Handmade rock wool sandwich panels

1. Basic Definition & Process Differences

1. Structure: Double-sided face sheets (color-coated steel/304/316L stainless steel) + Grade A1 non-combustible rock wool core, edge-sealed with galvanized steel strip/aluminum alloy keel, compounded and cured by manual pressing. Different from the continuous assembly line of machine-made panels, it supports custom non-standard dimensions and reinforced frames, with better air tightness and flatness.
   Compliance Standards: GB/T 29468-2024 (Cleanroom Sandwich Panels), GB 8624 Grade A1 Non-combustible, JGJ/T453.
2. Handmade vs Machine-made Panels

   Comparison Item	Handmade Rock Wool Panel	Machine-made Rock Wool Panel
   Precision & Sealing	Tight joints, interlocked with middle aluminum profiles, suitable for cleanroom positive pressure areas	Assembly line joints, mostly used for general workshops
   Non-standard Customization	Pre-reserved doors/windows/air outlets, thickened frames, double magnesium oxide compounding available	Fixed specifications, on-site cutting easy to generate dust
   Cost	Relatively high (labor + process)	High cost performance
3. Standard Specifications: Effective width 980/1180mm; Thickness 50/75/100/150mm; Custom length on demand (≤6m for conventional); Face sheet thickness 0.4–0.8mm (0.5–1.0mm for stainless steel); Rock wool bulk density ≥120 kg/m³ (recommended for cleanrooms, stable thermal insulation and strength); Thermal conductivity 0.038–0.044 W/(m·K)   
   

2. Core Performance & Technical Indicators

1. Fire Resistance: Grade A1 non-combustible, no melting and dripping, no toxic flue gas, meeting the highest fire protection requirements of pharmaceutical/semiconductor cleanrooms.
2. Air Tightness & Cleanliness: Side sealing + middle aluminum profile connection, maintaining a pressure difference of ≥10Pa; Surface roughness Ra≤0.8μm, dust-free, easy to clean, and resistant to disinfection with alcohol/hydrogen peroxide; Leak-free in PAO testing.
3. Bonding Strength ≥0.15MPa, no delamination; Hydrophobic rate ≥98%, moisture-proof and mildew-resistant.
4. Temperature & Humidity Resistance: Long-term stability at 22±2℃ and 45%–60%RH, suitable for cleanroom environments.

3. Typical Application Scenarios

• Cleanrooms: Wall and ceiling cladding for Class 100 (ISO 5) and all grades of cleanrooms; Auxiliary areas of pharmaceutical GMP Grade A/B, semiconductor lithography rooms, and enclosure of medical operating rooms.
• Industry: Fireproof workshops in chemical industry, precision instrument factories, fire partition zones in data centers.
• Public Facilities: Hospital ICUs, biosafety laboratories, clean corridors.

4. Key Points for Selection, Installation & Operation

1. Grade-based Selection:
   Core Class 100 areas → 304/316L face sheet + 120kg/m³ rock wool + double magnesium oxide compounding;
   Auxiliary Class 10,000/100,000 areas → color-coated steel + 100kg/m³ rock wool;
   Low bulk density rock wool (<100kg/m³) is strictly prohibited for cleanroom use.
2. Installation: Modular assembly, double sealing for internal/external corners, doors/windows, and wall-penetrating pipelines; Avoid cold bridges; On-site face sheet cutting is forbidden (completed in off-site clean processing areas).
3. Operation & Maintenance: Regular inspection of sealant aging, face sheet corrosion, and abnormal pressure difference; Focus on leak detection around filters; Annual PAO testing and bonding strength detection.
4. Replacement: Replace immediately if face sheet bulging, core moisture absorption, or bonding failure occurs.

5. Common Misunderstandings & Overseas Compliance Tips

1. Handmade panels do not equal zero dust source; cleanroom cleanliness relies on the combination of HEPA filters, unidirectional airflow, and personnel/material process control.
2. Rock wool cannot contact liquid directly and must be sealed with face sheets.
3. For export projects, Grade A1 fire test report, PAO leak test report, and VOC non-volatility certificate must be provided, complying with local standards (e.g., EU GMP, FDA cGMP, UL certification).