ASTM F904

Test Materials: ASTM F904 specifies that the materials tested should be laminated flexible materials, commonly used in packaging, such as films, foils, and papers. The materials should be prepared by bonding multiple layers to simulate typical laminate structures. These laminates are usually subjected to various environmental conditions during testing to evaluate bond strength.
Test Process: The test involves applying a tensile force to the laminated materials until the bond between layers fails. A specific test setup, including a suitable testing machine, is used to measure the force required for separation. The samples are conditioned at a controlled temperature and humidity before testing, and the procedure follows standardized grip and pulling rates to ensure consistency.
Test Result Interpretation: The bond strength is determined by measuring the force per unit width of the laminate needed to separate the layers. The results are expressed in units of force, typically in pounds per inch (lb/in) or newtons per millimeter (N/mm). Higher values indicate stronger bonds, whereas lower values suggest weaker laminates or adhesive bonds that might not meet performance requirements.