Environmental Requirements for Pre-filled Syringe Filling Machine Workshop

Cleanliness Classification

· Critical Filling Zone (Grade A)

· Particle Standard (Dynamic): ≥0.5μm particles ≤3,520 particles/m³ (ISO Class 4.8)

· Microbial Limit: Airborne bacteria <1 CFU/m³; Settling bacteria <1 CFU/4h

· Airflow Pattern: Unidirectional vertical flow, velocity 0.45±0.1 m/s

· Background Zone (Grade B)

· Particle Standard (Dynamic): ≥0.5μm particles ≤3,520,000 particles/m³ (ISO Class 7)

· Microbial Limit: Contact plates <5 CFU/plate

Pressure Differential & Airflow Organization

· Pressure Gradient:

· Cleanroom vs. corridor ≥10 Pa

· Between different classification zones ≥5 Pa

· Airflow Direction: Grade A zone airflow unidirectional downward (to prevent cross-contamination)

· Air Changes: Grade B zone ≥60 changes/hour

Environmental Monitoring & Validation

· Real-time Monitoring:

· Particle counters (0.5μm + 5.0μm)

· Temperature/humidity sensors (±0.5°C/±3% RH accuracy)

· Pressure sensors (with audible/visual alarms)

· Validation Requirements:

· Initial validation: 3 cycles (static + dynamic), including microbial challenge testing

· Annual revalidation: HEPA filter leak test (PAO method, leakage rate <0.01%)

· Routine monitoring: Grade A continuous per batch; Grade B daily

Personnel & Material Control

· Personnel:

· Grade A max 2 persons; Grade B max 4 persons

· Aseptic gowning (full-body suits in Grade B, glove disinfection every 30 minutes)

· Material Transfer:

· Sterile pass-through box/VHP (vaporized hydrogen peroxide) sterilization

· External packaging cleaning (75% ethanol or sterile IPA wiping)

Additional Requirements for Special Products

· Biologicals: Endotoxin monitoring (<0.25 EU/m³)

· Cell Therapy Products: CO₂ concentration control (5%±0.5%)

· Light-sensitive Products: Low-light operation (<100 Lux)

Typical Compliance Parameters

· Filling accuracy: ≤±1%

· Sterility Assurance Level (SAL): ≤10⁻⁶

· Annual environmental non-compliance rate: <0.5%