Packaging is not just a protective layer; it’s a critical component that can directly impact patient safety and product integrity.

A secure and reliable seal prevents contamination, maintains sterility, and preserves the efficacy of medical devices.

Seal strength testing is a crucial quality control step in the medical device packaging field, ensuring that seals meet the high standards necessary for the healthcare industry.


What is the purpose of testing the seal?

The primary purpose of seal strength testing is to verify that the seals on medical device packaging are strong enough to withstand various stresses and conditions during transportation, storage, and handling, without compromising the sterility and quality of the enclosed medical devices.

Seal Strength Testing Methods

Several methods are used to test the strength of seals in medical device packaging, including:

  • Peel testing
  • Burst testing
  • Tensile testing

Peel Testing

Peel testing is a widely used method in the assessment of seal strength for various types of packaging, especially medical device packaging.

This method involves applying a controlled force to separate two sealed surfaces, typically at a 90-degree angle, simulating the process of opening the package.

Peel testing provides valuable insights into the integrity of the seal. It assesses whether the seal is uniform and consistent along its length, as an uneven seal can lead ttray sealero weak points that compromise package integrity.

A well-sealed package should require a consistent and adequate force to open, ensuring the contents remain protected until intentionally accessed.

Beyond assessing the seal’s strength, peel testing also helps evaluate its resistance to tampering or unauthorized access. Peel testing helps verify that such tamper-evident features function as intended.

Burst Testing

This method assesses the package’s ability to withstand internal pressure changes without rupturing.

During burst testing, the sealed package is subjected to an increase in internal pressure. This pressure is gradually applied until the package fails, i.e., the seal ruptures. The pressure at which this failure occurs is recorded.

Burst testing is a critical quality control measure for packages that must maintain their integrity under specific conditions.

Tensile Testing

Tensile testing evaluates the strength of the sealed edges of a package and measures the force required to pull them apart. This method is essential for packages that require a strong seal to prevent accidental tearing or opening.

Tensile testing provides a quantitative measure of the seal’s strength along the sealed edges. This is particularly important for packages that need to withstand rough handling during shipping and distribution.

Packages holding fragile devices that need seals that are resistant to tearing or damage during transit. Tensile testing helps ensure the packaging can withstand these challenges.


The Significance of Seal Strength

Patient Safety

The primary goal of medical device packaging is to safeguard patients from contamination and infection.

A weak seal can lead to breaches in sterility, potentially causing harm to patients who rely on these devices for their health and well-being. 

Preventing Contamination

Medical devices often come into contact with sensitive areas of the body or are used in sterile environments, such as surgical procedures.

A weak or compromised seal on the packaging of these devices could lead to contamination, which may result in infections or complications for patients. Ensuring the integrity of seals through testing helps prevent such issues and protects patient health.

Regulatory Compliance

Medical device packaging must adhere to strict regulations and standards set in the medical field. Seal strength testing is often a mandatory requirement to demonstrate compliance with these standards.

Compliance with these regulations helps ensure that only safe and effective medical devices are available to healthcare providers and patients.

Seal strength testing is the key patient safety and product integrity in the medical device packaging field.

It ensures that medical devices are delivered to healthcare providers and patients in a safe and reliable condition.

By doing so, they not only protect patients but also their own reputation and bottom line, contributing to the overall betterment of healthcare worldwide. Contact our team today to learn more!