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ASTM D2659 Tensile Strength Testing for PET Bottles
Tensile strength testing per ASTM D2659 ensures PET bottles meet mechanical performance requirements for filling, capping, and distribution. This article details the testing protocol and acceptance criteria.
Test Method Overview
ASTM D2659 Standard Test Method for Bursting Strength of PET Bottles:
- Test Equipment: Instron universal testing machine
- Load Cell: 5kN capacity, ±0.5% accuracy
- Crosshead Speed: 50 mm/min
- Sample Size: Minimum 10 bottles per batch
Mechanical Performance Specifications
- Top Load Strength: ≥250N (500ml), ≥180N (300ml)
- Burst Pressure: ≥400 kPa for carbonated beverage bottles
- Drop Test Height: 1.8m onto concrete (full bottle)
- Creep Resistance: ≤5% deformation after 24h at 80% top load
Stress-Strain Curve Analysis
Key mechanical properties extracted:
- Yield strength: 48-55 MPa
- Ultimate tensile strength: 52-58 MPa
- Elongation at break: 50-150%
- Young’s modulus: 2.8-3.2 GPa
Failure Mode Analysis
✓ Brittle fracture: indicates over-crystallization
✓ Ductile failure: normal behavior
✓ Stress cracking: chemical compatibility issue
✓ Base push-out: mold temperature problem
Quality Acceptance Criteria
AQL 2.5 sampling per ISO 2859-1 with Cpk ≥1.33 for critical mechanical properties.
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