Dart Drop Impact Test: A Complete Guide Based on ASTM D1709

Understanding the dart drop impact test is crucial for evaluating the impact resistance of plastic films used in packaging, medical devices, and consumer goods. This method helps determine the energy required to rupture a film sample under controlled conditions. In this article, we’ll walk through the test methodology as specified in ASTM D1709, discuss equipment selection, and provide insights into impact testing machine price to support purchasing decisions.

What Is a Dart Drop Impact Test?

The dart drop impact test is designed to measure the impact resistance of plastic films by dropping a hemispherical dart from a specific height until 50% of the specimens fail. This energy value is used to quantify the durability of the film, especially in packaging applications.

This method is defined by ASTM D1709, which outlines two procedures:

Method A: Uses a 38.10 mm diameter dart dropped from 0.66 m
Method B: Uses a 50.80 mm diameter dart dropped from 1.52 m

Each method suits different film thicknesses and material types, offering a reliable way to assess toughness under real-world conditions.

Why Dart Drop Impact Testing Matters

Understanding the impact strength of plastic films is essential in applications such as:

Pharmaceutical blister packs
Medical device pouches
Flexible food packaging
Industrial liners and barrier films

Poor impact resistance can lead to film rupture during shipping or handling, compromising product safety. The dart drop impact test is a non-negotiable step in quality control for plastic film manufacturers and converters.

Key Features of ASTM D1709 Procedure

Here’s a simplified overview of the key steps in ASTM D1709:

Test Setup

Select the dart (Method A or B) based on sample type.
Measure film thickness accurately.
Condition samples at 23°C ± 2°C and 50% ± 10% RH for at least 40 hours.
Clamp the film uniformly without folds or imperfections.

Staircase Method (Preferred)

Begin with a dart weight close to the expected failure point.
Increase or decrease weight after each test based on failure or pass.
Continue testing until 10 failures and 10 non-failures are recorded.

Alternative Method

Use groups of 10 specimens per dart weight.
Change weight in consistent increments across groups.
Calculate the impact failure weight (WF) using either tabular or graphical methods.

Factors Affecting Accuracy

To ensure valid results, consider the following:

Sample uniformity: Thickness variations affect energy absorption.
Dart positioning: Ensure the dart strikes the center of the sample.
Clamping integrity: Avoid film slippage or damage during clamping.
Environmental control: Temperature and humidity must be stable.

A deviation in any of these parameters can introduce significant error into the results.

Impact Testing Machine Price and Selection Guide

When choosing a machine, impact testing machine price can vary depending on features like:

Drop height range
Dart diameter compatibility
Precision in weight adjustment
Automated data recording and analysis
Compliance with ASTM and ISO standards

Prices typically range from USD 5,000 to 15,000 depending on capabilities. For labs focused on compliance, automation, and long-term reliability, investing in a high-quality system pays off.

Recommended Equipment: FDT-01 Falling Dart Impact Tester

For laboratories and quality control teams seeking ASTM D1709 compliance, Cell Instruments’ FDT-01 is a highly recommended solution. It offers:

Support for both Test Method A and B
Precision-controlled drop mechanism
Quick setup with automated data logging
Stable clamping to reduce test variation

Whether you are a film manufacturer or a third-party lab, the FDT-01 ensures repeatable and accurate dart drop results.

Applications Across Industries

Industries that rely heavily on the dart drop impact test include:

Packaging: Stand-up pouches, shrink wrap, and vacuum packaging
Medical: Sterile barrier films, diagnostic strip pouches
Food & Beverage: Frozen food bags, beverage liners
Pharmaceutical: Unit-dose blister films, sachets

Reliable impact resistance supports regulatory compliance and customer satisfaction.

Final Thoughts

The dart drop impact test is a critical tool for evaluating film durability and ensuring packaging reliability. By following ASTM D1709 standards and selecting the right equipment, manufacturers can produce high-quality, impact-resistant films.

For advanced testing needs, the FDT-01 Dart Drop Tester from Cell Instruments delivers precision, efficiency, and full compliance. Understanding the procedure and investing in the right solution enhances both product safety and market competitiveness.