Cleanroom Sandwich Panel Acceptance Testing: Pressure Decay, Smoke Test & Surface Inspection
? 1. Pressure Decay Test
Purpose
Verify the cleanroom sandwich panel system is air-tight and can maintain pressure differential.
Procedure:
Seal all openings (doors, vents, penetrations)
Pressurize the room to 50Pa using a blower door
Isolate the blower and measure the pressure drop
Record the pressure after 15 minutes
Acceptance Criteria:
Cleanroom Class | Maximum Pressure Drop (15 min) |
|---|---|
ISO 5 | <10Pa |
ISO 6 | <15Pa |
ISO 7 | <20Pa |
ISO 8 | <30Pa |
Failure Points:
Joint sealant gaps — especially at corners
Door frame gaps
Utility penetrations (pipes, cables) not sealed
How to Fix:
Apply additional PU sealant at leak points
Use a cleanroom sandwich panel with flush joint for better sealing
Seal all penetrations with fire-stop putty
? 2. Smoke Test (Particle Challenge)
Purpose
Visually identify air leakage paths in the cleanroom sandwich panel system.
Procedure:
Generate a visible smoke source (e.g., smoke pen or fog machine)
Move the smoke source along all joints, corners, and penetrations
Observe if smoke is drawn into or out of the room
Mark all leak points with tape
Acceptance Criteria:
No visible smoke infiltration at joints
No smoke escaping from the room through panel gaps
Failure Points:
Cleanroom sandwich panel with flush joint — if sealant is not continuous
Corner profiles not sealed
Ceiling-to-wall joints
How to Fix:
Re-seal all marked points with PU sealant
For persistent leaks, use a cleanroom sandwich panel with stainless steel skin with better edge sealing
? 3. Surface Inspection
Purpose
Verify the cleanroom sandwich panel surface is clean, smooth, and free of defects.
Inspection Checklist:
Item | Acceptance Criteria |
|---|---|
Surface flatness | No visible bowing or warping |
Scratches | No deep scratches (>0.1mm) |
Stains | No oil, grease, or chemical stains |
Joint smoothness | Cleanroom sandwich panel with flush joint — no step or ledge |
Sealant quality | Continuous, smooth, no bubbles |
Corner radius | R30 or R50 radius, sealed |
Measurement Tools:
2m straightedge for flatness
Surface roughness tester (Ra ≤ 0.8µm for GMP)
Lux meter for lighting uniformity (not panel-related but often checked)
? 4. Documentation Requirements
For GMP Compliance:
Mill certs for all cleanroom sandwich panel batches
Fire test certificates
Coating thickness reports
Installation records with photos
Pressure decay test results
Smoke test video or photos
From SAMZOON:
As a cleanroom sandwich panel Foshan manufacturer, SAMZOON provides full documentation with every shipment:
Mill certs
Fire test certificates (EN 13501-1, GB 8624)
Coating thickness reports
Cleanroom sandwich panel installation guide
? 5. SAMZOON: Acceptance-Ready Panels
SAMZOON manufactures cleanroom sandwich panel systems designed to pass acceptance testing the first time:
Cleanroom sandwich panel with flush joint — seamless sealing
Cleanroom sandwich panel with rockwool core — A-grade fire protection
Cleanroom sandwich panel with stainless steel skin — VHP-resistant surface
Cleanroom sandwich panel with antimicrobial coating — hospital-grade surface
Cleanroom sandwich panel with PIR core — cold room insulation
Cleanroom sandwich panel with magnesium oxide core — high-load walls
Cleanroom sandwich panel with aluminum honeycomb core — lightweight ceilings
