Measure Film Impact Resistance with ASTM D1709 Testing
ASTM D1709 is the internationally recognized dart impact test standard used to determine the impact resistance of plastic films through the free-falling dart method. The test measures the weight of a falling dart required to cause failure in 50% of tested specimens, providing a reliable indicator of film toughness, puncture resistance, and impact durability.
Manufacturers of flexible packaging, agricultural films, industrial liners, medical packaging, and consumer product packaging rely on ASTM D1709 testing to evaluate material performance under sudden impact conditions. By quantifying impact resistance, laboratories can optimize film structures, compare materials, verify production consistency, and ensure product quality before market release.
What Is ASTM D1709?
ASTM D1709, Standard Test Methods for Impact Resistance of Plastic Film by the Free-Falling Dart Method, establishes procedures for determining the impact resistance of plastic films using a hemispherical dart dropped from a specified height.
The test result represents the dart mass that statistically causes failure in 50% of specimens under controlled testing conditions.
The standard includes:
- Método de prueba A
- Método de prueba B
- Staircase Testing Technique
- Alternative Group Testing Technique
The method is widely used for quality control, product development, material comparison, and specification verification.
ASTM D1709 Test Principle
The test measures the impact energy required to rupture a film specimen.
A hemispherical dart is released from a specified height and impacts a clamped film sample. Based on whether the specimen passes or fails, the dart weight is adjusted according to the selected testing procedure.
After multiple drops, the system calculates the dart mass corresponding to a 50% probability of specimen failure.
The resulting value serves as a quantitative measure of impact resistance.
ASTM D1709 Test Method A vs. Method B
| Parameter | Método A | Método B |
|---|---|---|
| Dart Diameter | 38 mm | 50 mm |
| Drop Height | 660 mm | 1520 mm |
| Impact Resistance Range | Approximately 50 g to 6 kg | Approximately 300 g to 6 kg |
| Typical Applications | General packaging films | Higher-impact films |
| Weight Increment Guidance | Approximately 15% of failure weight | Approximately 5–15% of failure weight |
Método A
Method A uses:
- 38 mm hemispherical dart
- 660 mm drop height
This method is commonly used for:
- Polyethylene films
- Packaging films
- Stretch films
- Agricultural films
Método B
Method B employs:
- 50 mm hemispherical dart
- 1520 mm drop height
This configuration is suitable for:
- Heavy-duty films
- Industrial liners
- Thicker plastic structures
- High-strength packaging materials
ASTM D1709 Staircase Test Method
The staircase technique is the most commonly used procedure.
Testing Procedure
- Select Method A or Method B.
- Measure specimen thickness.
- Choose a starting dart weight near the expected failure point.
- Clamp the specimen securely.
- Release the dart.
- Record pass or fail.
- Adjust dart weight:
- Failure → decrease weight
- No failure → increase weight
- Continue testing until the required number of failures and non-failures is obtained.
- Calculate the 50% failure weight.
Advantages
- Efficient testing
- Reduced sample consumption
- High statistical reliability
- Excellent repeatability
Alternative Dart Drop Test Method
The alternative procedure evaluates specimens in groups of ten.
Procedure Overview
- Ten specimens are tested at one dart weight.
- Failure percentage is calculated.
- Dart weight is adjusted for subsequent groups.
- Testing continues until sufficient data points are collected between 0% and 100% failure.
This approach is often used when laboratories require a broader statistical evaluation of material performance.
Test Specimen Requirements
For reliable ASTM D1709 testing:
Preparación de las muestras
- Film should be free from wrinkles and folds.
- Surface contamination should be avoided.
- Samples should represent actual production material.
- Thickness should be measured and recorded.
Recommended Specimen Size
- Greater than 150 mm × 150 mm
Proper specimen preparation significantly improves test repeatability and reproducibility.
Why Perform a Dart Impact Test?
Plastic films are frequently exposed to impacts during:
- Packaging operations
- Transportation and logistics
- Warehousing
- Consumer handling
- Automated filling processes
A dart impact test helps manufacturers understand how a film behaves when subjected to sudden mechanical forces.
Key Benefits
- Evaluate film toughness
- Compare different resin formulations
- Verify production consistency
- Optimize multilayer film structures
- Reduce package failures during distribution
- Support product development and material selection
ASTM D1709 Falling Dart Impact Tester from Cell Instruments
Cell Instruments provides a professional Dart Impact Tester designed for ASTM D1709 compliance and routine laboratory testing.
Smart Technology Integration
PLC Control and Touchscreen Operation
- Industrial PLC architecture
- 7-inch HMI touchscreen
- Intuitive operation
Automatic Result Calculation
The system automatically calculates impact resistance values after pass/fail testing, reducing operator workload and minimizing calculation errors.
Electromagnetic Dart Release
- Stable dart suspension
- Consistent release conditions
- Improved repeatability
Pneumatic Sample Clamping
- Uniform specimen holding
- Reduced operator influence
- Improved testing consistency
Dual Test Method Capability
| Feature | Configuration |
|---|---|
| Método A | Estándar |
| Método B | Optional |
| Automatic Calculations | Yes |
| Pneumatic Clamping | Yes |
| Touchscreen Control | Yes |
Safety and Productivity Features
- Foot-switch operation
- Test activation button
- Observation lighting
- Optional micro-printer
- Optional software integration
Technical Specifications
| Artículo | Specification |
|---|---|
| Test Method | Method A / Method B (Optional) |
| Alcance de la prueba | Method A: 50–2000 g |
| Method B: 300–2000 g | |
| Dart Diameter | Method A: 38 ± 1 mm |
| Method B: 50 ± 1 mm | |
| Impact Height | 660 mm / 1500 mm |
| Accuracy | 0.1 g (0.1 J) |
| Clamping System | Pneumatic |
| Air Supply | 0.6 MPa |
| Specimen Size | >150 mm × 150 mm |
| Power Supply | AC 110–220 V, 50 Hz |
Choosing the Right Dart Impact Tester
When selecting an ASTM D1709 testing system, laboratories should consider:
- Compliance with ASTM D1709 requirements
- Method A and Method B support
- Automation level
- Data management capabilities
- Testing throughput
- Calibration and maintenance requirements
A modern dart impact tester helps improve testing efficiency while ensuring accurate and repeatable results for quality control and R&D applications.
ASTM D1709 remains one of the most important standards for evaluating the impact resistance of plastic films. Through standardized free-falling dart testing, manufacturers can quantify film toughness, improve product performance, reduce packaging failures, and maintain consistent production quality. Whether used for quality assurance, product development, or material comparison, a reliable dart impact tester is an essential tool for modern film testing laboratories.