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Peel Strength Testing

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Peel strength is generally used to measure the bond strength of a material, typically an adhesive. Peel strength is the average load per unit width of bond line required to separate bonded materials where the angle of separation is 180⁰.

Protective coverings are commonly used as for various products and plastics film is normally used as the material. Often, these low peel force films are used to protect LCD screens and other scratch-prone surfaces. The force required to remove the film is very important for both the consumer and the manufacturer. The film must be easy to remove, yet the bond must be strong enough to remain intact for product security.

In the packaging industry, Peel Strength Testing measures the strength of seals within flexible barrier materials. This measurement can then be used to determine consistency within the seal, in addition to the evaluation of the opening force of the package system. Seal strength is a quantitative measure for use in process validation, process control and capability. Seal strength is not only relevant to opening force and package integrity, but to measuring the packaging processes’ ability to produce consistent seals.

Tensile tests are normally performed by a universal testing machine or its equivalent to test for seal strength. A section of the package seal is gripped between jaws (one movable and one fixed) and pulled apart at a controlled rate. The force or energy required to separate the two sealed surfaces gives an indication of the seal strength.

TEST STANDARDS:
• ASTM D903 - 98(2010) Standard Test Method for Peel or Stripping Strength of Adhesive Bonds
• ASTM D5170 - 98(2010) Standard Test Method for Peel Strength ("T" Method) of Hook and Loop Touch Fasteners
• ASTM B533 - 85(2009) Standard Test Method for Peel Strength of Metal Electroplated Plastics
• ASTM D3807 - 98(2012) Standard Test Method for Strength Properties of Adhesives in Cleavage Peel by Tension Loading (Engineering Plastics-to-Engineering Plastics)