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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ASTM D2659 Tensile Strength Testing for PET Bottles – Quality Assurance Protocol