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Sterilization Methods for Medical Plastic Bottles
Medical plastic bottles require sterilization to meet aseptic processing requirements. This article compares sterilization methods and their impact on PET materials.
Sterilization Methods Comparison
| Method | Dose/Conditions | PET Compatibility |
|---|---|---|
| Gamma Radiation | 25-40 kGy | Good (minor yellowing) |
| E-Beam | 25-30 kGy | Excellent |
| EtO (Ethylene Oxide) | 450-600 mg/L, 37-55°C | Excellent |
| Steam (Autoclave) | 121°C, 15 psi, 30 min | Poor (deformation) |
Gamma Radiation Effects
- Dose Range: 25 kGy (sterility assurance level 10⁻⁶)
- Color Change: Δb-value +2 to +5 (slight yellowing)
- Mechanical Properties: ≤10% change in tensile strength
- Molecular Weight: Minor chain scission, IV reduction ≤0.05 dL/g
EtO Sterilization
- Cycle time: 12-18 hours including aeration
- Residual EtO: ≤1 ppm (ISO 10993-7)
- No material degradation
- Excellent for heat-sensitive products
Aseptic Processing Requirements
✓ ISO 13485 medical device quality management
✓ Clean room filling (ISO Class 7 or better)
✓ Sterility testing per USP <71>
✓ Endotoxin testing: ≤0.5 EU/mL
Validation Documentation
Sterilization validation per ISO 11137 (radiation) or ISO 11135 (EtO) with dose mapping and biological indicators.
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