ISO 7765 Dart Drop Impact Testing for Plastic Films
ISO 7765 is a standard test method used to measure the impact resistance of plastic films. The test measures the energy required to puncture the film with a specified diameter ball at a specified velocity.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
ISO 7765 Dart Impact Testing Overview
ISO 7765 is an international standard for determining the impact resistance of plastic films and thin sheets by measuring the energy required to cause failure using a free-falling dart method. It is widely used in flexible packaging to evaluate how materials behave under sudden impact.
The test simulates real-world conditions such as dropping, handling, or transportation damage. It determines the impact failure mass (g) at which 50% of specimens fail, providing a reliable measure of toughness and durability for films typically less than 1 mm in thickness.
Scope, Applications, and Benefits
Scope
ISO 7765 testing evaluates:
- Impact resistance (dart impact strength)
- Failure energy and mass (g)
- Resistance to puncture and rupture
- Toughness of thin films (<1 mm)
- Material performance under dynamic loading
Applications
- Flexible packaging films (PE, PP, multilayer films)
- Stretch wrap and shrink films
- Agricultural and industrial films
- Food packaging materials
- Plastic sheets and laminates
Benefits
- Simulates real-life drop and impact conditions
- Ensures packaging durability and safety
- Enables comparison between film grades
- Supports quality control in manufacturing
- Improves material selection for packaging
ISO 7765 Test Process
Sample Preparation
Film specimens are cut and clamped securely in a circular holder.
1Dart Drop Setup
A hemispherical dart (38 mm or 50 mm diameter) is selected based on method.
2Impact Application
The dart is dropped from a fixed height (0.66 m or 1.5 m) onto the specimen.
3Data Analysis
Dart mass is adjusted using staircase method to determine 50% failure mass.
4ISO 7765 Technical Specifications
| Parameter | Details |
|---|---|
| Standard | ISO 7765-1 (free-falling dart), ISO 7765-2 (instrumented puncture) |
| Applicable Materials | Plastic films and sheets (<1 mm thickness) |
| Dart Diameter | 38 mm (Method A), 50 mm (Method B) |
| Drop Height | 0.66 m (Method A), 1.5 m (Method B) |
| Output Units | Dart mass causing 50% failure (grams) |
| Method Type | Staircase statistical method |
Instrumentation Used for Testing
- Falling dart impact tester
- Dart heads and calibrated weights
- Specimen clamping fixture
- Drop height adjustment system
- Analytical balance
- Data recording system
Results and Deliverables
- Dart impact strength (failure mass in grams)
- Impact resistance classification
- Pass/fail performance under defined conditions
- Comparative analysis across film grades
- Material suitability for packaging applications
- Report
Frequently Asked Questions
ISO 7765 is a standard that determines the resistance of plastic films and thin sheets to sudden impacts. In other words, the test determines whether the plastic film can withstand the impact of the falling dart at the drop spot without tearing.
This test is conducted on thin plastic films, typically those that are less than 1 mm in thickness. You can expect polyethene (PE), polypropylene (PP), multi-layer packaging films, and other flexible plastic films made from polymers to be part of the test.
This test measures the amount of dart weight required for breaking or puncturing half of the specimens. In other words, the puncture and impact resistance of the films are being measured.
Through this test, manufacturers are able to determine the puncture resistance of their films, thus ensuring that their films are able to withstand handling, transportation, and storage.
This test is commonly applied in various industries such as general packaging, food packaging, agricultural films, medical packaging, and the plastic film industry.
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