Falling Dart Impact Test: ASTM D1709 Procedure, Method & Applications

When a plastic film or flexible packaging material looks strong, does that always mean it can handle a sudden impact?

Not necessarily.

A plastic film may have good tensile strength but still fail when a sharp or heavy object hits it suddenly. This is why impact testing is important for many plastic films, sheets and flexible packaging materials.

The falling dart impact test is used to study how a plastic film or sheet behaves when a dart is dropped onto its surface from a specified height. The test helps laboratories and manufacturers understand the impact resistance of the material and compare different plastic films.

For manufacturers of packaging materials, plastic films and polymer products, this type of testing can be useful for quality control, product development and material comparison.

What Is a Falling Dart Impact Test?

The falling dart impact test is a method used to determine the impact resistance of plastic film or sheet material.

In simple terms, a dart or impact weight is allowed to fall onto a test specimen. The impact can cause the film to break, puncture or remain intact depending on the material and test conditions.

The test is especially useful when the material may experience sudden impact during:

• Packaging
• Transportation
• Handling
• Storage
• Manufacturing
• Product use

The test results can help manufacturers compare different grades, thicknesses or formulations of plastic film.

What Is ASTM D1709?

ASTM D1709 is a commonly referenced test method for determining the impact resistance of plastic film by the free-falling dart method.

The method is widely associated with plastic film testing and is useful for comparing the impact performance of flexible films.

The exact test configuration, specimen preparation and calculation method should always follow the applicable standard and the testing requirements of the laboratory.

For Indian manufacturers and testing laboratories, using the applicable standard helps maintain consistency between tests and makes results easier to compare.

How Does the Falling Dart Impact Test Work?

The basic principle is simple.

A plastic film specimen is held securely in the test fixture. A dart with a defined mass or configuration is allowed to fall onto the specimen.

The test is repeated using suitable test conditions to determine whether the film fails or withstands the impact.

Depending on the selected test method and procedure, the dart mass or test condition can be adjusted to determine the impact performance of the film.

The important point is that the test is not simply about dropping a weight onto plastic. The specimen preparation, fixture arrangement, dart configuration, drop height and test procedure all affect the result.

Falling Dart Impact Test Procedure

A typical testing process involves the following steps:

1. Prepare the Test Specimen

Plastic film samples are prepared according to the applicable test method.

The specimen should be free from unnecessary damage, folds or contamination that could affect the result.

2. Fix the Film in the Tester

The film is placed and clamped properly in the test fixture.

Good specimen holding is important because movement during impact can influence the test result.

3. Select the Test Condition

The appropriate dart configuration, mass and drop condition are selected according to the test method and material being evaluated.

4. Release the Dart

The dart is released from the specified position so that it impacts the film.

5. Observe the Result

The specimen is checked to determine whether it has failed or withstood the impact.

6. Repeat the Test

Additional specimens are tested according to the required procedure.

The resulting observations are then used to determine the impact performance of the material.

What Does the Falling Dart Impact Test Measure?

The test is mainly used to evaluate the resistance of plastic film to sudden impact.

It can help answer questions such as:

• How easily does the film fail under sudden impact?
• Which film formulation has better impact resistance?
• Does increasing film thickness improve impact performance?
• Is a new packaging film stronger than the previous material?
• Is the material suitable for its intended packaging application?

The result is particularly useful when impact during handling or transportation is a concern.

Why Is Falling Dart Testing Important for Plastic Films?

Plastic films are commonly used in packaging, industrial products and consumer applications.

During transportation and handling, packaging may experience drops, impacts, pressure and contact with other objects.

A film that performs well during normal handling may still fail under sudden impact.

Falling dart testing provides an additional way to evaluate this behaviour.

For manufacturers, the test can support:

• Quality Control
• Material comparison
• New product development
• Packaging development
• Supplier evaluation
• Incoming material inspection
• Production consitency

Applications

Falling dart impact testing can be useful in several industries.

Flexible Packaging

Packaging films need to withstand handling and transportation. Impact testing can help evaluate whether a film is suitable for its intended use.

Plastic Film Manufacturing

Film manufacturers can compare different materials, thicknesses and production conditions.

Polymer Industry

The test can support evaluation of different polymer film formulations.

Packaging Material Development

When a new packaging film is developed, impact testing can provide useful information about its mechanical performance.

Quality Control Laboratories

Testing laboratories can use impact testing as part of a broader plastic material evaluation program.

Research and Development

R&D teams can compare materials during product development and material selection.

Falling Dart Impact Test vs Tensile Test

These two tests answer different questions.

