Accurate Flexural Stiffness Testing for Corrugated Board & Packaging
The 4PF-50 4-Point Bending Stiffness Tester is designed to quickly and accurately measure the flexural stiffness of corrugated cardboard and board packaging in accordance with ISO 5628.
Flexural stiffness is a critical property of corrugated board, influencing the structural strength, stacking performance and Box Compression Test (BCT) performance of finished packaging. The 4PF-50 applies a controlled four-point bending load while precisely measuring specimen deflection within the elastic range.
With a robust, high-stiffness test frame, precision electromechanical drive and computer-controlled measurement system, the 4PF-50 provides reliable and repeatable results for quality control, laboratory testing and research & development.
Key Features
- 1 kN maximum test force
- Supplied with 500 N load cell
- ±0.5% force accuracy (Class 0.5)
- 0.001 mm displacement resolution
- Test speeds from 0.5 to 1,000 mm/min
- Precision servo motor and ball-screw drive
- High-stiffness single-column test frame
- Closed-loop control of force, displacement and crosshead movement
- Large, accessible testing area
- Multiple selectable measurement units
- Automated test data acquisition and analysis
- Comprehensive test reporting and PDF generation
- METROTEST testing software and Mini PC included
METROTEST Testing Software
The included METROTEST software provides intuitive computerised control of the 4PF-50, with real-time monitoring of test parameters, graphing, data analysis and report generation.
Key functions include:
- Automatic data acquisition and result storage
- Real-time force and displacement curves
- Automatic graph scaling and curve analysis
- Standard and reference curve comparison
- Configurable test limits
- Automatic specimen-by-specimen result saving
- Customisable test reports
- PDF report generation
- Basic statistical analysis
- Selection of force and deformation units
- Test database management
Technical Specifications
| Specification | 4PF-50 |
|---|---|
| Maximum machine force | 1 kN |
| Standard load cell | 500 N |
| Force resolution | 0.005 N |
| Force accuracy | ≤ ±0.5% |
| Displacement resolution | 0.001 mm |
| Crosshead travel | 500 mm |
| Test speed range | 0.5–1,000 mm/min |
| Test speed accuracy | ≤ ±1% |
| Maximum return speed | 1,000 mm/min |
| Adapter spacing | 500 mm |
| Power supply | 220 V / 50 Hz or 110 V / 60 Hz, single phase |
| Approx. power consumption | 400 W |
| Operating temperature | 10–35°C |
| Relative humidity | 20–80% |
| Test frame dimensions | Approx. 420 × 670 × 950 mm |
| Net weight | Approx. 76 kg |
Applications
The 4PF-50 is suitable for testing:
- Corrugated board
- Cardboard boxes
- Corrugated packaging
- Board packaging materials
- Packaging materials used in quality control and R&D
Standards
The 4PF-50 is designed for testing in accordance with ISO 5628 and is also compatible with relevant requirements of ISO 7500-1, ASTM E4, EN 10002-2, BS 1610, DIN 51221 and ISO 6892.
Standard Supply
The standard system includes:
- 4PF-50 4-Point Bending Stiffness Tester
- 500 N load cell
- Four-point flexure testing fixture
- METROTEST multilingual testing software
- Mini PC with Windows operating system
- Test results database and basic statistical analysis package
Reliable Corrugated Board Flexural Stiffness Testing
The 4PF-50 combines precision force and displacement measurement with automated software control to provide a reliable solution for evaluating the bending stiffness and structural performance of corrugated board and packaging materials.