ASTM F904 Test Fikstürü

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ASTM F904 – Standard Practice for Separation of Plies for Bond Strength of Laminated Flexible Materials

 

ASTM F904 describes techniques for separating plies of laminates made from flexible materials such as cellulose, paper, plastic film, and foil to enable

the measurement of the bond strength or ply adhesion of the laminate.

This includes laminates made by various processes: adhesive laminates, extrusion coatings, extrusion laminates, and coextrusions.

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ASTM F904 / Significance and Use

Laminates are made by bonding together two or more layers of material or materials, where each layer might be a single or multi-layer material.

When the bonding agent is reactive and requires time to reach full performance, the bond strength is typically measured as a green (un-cured) bond and a cured

bond.

For processes that intentionally create a nonlaminated edge, that edge is generally used to initiate the bond strength measurement.

The techniques described in this practice can be used to initiate separation of plies when a non-laminated edge is not present.

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ASTM F904 / Apparatus

Grips—A gripping system that minimizes both slippage and uneven stress distribution is required.

Grips lined with thin rubber, crocus cloth or pressure sensitive tape, as well as file-faced or serrated grips have been successfully used for many materials.

Air-actuated grips have been found advantageous, particularly in the case of materials that tend to “neck” in the grips, since pressure is maintained at all times.

Testing Machine—A tensile testing machine conforming to the requirements of Test Method ASTM D882.

Specimen Cutter—In accordance with Test Method ASTM D882.

*** Before conducting ASTM F904 , it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.

 

***PARSROS  offers several types of grips and fixtures which will enable you to perform a variety of tests

  that are accurate and repeatable.