90 Degree and 180 Degree Peel Test In daily life, have you noticed that some product labels peel off easily, while others tear, leave adhesive residue, or simply refuse to come off at all? For flexible packaging, this manifests as some packages opening effortlessly, while others prove difficult to open. Behind these everyday products lies a crucial test: peel testing. Peel testing measures the bond strength between materials, ensuring adhesives perform as intended in real-world applications. The most common testing methods are the 90-degree peel test and the 180-degree peel test. Although they share the same principle, they are suited for different material characteristics. Let’s explore the 90-degree peel test and the 180-degree peel test together. What is Peel Testing? Peel testing is a method that applies force at specific angles and speeds between materials, simulating stresses encountered in real-world

environments. It measures the adhesive strength of films, labels, pressure-sensitive adhesives, and tapes, finding widespread use in packaging, food, medical, and electronics industries. 90-Degree Peel Test The 90-degree peel test is more suitable for semi-rigid or rigid substrates. Since these materials cannot bend, this test better reflects real-world conditions. This test concentrates stress at the adhesive interface, enabling precise detection of localized defects. It is commonly used to evaluate the adhesion performance of pressure-sensitive labels and tapes on rigid substrates. 180-Degree...

rigid substrates at a 90-degree angle, while the 180-degree peel test separates flexible materials at a 180-degree angle. 2. Different Test Materials The 90° peel test is more suitable for semi-rigid or rigid materials, while the 180° peel test is more suitable for flexible materials. 3. Different Stress Distribution The 90° peel test mainly concentrates on stress distribution, whereas the 180° peel test has a more uniform stress distribution. Why the Peel Test Matters? Conducting the appropriate peel test accurately assesses a material’s adhesive performance under varying conditions, identifies...

and 180-degree peel tests in accordance with industry standard testing methods, providing precise and reliable data support. Contact our experts for more information about the product. Conclusion Conduct peel testing on materials to determine their bond strength, ensuring they meet expected performance, enhance user experience,

and guarantee product quality. For detailed information on these two peel testing methods — including test procedures, standards, and applicable equipment — read the complete guide here: 90° vs 180° Peel Test for Adhesive Streng