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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Sterilization Methods for Medical Plastic Bottles: Gamma Radiation vs. Ethylene Oxide