Cleanroom Sandwich Panel Core Materials - Complete Selection Guide

More Core Options. More Application Scenarios. The Right Panel for Every Project.

Choosing the correct core material is the single most important decision when specifying cleanroom and insulated sandwich panels. The core determines fire rating, weight, thermal performance, acoustic behavior, moisture resistance, and ultimately, total project cost. As a professional cleanroom panel manufacturer, we offer nine core material options - so your enclosure, wall system, or partition is engineered for your exact application, not a compromise.

Use this guide to compare cores and identify the best fit for pharmaceutical, food, electronics, healthcare, logistics, and industrial projects.

     

Quick Selection Table

Core Material	Fire Rating	Weight	Thermal Insulation	Best For
Rock Wool (Mineral Wool)	A1 / High	Medium–Heavy	Excellent	Fire-rated walls, pharma & industrial cleanrooms
MgO Rock Wool (玻镁岩棉)	A / High	Heavy	Excellent	High-strength fire walls, hospital & lab partitions
Gypsum Rock Wool	A / High	Medium	Very Good	Fire-rated partitions, dry-room walls
Aluminum Honeycomb	B1 / Good	Ultra-Light	Moderate	Lightweight ceilings, doors, modular enclosures
Gypsum Aluminum Honeycomb	B1 / Good	Light	Good	Cleanroom ceilings & partitions needing flatness
MgO Grid (玻镁格栅)	A / High	Medium	Good	Ceilings, partitions, high-strength walkable systems
Fire-Retardant Paper Honeycomb	B1 / Good	Ultra-Light	Moderate	Cost-effective ceilings, lightweight partitions
Silicon-Rock (硅岩)	A2-B1	Light	Very Good	Balanced performance walls, cost-sensitive projects
Magnesium Oxysulfide (MOS)	A / High	Medium	Very Good	Humid environments, fire-rated & moisture-prone areas

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1. Rock Wool Sandwich Panel (Mineral Wool Panel)

The industry-standard core for fire safety and thermal performance.

The rock wool cleanroom panel is built with high-density mineral wool core bonded between galvanized or stainless steel facing sheets. Non-combustible and dimensionally stable, it is the most widely specified core for cleanroom walls where fire regulations are strict.

Key Advantages

Non-combustible core (fire rating up to A1) - inhibits flame spread and generates minimal smoke

Excellent thermal insulation - stable interior temperatures, lower HVAC energy consumption

Outstanding acoustic absorption - reduces equipment and process noise

High compressive strength and long-term dimensional stability

Available in various thicknesses (50 / 75 / 100 mm) and steel facings

Ideal Applications Pharmaceutical cleanrooms (GMP), hospital operating rooms, electronics and semiconductor workshops, industrial plants, fire-rated partitions and equipment enclosures.

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2. MgO Rock Wool Sandwich Panel (Fiberglass Magnesium + Rock Wool)

Maximum structural strength with A-grade fire performance.

The MgO rock wool panel combines a mineral wool core with rigid fiberglass magnesium (MgO) board layers, delivering the highest surface hardness and impact resistance in our range. It withstands frequent cleaning, disinfectants, and physical contact in demanding environments.

Key Advantages

A-grade fire resistance with superior surface rigidity

High impact strength - resists dents, scratches, and forklift or trolley damage

Excellent water and moisture resistance; no deformation in humid conditions

Anti-mold and anti-bacterial surface suitability for hygienic cleaning protocols

Strong nail-holding capacity for wall-mounted equipment

Ideal Applications Hospital operating theaters and ICU wards, GMP pharmaceutical workshops, food processing plants, laboratories, high-traffic corridors, and wall systems requiring heavy attachments.

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3. Gypsum Rock Wool Sandwich Panel

Balanced fire performance and cost for clean partitions.

This panel pairs a gypsum core layer with rock wool insulation, offering solid fire resistance and sound insulation at a competitive price point. The gypsum layer improves flatness and screw-holding performance for easy installation of fixtures and accessories.

Key Advantages

A-grade fire performance with reliable integrity under fire exposure

Cost-effective fire-rated solution for interior partitions

Good sound insulation for offices and production areas

Excellent panel flatness and easy on-site fabrication

Environmentally friendly, non-toxic core

Ideal Applications Fire-rated cleanroom partitions, dry process rooms, office-to-production transitions, commercial kitchens, and projects requiring certified fire compartments at controlled cost.

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4. Aluminum Honeycomb Sandwich Panel

The lightest high-strength core in the industry.

An aerospace-derived aluminum honeycomb core delivers an exceptional strength-to-weight ratio. Panels stay perfectly flat over large spans yet remain light enough for one-person handling, ceiling systems, and fast installation.

Key Advantages

Ultra-lightweight - dramatically reduces structural load and installation labor

Outstanding flatness and rigidity - ideal for large spans and high ceilings

Excellent vibration damping and acoustic deadening

Corrosion-resistant, moisture-proof, and fully recyclable

Long service life with stable performance

Ideal Applications Cleanroom ceilings and large-span partitions, air shower and pass-through box enclosures, machine housings, modular prefabricated rooms, shipbuilding, and weight-sensitive retrofit projects.

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5. Gypsum Aluminum Honeycomb Sandwich Panel

Flat, light, and refined - for premium clean interiors.

Combining an aluminum honeycomb structure with gypsum facing layers, this panel achieves remarkable surface flatness and a high-end finish. It bridges the gap between pure honeycomb panels and traditional gypsum systems.

