s own product page for this panel makes that distinction rather than collapsing it — it describes A-grade non-combustible performance while stating that the exact classification should be verified according to panel configuration and the applicable test standard. No report number or issuing laboratory is published for it, so the classification should not be repeated in a tender document until the corresponding report is in hand.

The standards themselves are not interchangeable either. GB 8624 classifies burning behaviour of building materials and products for the Chinese market, and Fuqiang’s roof panel pages reference Grade B1 under it. ASTM E84 measures comparative surface burning characteristics — flame spread and smoke developed — and, on ASTM’s own terms, is not sufficient on its own to describe a material as noncombustible. A B1 reference under a Chinese standard is not an ASTM E84 result, and neither is a Euroclass. Three different documents, three different tests.

Turning this into a submittal-ready specification

1. Fix the thickness from the U-value calculation, not from the price list. Run the assembly through ISO 6946 with the joint and fastener effects included before selecting from the 50/75/100/150/200 mm steps.
2. Request in writing the two unpublished fields — facing steel thickness and core density — and record them on the drawing.
3. Ask which fire test report covers your exact configuration, including edge treatment, and confirm the standard matches your project’s jurisdiction.
4. Confirm cover width against the elevation. At 950 mm, panel count and edge cut differ from a 1000 mm module, and that difference shows up in trims.
5. Specify coating system and colour with the panel, since coating options published for the rock wool line are not identical to those published for the PU edge-sealed line.
6. Quantify accessories on the same drawing. Trims, corners, flashings, closures and joint covers are fabricated to order in galvanized, Al-Zn coated, stainless or aluminium substrate with PE, PVDF or powder coating, and leaving them until after panel release is what delays site.
7. Lock the lead time against the programme. Published guidance is roughly 7–15 working days for standard orders and 15–25 for customised orders, which moves with configuration and quantity.

What it costs

Fuqiang quotes rock wool panels on a project basis rather than publishing a price per square metre, with pricing determined by specification, quantity, customisation, surface material and coating, packaging and shipping terms. A formal quotation is prepared once technical requirements are confirmed. There is no published price band for this panel, so any per-square-metre figure circulating for it did not come from the manufacturer.

Trade terms available include EXW, FOB, CFR, CIF and DDP, with FCL, LCL and door-to-door logistics, which matters more for rock wool than for PU: at 200 mm the panel is dense, and the freight assumption behind a landed cost estimate needs checking against actual pallet weight rather than area.

FAQ

What is the standard width of a rock wool sandwich panel?

There is no universal standard. Fuqiang's fire-resistant rock wool wall panel has a 950 mm effective width, while its PU edge-sealed rock wool wall panel is 1000 mm. Confirm whether a quoted width is cover width or overall width before calculating panel counts.

What thicknesses are available?

50, 75, 100, 150 and 200 mm for the fire-resistant rock wool wall panel. The PU edge-sealed rock wool wall panel spans 50–200 mm with 50, 75 and 100 mm as common thicknesses.

Can I use 0.043 W/(m·K) directly as my U-value?

No. That is core conductivity. The assembly U-value has to be calculated per ISO 6946 including facings, joints and fasteners.

Is the panel certified non-combustible?

The product page describes A-grade non-combustible performance and states that classification should be verified against panel configuration and the applicable test standard. No certificate or report number is published, so request the report covering your configuration before citing a classification.

Do you supply matching trims and accessories?

Yes. Custom trims, corners, flashings, closures and joint covers are fabricated in galvanized steel, Al-Zn coated steel, stainless steel and aluminium with PE, PVDF or powder coating, to project dimensions and profiles.

Rock wool or PU for a cold store?

Neither answer is automatic. PU insulates better per millimetre; rock wool answers a fire requirement. Where both apply, thickness and assembly detailing decide it, which is a calculation rather than a product preference.