In industries that rely on adhesives, seals, and bonded materials, ensuring strong and durable adhesion is crucial. Whether in packaging, automotive, medical devices, or construction, testing the strength of adhesive bonds is an essential quality control step.

Peel strength testing, seal strength testing, and bond strength evaluation provide accurate insights into how well materials adhere under stress. To maintain product integrity, safety, and performance, manufacturers use advanced peel test equipment to measure the force required to separate bonded surfaces.

This blog explores peel strength testing, seal integrity testing, bond strength assessment, and their role in quality assurance (QA) and research & development (R&D).

What is Peel Strength Testing?
Peel strength testing is a mechanical method used to determine the adhesive strength between two bonded surfaces. It measures the force needed to peel one material from another, providing data on adhesion quality, durability, and performance.

Factors Affecting Peel Strength
Several factors influence peel strength, including:

• Type of adhesive – pressure-sensitive, heat-sealed, or chemically bonded
• Material composition – plastic, metal, paper, or fabric
• Bonding technique – lamination, coating, or welding
• Environmental conditions – temperature, humidity, and mechanical stress

By conducting peel adhesion testing, manufacturers can ensure reliable adhesive performance, minimizing failures in real-world applications.

Types of Peel Tests and Their Applications
Different testing methods are used based on the material type and application requirements.

1. 90-Degree Peel Test

• One end of the bonded material is peeled at a 90-degree angle.
• Used for labels, coatings, films, and adhesive tapes.

2. 180-Degree Peel Test

• The bonded material is peeled completely backward at a 180-degree angle.
• Commonly used for laminated materials, foil packaging, and flexible bonds.

3. Mechanical Peel Test

• Evaluates bond strength under controlled force conditions.
• Ideal for automotive, aerospace, and construction applications.

Each test provides critical data for evaluating adhesion quality, ensuring that materials meet industry standards and durability expectations.

Seal Strength Testing: Ensuring Packaging Integrity
Seal strength testing determines the force needed to break or peel a sealed joint, particularly in packaging applications. The integrity of a sealed package is crucial in industries such as food, pharmaceuticals, and medical devices, where contamination prevention is essential.

Importance of Seal Strength Analysis for QC
A seal integrity test ensures that packaging remains airtight and leak-proof, preventing spoilage, contamination, and product damage. By evaluating seal strength, manufacturers can:

• Verify adhesive or heat-seal consistency
• Detect weak seals or defects
• Improve packaging durability and transport safety
• Meet regulatory compliance standards

Using peel test equipment, a manufacturer can perform seal strength analysis for QC, ensuring packaging reliability in storage and transit.

Bond Strength Testing: Evaluating Adhesion Performance
Bond strength testing assesses the force required to separate two bonded materials, whether through adhesives, welding, or chemical bonding. This is critical in industries like automotive, aerospace, medical devices, and electronics, where structural integrity is essential.

Factors Affecting Bond Strength

• Material type – metal, plastic, composite, or fabric
• Bonding method – adhesive, fusion welding, or lamination
• Surface preparation – cleaning, priming, or roughness enhancement
• Environmental exposure – heat, humidity, and mechanical stress

Using a bond strength tester, manufacturers can accurately measure material bond strength, ensuring high-quality, long-lasting adhesion.

Peel Force Measurement: How It Works
Peel force measurement determines the force required to separate a bonded material, expressed in Newton per meter (N/m) or pounds per inch (lbs/in). It helps manufacturers evaluate:

Adhesive durability over time

• Resistance to peeling under external forces
• Bond quality under different environmental conditions

A peel adhesion tester provides precise data for R&D, production monitoring, and quality control, helping manufacturers enhance product performance and customer satisfaction.

Why Choose Pacorr’s Peel Test Equipment?
Pacorr specializes in high-precision testing instruments designed for accurate adhesion and bond strength evaluation.

• Key Features of Pacorr’s Testing Instruments
• High accuracy & repeatability
• User-friendly operation with digital control
• Compliance with international testing standards
• Customizable testing parameters for diverse applications

Pacorr’s peel test equipment helps industries achieve consistent quality assurance, ensuring that adhesives, seals, and bonds meet required durability and performance standards.

Applications of Peel, Bond, and Seal Strength Testing
Industries that rely on adhesive and bond strength testing include:

• Packaging Industry – Ensuring seal integrity for food, pharmaceuticals, and flexible packaging
• Automotive Industry – Evaluating adhesion of coatings, laminates, and bonded components
• Medical Devices – Verifying sterile seal strength in medical packaging and tubing
• Electronics – Testing adhesive tapes, films, and PCB coatings
• Construction & Aerospace – Measuring structural bond strength in composites and materials

By conducting peel strength testing, manufacturers can prevent adhesive failures, improve product safety, and enhance material performance in real-world conditions.

Peel strength testing, seal strength analysis, and bond strength evaluation are essential for ensuring strong, durable adhesive bonds in various industries. By using advanced peel test equipment, manufacturers can maintain quality control, regulatory compliance, and product reliability.

At Pacorr, cutting-edge peel strength testers and seal integrity testing instruments are designed to meet global testing standards, helping industries achieve superior product performance.

For more information on peel strength testing solutions, visit Pacorr.com today!