Shrinkage Testing Machine for Plastic Sheet

Shrinkage Testing Machine for Plastic Sheet

What is Shrinkage Testing?

Shrinkage testing measures the dimensional changes of materials when exposed to heat. This test is crucial for understanding how materials, especially plastic sheets, behave under thermal stress. By evaluating shrinkage, manufacturers can predict how materials will perform in real-world applications, ensuring quality and reliability.

Definition and purpose

Shrinkage testing involves heating a material, such as a plastic sheet, to a specific temperature and measuring the resulting dimensional changes. The purpose is to assess the material’s thermal stability and predict its behavior during processing or in end-use conditions.

Typical materials tested (focus on plastic sheets)

While various materials can undergo shrinkage testing, plastic sheets are commonly tested due to their widespread use in packaging, electronics, and medical devices. Understanding the shrinkage properties of plastic sheets helps ensure they maintain integrity and performance under thermal stress.

Importance of shrinkage testing in various industries

Shrinkage testing is vital in industries where material performance and reliability are critical. In packaging, it ensures that plastic films and sheets do not deform, compromising the product’s protection. In electronics, it prevents materials from shrinking, which could lead to component misalignment and failure.

General applications for plastic sheets

Plastic sheets are used in packaging, medical devices, electronics, and construction. Their performance under heat is essential, making shrinkage testing a key quality control step.

Shrinkage Testing Machine by Cell Instruments

ASTM D2732 Shrinkage Testing Machine for Plastic Sheet

Features of the Machine

Cell Instruments offers a state-of-the-art shrinkage testing machine designed to deliver high precision and reliability. Key features include:

  • Precise P.I.D. Temperature Control: Ensures accurate temperature regulation during testing.
  • High-Precision Timer: Provides exact timing control for test consistency.
  • Consistent Fluid Medium Heating: Guarantees uniform heating for reliable results.
  • Alarm Capability: Alerts users to any deviations or issues during testing.
  • Standard Square Metal Clamp and Free Shrink Holder: Facilitates secure sample placement.
  • Customizable Settings for Various Test Requirements: Adaptable to different materials and testing needs.
  • User-Friendly Interface and Automation Capabilities: Simplifies operation and improves efficiency.
  • Equipped with an Oil Bath Cover: Ensures safety and uniform heating.

Technical Specifications

Sample Size ≤160 mm x 160 mm
Temperature Range Ambient ~ 200°C
Accuracy ±0.3°C
Dimension 37*44*28 LWH cm
Power Supply 220V 50Hz

ASTM D2732 Shrinkage Testing

Standard Test Method for Unrestrained Linear Thermal Shrinkage of Plastic Film and Sheeting


ASTM D2732 specifies the standard method for determining the unrestrained linear thermal shrinkage of plastic film and sheeting. This standard provides a consistent approach to evaluating shrinkage, ensuring reliable and comparable results.

ASTM D2732 outlines the necessary procedures and requirements for conducting shrinkage tests, including sample preparation, equipment setup, and test execution. Adhering to this standard ensures that tests are performed accurately and consistently.

Detailed Test Procedure

Sample preparation

Prepare the plastic sheet samples according to ASTM D2732 guidelines. This involves cutting the samples to specified dimensions and conditioning them as required.(100mm*100mm by standard)

Equipment setup

Set up the shrinkage testing machine by calibrating the temperature controls and ensuring all components are in place, including the square metal clamp and shrink holder.

Step-by-step test execution

  1. Place the sample in the machine using the standard square metal clamp.
  2. Set the desired test temperature and start the test.
  3. Monitor the sample as it heats and records the dimensional changes.
  4. Once the test is complete, measure the final dimensions of the sample.

Measurement and data analysis

Analyze the data by comparing the initial and final dimensions of the sample to determine the percentage of shrinkage. This information helps evaluate the material’s thermal stability.


To calculate the unrestrained linear shrinkage percentage using the given formula:
Unrestrained Linear Shrinkage (%) = [(Lo – Lf) / Lo] x 100
Lo = Initial length (100 mm)
Lf = Length of the side after shrinking

Applications and Benefits

Industries Benefiting from Shrinkage Testing

Industries such as packaging, medical devices, electronics, and construction benefit from shrinkage testing. It ensures materials meet performance standards, enhancing product quality and reliability.

Advantages of Using Cell Instruments’ Shrinkage Testing Machine

Cell Instruments’ shrinkage testing machine offers several advantages:

  • Enhanced Accuracy and Repeatability: Precise controls and consistent heating ensure reliable results.
  • Efficiency and Ease of Use: The user-friendly interface and automation capabilities streamline the testing process.
  • Comprehensive Data Reporting: Detailed data analysis provides valuable insights into material performance.
  • Customization Capabilities: Tailored solutions meet specific testing needs, ensuring versatility.

Customization Capabilities

Cell Instruments excels in providing customized testing solutions to meet specific industry needs. Our services include automation and transformation to enhance testing efficiency and adaptability.


1. What types of plastic sheets can be tested for shrinkage?

Our shrinkage testing machine is compatible with various plastic materials, including polyethylene, polypropylene, and polyvinyl chloride.

2. How does the machine ensure precise temperature control?

The machine uses precise P.I.D. temperature control to maintain accurate and consistent heating throughout the test.

3. Can the machine be customized for specific testing needs?

Yes, Cell Instruments offers customization options to meet specific testing requirements, ensuring versatility and adaptability.

4. What safety features are included in the shrinkage testing machine?

The machine is equipped with an oil bath cover and alarm capability to ensure safe operation and alert users to any issues.

5. How does Cell Instruments support the maintenance of the machine?

We provide comprehensive technical support, training, maintenance, and calibration services to ensure optimal performance of the equipment.

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