MECHANICAL TESTING

Adhesion of Organic Coatings to Plastic by Direct Tensile - ASTM D5179

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ASTM D 5179 covers the determination of organic coatings (such as paint and varnish) adhesion to a plastic substrate. It can be used to evaluate the adhesion (pull-off strength) of various coating/substrate combinations. Typically an aluminum stud is adhered to a coated panel, then the stud and panel are placed in a tensile test machine and the bonded joint is subjected to tensile loading until failure.

Proper sample preparation should be followed closely to ensure a good bond between the aluminum block or stud and the coated substrate. Flat planer stud surfaces are critical to good adhesion and test results. Touchstone has extensive experience in sample preparation and bonding techniques, which are critical to obtaining accurate results.

We routinely perform this test utilizing procedures as stated in ASTM D 5179 as well as ASTM C297 - Standard Test Method for Flatwise Tensile Strength of Sandwich Constructions.

The coated substrate is adhesively bonded between two bead blasted and chemically cleaned, pinned aluminum blocks or cylinders. If a cyanoacrylate adhesive is used, a cure time of no less than two hours at room temperature should be allowed prior to testing.

The pinned blocks should be adhered to the coated substrate at 0 and 90 degrees, top to bottom. The blocks are placed and pinned into a self aligning fixture and loaded at a constant crosshead speed of 2.0 in/min.

Reference: ASTM D5179 - Measuring Adhesion of Organic Coatings to Plastic Substrates by Direct Tensile Loading

Index of Mechanical Testing