A tensile test measures how a material behaves when it is pulled.

A falling dart impact test evaluates how the film responds to a sudden impact.

For example, a film can have good tensile strength but still show poor impact resistance.

Therefore, using both tests can provide a more complete understanding of plastic film performance.

What Factors Can Affect the Test Result?

Several factors can influence impact testing results.

Film Thickness

Thickness can have a significant effect on impact performance. Films with different thicknesses should be compared carefully.

Material Composition

Different polymers and formulations can behave differently during impact.

Specimen Preparation

Poor specimen preparation can affect the reliability of results.

Test Conditions

The dart configuration, drop condition and test arrangement should be controlled according to the selected method.

Sample Orientation

Some films can show differences depending on the direction of the specimen.

Environmental Conditions

Temperature and other environmental conditions may affect plastic behaviour.

For accurate comparison, testing conditions should remain consistent.

How to Choose a Falling Dart Impact Tester?

Before purchasing a falling dart impact tester in India, consider the actual testing requirement.

Test Standard

First determine which standard your laboratory needs to follow, such as ASTM D1709 or another applicable method.

Material Type

Tell the manufacturer whether you are testing plastic film, flexible packaging, polymer sheets or another material.

Test Range

The required dart mass and testing range should match your material and test procedure.

Fixture Arrangement

The specimen holding arrangement should be suitable for the size and type of samples being tested.

Result Recording

Depending on laboratory requirements, digital indication or data recording may be useful.

Customization

If your laboratory has a special specimen size or testing requirement, discuss the requirement with the machine manufacturer before ordering.

Falling Dart Impact Tester for Indian Laboratories

Indian plastic manufacturers, packaging companies and testing laboratories may require different configurations depending on their products.

A small laboratory may need a compact testing arrangement, while a production or R&D laboratory may require additional fixtures or data recording.

Therefore, the machine should be selected based on:

• Material Type
• Sample dimensions
• Applicable test standard
• Required test range
• Laboratory workload
• Reporting requirements
• Future testing requirements

Instead of selecting a machine only by price, it is better to first define the testing method and sample requirements.

Common Mistakes During Falling Dart Testing

Some simple mistakes can reduce the reliability of test results.

Using Damaged Specimens

Cuts, folds or scratches can influence failure.

Incorrect Clamping

The film must be held properly in the fixture.

Comparing Different Thicknesses Without Considering Thickness

A thicker film may naturally behave differently from a thinner film.

Changing Test Conditions

Changing the dart or test setup between tests makes comparison difficult.

Ignoring the Applicable Standard

The testing procedure should be based on the standard required for the application.

Frequently Asked Questions

What is a falling dart impact test?

It is a test used to evaluate the impact resistance of plastic film or sheet by allowing a dart or impact weight to fall onto the specimen.

What is ASTM D1709 used for?

ASTM D1709 is associated with determining the impact resistance of plastic film using a free-falling dart method.

Is falling dart testing the same as tensile testing?

No. Tensile testing evaluates the behaviour of a material under tensile loading, while falling dart testing evaluates resistance to sudden impact.

Which materials can be tested?

The method is commonly associated with plastic films and flexible sheet materials. The suitability should be confirmed according to the applicable test standard and material.

Why is impact resistance important for packaging film?

Packaging can experience sudden impacts during manufacturing, handling, transportation and storage. Impact testing helps evaluate how the film responds to such conditions.

How do I select a falling dart impact tester?

Start with your test standard, material type, specimen size, required test range and laboratory requirements. These details help determine the appropriate tester configuration.

Conclusion

The falling dart impact test provides a practical way to evaluate how plastic films respond to sudden impact. For packaging manufacturers, plastic film producers and testing laboratories, the test can support material comparison, quality control and product development.

ASTM D1709 is an important reference when the applicable testing requirement calls for the free-falling dart method. However, the correct machine configuration should always be selected according to the required test method and specimen requirements.

If you are planning to purchase a Falling Dart Impact Tester in India, discuss your material type, sample dimensions and testing standard with the manufacturer before finalizing the machine.

Need a Falling Dart Impact Tester?

Innotech Engineering Devices Private Limited supplies testing equipment for laboratories, manufacturers and quality-control applications in India. Machine configurations can be discussed according to the required testing method and application.

Contact Innotech Engineering Devices Private Limited

Website: www.innotechgroup.net
Email: info@innotechgroup.net
Mobile: 9810431604

Contact the team with your test requirement to discuss a suitable Falling Dart Impact Tester configuration.