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A mineral wool ceiling board is a suspended-ceiling panel made from processed mineral fibers (slag or rock wool) bonded with a starch binder into rigid, sound-absorbing tiles. It backs offices, hospitals, and schools. This guide clarifies terminology, board makeup, the key numbers, and a specifier's checklist. See our NRC vs CAC explained article for the acoustic math.
Key Takeaways
- Mineral wool boards deliver NRC 0.55–0.85 with Class A fire (ASTM E84 / EN 13501-1 A2-s1,d0).
- RH99 rating means stable in high-humidity zones; it is moisture-resistant, not waterproof.
- Boards are 100% asbestos-free with ISO 9001, CE, and SGS certifications.
- Match edge type and 0.80+ light reflectance to your grid.
- Built partly from recycled slag with a low-VOC binder for healthier air.
"Mineral wool" covers fibers spun from rock, slag, or glass. Rock wool and stone wool come from basalt; slag wool is spun from blast-furnace slag. "Mineral fiber" is the umbrella label on ceiling tiles. A mineral wool ceiling board uses rock or slag wool as its fiber—never fiberglass, never asbestos.
The core recipe is tuned for performance:
Slag or rock wool (≈55–75%): the fiber mat; slag wool reuses recycled blast-furnace slag.
Recycled cellulose / paper: bulks the core and adds stiffness.
Starch binder: low-emission, water-soluble, no formaldehyde.
Perlite & fillers: volcanic glass that lowers density and boosts thermal resistance.
Most boards use a wet-formed process: fiber slurry is sprayed with binder, deckled, pressed, and oven-cured into a flat sheet. This yields a dense fiber web—better than dry-laid fiberglass for holding a precise NRC while resisting sag. The raw material is detailed on Wikipedia's mineral wool page.
Specifiers watch two numbers: NRC (sound absorbed) and CAC (sound blocked). Our boards span NRC 0.55–0.85 and are fire tested to ASTM E84 Class A. The full mineral wool ceiling board products line follows the specs below.
Fire, moisture, and build. The non-combustible core earns ASTM E84 Class A. The RH70–RH99 rating is the max humidity before sagging; RH99 suits pools and tropics but is moisture-resistant, not waterproof. A 0.80+ LR bounces more ambient light and cuts energy use; your edge (Square Lay-in, Tegular, Concealed) must match the grid to avoid lipping.
| Specification | Typical Value |
|---|---|
| NRC | 0.55–0.85 |
| Fire Rating | ASTM E84 Class A / EN 13501-1 A2-s1,d0 |
| Humidity Resistance | RH70–RH99 |
| Thickness | 10–20 mm |
| Standard Sizes | 595×595, 600×600, 600×1200 mm |
| Edge Types | Square Lay-in, Tegular, Concealed |
| Light Reflectance | 0.80+ |
| Material Safety | 100% asbestos-free |
| Certifications | ISO 9001, CE, SGS |
Three environments benefit most: offices for privacy, schools and hospitals for easy-clean surfaces, retail or hospitality for a seamless look. Three real installs: a Shanghai office cut echo with 0.80 NRC boards; a Vietnam hospital used RH99 panels for humid wards; and a Middle East client cleared sign-off with our ASTM E84 Class A and CE documentation. Explore the aluminum clip-in ceiling line for wash-down areas needing a different system.
Gypsum is cheaper with a monolithic look, but heavy, hard to access above, and prone to sag in humidity. A mineral wool ceiling board is lighter, reversible for MEP access, and holds RH99 flatness. For a head-to-head on cost, weight, and acoustics, see our mineral wool vs. gypsum board: which to specify guide.
Both absorb sound, but mineral wool wins on fire and humidity while fiberglass is lighter and cheaper. For interiors where Class A fire and RH99 matter, mineral wool is the safer specify. Edge cases are covered in our complete technical FAQs.
Confirm NRC target (0.55 min for offices, 0.70+ for noisy zones).
Set fire class: ASTM E84 Class A / EN 13501-1 A2-s1,d0 for public buildings.
Pick RH99 if humidity exceeds 70% or in pools/kitchens.
Choose edge type to match your grid (Square Lay-in, Tegular, Concealed).
Verify LR 0.80+ for energy-efficient lighting.
Check thickness 10–20 mm and density against structural load limits.
Confirm certifications: ISO 9001, CE, SGS, 100% asbestos-free.
A mineral wool ceiling board is 100% asbestos-free and built partly from recycled slag. The starch binder is low-VOC, so off-gassing stays within tight limits; the 0.80+ LR reduces lighting energy. With ISO 9001 and CE, it is a defensible LEED or BREEAM choice.
Acclimate: store boards flat 24–48 h before lift.
Support the grid: use correct main/tee spacing; Concealed edges need a carrier.
Handle clean: cut with a sharp knife and vacuum edges.
Maintain simply: dry-dust or lightly vacuum; spot-clean with a damp cloth—never flood.
What is a mineral wool ceiling board made of?
Slag or rock wool fibers bonded with a starch or resin binder, pressed into rigid, non-combustible tiles.
Is it fire rated?
Yes—ASTM E84 Class A and EN 13501-1 A2-s1,d0, verified by CE and SGS.
Is it waterproof?
No. It is moisture-resistant to RH99, not waterproof; avoid direct water contact.
Mineral wool vs. fiberglass?
Mineral wool offers better fire and humidity performance; fiberglass is lighter and lower cost.
Is it asbestos-free?
Yes, 100% asbestos-free, compliant with ISO 9001, CE, and SGS.
Where should I use it?
Offices, hospitals, schools, retail, and humid zones up to RH99; see the full mineral fiber ceiling tile catalog.
Which certifications do the boards carry?
ISO 9001 for quality, CE marking for Europe, and SGS third-party fire and content testing.
Can I get a sample before specifying?
Yes—request a sample of any SKU; we will ship a cut panel for your NRC and finish checks.
A mineral wool ceiling board earns its place through acoustics, Class A fire safety, and RH99 stability. Use the checklist above, then browse mineral wool ceiling board products or request a sample to validate your spec.