Common Non-Conformities of Rock Wool Panels During Cleanroom Acceptance
2026-08-17
Q: What frequent unqualified issues of rock wool panels appear during cleanroom completion acceptance?
A: The main problems cover raw material defects and irregular installation. Typical issues include fiber leakage from rock wool core, incomplete seam sealing, damaged panel surfaces, improper material selection and unqualified fireproof documents. These defects affect cleanliness indicators, fire safety and lead to acceptance suspension. Below we sort out high-frequency problems, causes and countermeasures one by one.
⚠️ Top 8 Common Unqualified Items On Site
1. Fiber shedding & fiber leakage from rock wool panel cut sections 🧱
Phenomenon: Tiny rock wool fibers drift out from plate ends, holes and gaps, causing particle count exceeding standard.
Root Cause: Adoption of ordinary rock wool core without anti-shedding treatment; random on-site cutting without edge sealing.
Solution: Choose clean low-shedding rock wool panels; finish fixed-size cutting in factory and seal all cross-sections. Minimize secondary cutting on construction site.
2. Discontinuous, cracked or inadequate sealant on panel joints 🧴
Phenomenon: Cracks exist between tongue-and-groove joints, air penetrates and dust accumulates inside the wall cavity.
Root Cause: Poor construction workmanship, inferior sealant or insufficient width of glue seam.
Solution: Adopt purification-specific neutral anti-mold sealant; form continuous, uniform glue lines during installation; conduct full visual inspection before airtightness testing.
3. Surface dent, scratch and coating corrosion of metal panels 🪞
Phenomenon: Scratches on galvalume plates gradually rust; pits and dead corners are difficult to disinfect and gather microorganisms.
Root Cause: Rough transportation and installation; frequent disinfection with strong oxidants on ordinary coated panels.
Solution: Protect panels during handling; use 304 stainless steel rock wool panels for high-frequency disinfection zones.
4. Wrong model: external wall rock wool panels used for indoor clean partitions 🏗️
Phenomenon: The surface structure is not suitable for clean environment, forming dust hiding space.
Root Cause: Cost-driven material mixing without distinguishing indoor and outdoor panel types.
Solution: Clarify installation position before ordering; indoor clean area must select dedicated internal partition rock wool panels.
5. Uneven panel flatness, obvious dislocation at splicing joints 📏
Phenomenon: Uneven wall surface forms dead corners, violating GMP and cleanroom design specifications.
Root Cause: Low precision of panel production; lack standardized positioning during hoisting.
Solution: Select manufacturers with mature forming technology; adjust verticality and flatness synchronously when fixing rock wool panels.
6. Incomplete supporting fire inspection documents 🔥
Phenomenon: The provided test report cannot match the thickness, density and core material of delivered rock wool panels.
Root Cause: Suppliers use old reports or materials from different batches.
Solution: Confirm in advance that manufacturers can supply complete, matching formal inspection certificates.
7. Unreasonable opening treatment for lamps, air outlets and pipelines 🔌
Phenomenon: Rough holes without wrapping, rock wool core exposed directly to clean space.
Root Cause: Random drilling without auxiliary edge wrapping accessories.
Solution: Prefer factory reserved openings; wrap all on-site drilled edges and seal tightly.
8. Serious gap between panels and ground, ceiling, wall corners 📐
Phenomenon: Unsealed gaps become air exchange channels between clean zone and auxiliary area.
Root Cause: Inaccurate measurement before production; neglect of closing details in construction.
Solution: Strengthen on-site measurement; adopt matching corner accessories and seal all peripheral gaps.
💡 Practical Suggestions For Project Control
- Material inspection before delivery: Conduct sample comparison to verify rock wool core quality and surface sheet condition.
- Intermediate inspection: Check sealing quality panel by panel during installation, do not wait until final acceptance for rectification.
- Clarify technical requirements in the contract: Mark clean grade, anti-fiber-shedding requirement, panel type and supporting documents clearly.
SAMZOON is a local original manufacturer based in Foshan. We are familiar with cleanroom acceptance standards for medical, pharmaceutical and electronic purification projects across South China. We supply clean-grade rock wool panels, customized stainless steel composite panels, support urgent production and free sample delivery. Our engineering team provides pre-sales material selection consultation and on-site construction standard suggestions to help you avoid common acceptance obstacles. If you are preparing procurement plans for your clean workshop, welcome to contact us for technical support.
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