Key Advantages

Superior surface flatness - seamless, premium wall appearance

Light weight with high bending resistance

Good fire performance for interior applications

Easy to cut, join, and finish on site

Excellent screw-holding for fixtures, displays, and equipment

Ideal Applications High-end cleanroom partitions, laboratory interiors, hospital walls, exhibition and modular spaces, and applications where aesthetics and flatness are as important as performance.

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6. MgO Grid Sandwich Panel (Fiberglass Magnesium Grid Panel)

High strength, moderate weight, engineered for ceilings and partitions.

The MgO grid panel uses a fiberglass magnesium (MgO) board core in a grid (egg-crate) structure. This geometry delivers impressive rigidity and fire performance while keeping weight and material cost moderate - an efficient all-rounder.

Key Advantages

A-grade fire-resistant core suitable for demanding fire codes

High strength-to-weight ratio thanks to the grid structure

Water-resistant; no rot, warping, or delamination

Anti-mold, insect-proof, and chemical resistant

Easy processing and stable dimensions

Ideal Applications Cleanroom ceiling systems (including walkable ceilings), mezzanine partitions, hospital and laboratory walls, fire compartments, and applications needing strength without rock wool weight.

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7. Fire-Retardant Paper Honeycomb Sandwich Panel

Lightweight performance at the most economical price.

A fire-retardant treated paper honeycomb core offers the lowest weight and cost per square meter in our range. Treated with flame retardants, it achieves B1 fire classification while remaining remarkably light - perfect for large ceiling areas and budget-conscious projects.

Key Advantages

Most cost-effective core option for large coverage areas

Ultra-lightweight - fast installation, minimal structural load

B1 fire-retardant classification

Good sound absorption from the honeycomb cell structure

Eco-friendly and recyclable

Ideal Applications Cleanroom ceiling grids, lightweight interior partitions, warehouse and logistics office enclosures, temporary or expandable structures, and projects optimizing budget without sacrificing compliance.

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8. Silicon-Rock Sandwich Panel (硅岩 Panel)

The balanced performer - light, fire-safe, and cost-efficient.

The silicon-rock core is a lightweight inorganic composite engineered to combine near-A-grade fire performance with low density. It fills the gap between paper honeycomb economy and rock wool performance, making it one of the most versatile cores for modern cleanroom projects.

Key Advantages

Lightweight with high fire rating (A2–B1) - safety without heavy steel structure

Very good thermal insulation - energy-efficient enclosure

Fine closed-cell structure; low water absorption

Smooth, flat panel surface for cleanroom-grade finishing

Strong cost-to-performance ratio

Ideal Applications Electronics and precision manufacturing cleanrooms, food and beverage processing rooms, cold-chain support areas, general clean partitions, and projects balancing fire code, weight, and budget.

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9. Magnesium Oxysulfide Sandwich Panel (MOS Panel)

Advanced fire and moisture performance for harsh environments.

Magnesium oxysulfide (MOS) is an upgraded magnesium-based core with enhanced water resistance compared to standard MgO products. It maintains A-grade fire performance while resisting humidity, condensation, and wet-process cleaning - ideal where moisture is the enemy.

Key Advantages

A-grade fire resistance with low smoke emission

Superior moisture and water resistance - no swelling or loss of strength in humid conditions

Anti-mold, anti-bacterial, and resistant to chemical cleaning agents

High strength with moderate weight

Stable long-term performance in wet or washdown areas

Ideal Applications Food processing and seafood plants, wet-process workshops, cold storage antechambers, coastal or high-humidity facilities, pharmaceutical wash areas, and any environment with steam or frequent washdowns.

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How to Choose the Right Core - 4 Simple Questions

What fire rating does your code require? → A1/A: Rock Wool, MgO Rock Wool, Gypsum Rock Wool, MgO Grid, MOS · A2–B1: Silicon-Rock, Honeycomb cores

Is weight a constraint? → Ultra-light: Aluminum & Paper Honeycomb · Light: Silicon-Rock · Standard: Rock Wool family

Will the environment be humid or wet? → Magnesium Oxysulfide (MOS) or MgO-based cores

What is your budget per square meter? → Economy: Paper Honeycomb · Balanced: Silicon-Rock, Gypsum cores · Premium: Rock Wool, MgO Rock Wool

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Why Source Your Cleanroom Panels From Us

9 core materials, one factory - full-range supply with consistent steel facing, colors, and profiles

Certified quality - fire test reports, thermal performance data, and cleanroom compliance documentation provided

Custom engineering - thicknesses from 50 to 100 mm, galvanized/stainless/printed steel facings, and non-standard widths on request

Export experience - panels crated and packed for long-distance ocean freight, with installation guidance for overseas projects

Fast lead times - streamlined production scheduling for phased project delivery

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Frequently Asked Questions (FAQ)

Q: Which core is best for a pharmaceutical GMP cleanroom? A: Rock wool and MgO rock wool panels are most common - both deliver A-grade fire performance, smooth cleanable surfaces, and compliance documentation required in GMP audits.

Q: Which panel is lightest for suspended ceilings? A: Aluminum honeycomb and fire-retardant paper honeycomb panels offer the lowest weight - ideal for wide-span ceiling grids and fast installation.

Q: Can panels be used in humid or washdown areas? A: Yes. Magnesium oxysulfide (MOS) and MgO grid panels provide the best moisture resistance for wet-process and washdown environments.

Q: Do you provide fire rating certificates for export? A: Yes. We supply fire performance test reports and technical datasheets with every order to support local approvals and third-party inspection.

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Need a recommendation for your specific project? Send us your room layout, fire code requirements, and target cleanliness class - our engineering team will propose the optimal core material, thickness, and panel system within 24 hours.

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