Due to the very large number of tests offered, descriptions of those most commonly requested have been gathered into the following groups:

ASTM D5179 – Tensile Testing of Organic Coatings to Plastic Substrates

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ASTM D5179 testing 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. Touchstone is also able to perform the technically equivalent method ISO 4624 Pull-off Adhesion Testing of Paints and Varnishes.

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.

Please email or call (304) 547-5800 for information regarding test procedures, results, specimen information, pricing or any other ASTM D5179 questions you may have.

References: ASTM D5179 – Standard Test Method for Measuring Adhesion of Organic Coatings to Plastic Substrates by Direct Tensile Loading. ISO 4624: Paints and Varnishes – Pull-Off Test for Adhesion