Pharmaceutical airlock doors are hermetically sealed door systems engineered for GMP cleanroom environments where particle control, pressure cascades, and regulatory compliance are mandatory. The door leaf uses AISI 304 or 316L stainless steel skins, or PU sandwich panel skins, finished to a surface roughness of Ra ≤0.8μm to resist microbial retention and withstand repeated chemical disinfection.
The door leaf is insulated with high-density polyurethane foam at 40-45 kg/m³ density and thermal conductivity of ≤0.024 W/(m·K), supporting stable cleanroom temperature and humidity control. Air leakage at the closed door is held to ≤0.1 m³/h for ISO 5 (Grade A/B) zones and ≤0.3-0.5 m³/h for ISO 7-8 (Grade C/D) zones at the specified pressure differential.
Standard personnel airlock doors measure 800-900mm wide by 2,100mm high for single leaves, with material airlock double leaves available at 1,200-1,800mm width. Tempered glass observation windows of 400x600mm with aluminum frames allow visual monitoring. Door pairs are interlocked so both leaves cannot open simultaneously, preserving the pressure cascade between adjacent GMP grades.
These pharmaceutical airlock doors serve Grade A/B aseptic filling rooms, Grade C corridors, Grade D support areas, airlocks, pass-through hatches, and material transfer zones. They are engineered to meet EU GMP Annex 1 and FDA 21 CFR Part 211 expectations, maintaining a minimum 10 Pa pressure differential between grades and surviving VHP, IPA, and peracetic acid disinfection cycles.
Your Trusted Manufacturer for Pharma Airlock Door
RaxPanel is a direct manufacturer of pharmaceutical airlock doors based in Hebei, China, with over 15 years of continuous production experience. Our in-house R&D, precision fabrication, and surface treatment capabilities deliver consistent hermetic sealing, surface finish, and interlock reliability for GMP-regulated facilities worldwide.
With a daily production capacity exceeding 1,700 m² and exports to more than 50 countries and regions, RaxPanel combines scale with strict quality control to support EU GMP Annex 1 and FDA compliance documentation. Every door is supplied with material certificates, surface finish measurements, and installation qualification protocols for audit readiness.
- AISI 304 or 316L stainless steel skins with surface roughness Ra ≤0.8μm.
- PU foam core at 40-45 kg/m³ with thermal conductivity of ≤0.024 W/(m·K).
- Air leakage ≤0.1 m³/h for ISO 5 zones; interlocked door pairs preserve pressure cascades.
- Compliant with EU GMP Annex 1 and FDA 21 CFR Part 211 requirements with full IQ/OQ documentation.
| Parameter | Value |
|---|---|
| Skin Material | AISI 304 / 316L stainless steel; PU sandwich panel |
| Surface Finish | Ra ≤ 0.8 μm (electropolished or mechanically polished) |
| Core Material | High-density PU foam |
| Core Density | 40-45 kg/m³ |
| Thermal Conductivity | ≤ 0.024 W/(m·K) |
| Door Thickness | 50 / 60 / 80 / 100 mm |
| Single Leaf Size | 700-900 mm wide × 2,100 mm high |
| Double Leaf Size | 1,200-1,800 mm wide × 2,100 mm high |
| Observation Window | 400×600 mm tempered glass, aluminum frame |
| Air Leakage | ≤0.1 m³/h (ISO 5); ≤0.3-0.5 m³/h (ISO 7-8) |
| Pressure Differential | ≥10 Pa between adjacent grades |
| Interlock | Mechanical/electrical; both doors cannot open simultaneously |
| Seal System | EPDM / silicone gaskets, hermetic compression seal |
| Chemical Resistance | Compatible with VHP, IPA, peracetic acid |
| Compliance | EU GMP Annex 1; FDA 21 CFR Part 211; ISO 14644 |
Pharma Airlock Door Buying Guide & FAQ
Selecting the right pharmaceutical airlock door requires understanding GMP zoning, hermetic sealing, surface finish, interlock logic, and chemical resistance. This guide answers the most common questions from EPC contractors, validation engineers, and pharma facility managers evaluating cleanroom doors for aseptic and regulated environments.
1. When is 316L stainless steel required for pharma airlock doors?
316L is specified in corrosive environments or where chloride-based cleaning agents are used, thanks to its molybdenum content that resists pitting corrosion. For most dry cleanroom applications, 304 stainless steel with Ra ≤0.8μm polished finish meets GMP requirements at lower cost while remaining fully cleanable and chemically compatible.
2. Why are airlock doors interlocked?
EU GMP Annex 1 requires that both doors in an airlock cannot open simultaneously, preserving the pressure cascade that prevents particle migration between grades of different cleanliness. Mechanical or electrical interlocks enforce this sequence, while visual indicators and emergency egress override balance GMP compliance with life-safety code requirements.
3. Why does surface roughness Ra ≤0.8μm matter?
Rougher surfaces trap particulates and microbes in microscopic peaks and valleys that resist mechanical wiping and disinfection. A polished finish at Ra ≤0.8μm creates a smooth, non-retentive surface that is fully cleanable, supports repeatable sanitization, and withstands the audit scrutiny expected in Grade A/B aseptic environments.
4. Which disinfection agents must pharma doors withstand?
Doors must survive repeated exposure to vaporized hydrogen peroxide (VHP), isopropyl alcohol (IPA), and peracetic acid used in GMP sanitization protocols. Gasket materials, seals, and surface coatings are selected for chemical compatibility to prevent swelling, cracking, or degradation that would compromise hermetic sealing over the service life.
5. What pressure differential is maintained between GMP grades?
EU GMP Annex 1 specifies a minimum 10 Pa pressure differential between adjacent grades, with the cleaner grade held at higher pressure to prevent ingress of less-clean air. Hermetic door sealing and air-leakage rates of ≤0.1 m³/h for ISO 5 zones ensure the cascade remains stable even during door operation cycles.