ISO 7765-1

Free Falling Dart Method

Adopting ISO 7765-1 and using the free falling dart method empowers material and packaging professionals to accurately assess dart impact resistance, ensuring that films meet durability and safety standards. ISO 7765-1 is ideal for plastic films and sheeting used in packaging, agriculture, medical, and industrial applications.

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ISO 7765-1 and Its Importance

Understanding and implementing ISO 7765-1 is crucial for professionals working with plastic films and flexible materials. This international standard outlines the procedure for determining the dart impact resistance of a plastic film using the free falling dart method, an essential quality control test. Accurate application of this method helps manufacturers assess how well materials can withstand impact loads—an indicator of durability and performance in real-world applications. For industries like packaging, pharmaceuticals, electronics, and food, adhering to ISO 7765-1 ensures reliability, consistency, and compliance with global standards.

Understanding the Free Falling Dart Method

ISO 7765-1 specifies a test method to determine the energy required to cause failure in plastic films by the impact of a free-falling dart. The test identifies the impact failure mass, defined as the dart mass causing 50% of test specimens to fail under standardized conditions.

There are two principal procedures:

Method A uses a 38 mm diameter dart dropped from 0.66 meters.
Method B employs a 50 mm diameter dart dropped from 1.5 meters.

Each method caters to different material types and thicknesses, and the results obtained are not interchangeable.

Free Falling Dart Method: Importance and Procedure

Test Preparation

Before performing the test:

Condition specimens at 23°C ± 2°C and 50% ± 5% RH for at least 40 hours.
Select specimens with uniform thickness (±10% of nominal).
Use 30 or more samples to ensure statistical relevance.

Equipment Requirements

A standard test setup includes:

A dart with hemispherical head and removable incremental weights.
An electromagnet or mechanical release mechanism for controlled drop.
A two-piece clamping system to hold the specimen firmly.
A micrometer for precise thickness measurement.
Safety shielding to protect users and the apparatus.

Executing the Dart Impact Resistance Test

1. Choose the Test Method (A or B):

Method A: 38 mm dart, 0.66 m drop height.
Method B: 50 mm dart, 1.5 m drop height.

2. Prepare and Clamp the Specimen:

Ensure the film lies flat without wrinkles. Use anti-slip measures like crocus cloth or abrasive paper if needed.

3. Set the Dart and Incremental Weights:

Start with a known mass and increase or decrease it based on failure results until 50% failure rate is determined.

4. Release the Dart:

Use the electromagnet or air-release to drop the dart vertically on the center of the specimen.

5. Record the Outcome:

Note whether the specimen fails (pierced or ruptured) or survives. Continue until you can statistically calculate the impact failure mass.

6. Analyze Results:

Evaluate results considering sample thickness, material consistency, and failure rate. ISO 7765-1 results can be useful for material comparison but should not be normalized across varying thicknesses.

Why Choose Impacttesting.net’s
FDT-01 Dart Drop Tester

To ensure precision, repeatability, and compliance with ISO 7765-1, we recommend the FDT-01 Dart Impact Tester by Impacttesting.net.

Accurate dart drop height adjustment.
Easy specimen mounting with pneumatic clamps.
Real-time impact data collection and analysis.
Compliance with both Method A and Method B.

Its advanced safety features and digital controls minimize human error and ensure reliable, reproducible results—making it a go-to for packaging film producers, converters, and quality control labs.