In the following procedures, a piece of tape or adhesive is bonded to a standard material and peeled backwards at a degree angle. The main calculation determined through this ASTM standard is average peel or stripping strength. The information contained here is meant to explain the basic test procedure and provide details on the equipment required. A specimen consists of a flexible adhesive capable of folding back and peeling at a degree angle as well as a substrate material to bond the adhesive to.
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ASTM D provides guidance on testing standard-sized specimens at precisely controlled test machine speed. Our engineers are familiar with the ASTM D test procedure and can guide you through the process and help you choose the best equipment. We also recommend that you purchase the ASTM D standard and follow it closely to achieve the best results. This includes cutting your adhesive samples into specific sized strips and conditioning the samples.
We offer an ASTM D sample cutter so that you can cut the strips easily to the exact size you need. Now make sure you have your ten samples ready, alongside a rigid substrate that they can stick to. Depending on the product you are testing, this rigid substrate can be anything from metal to wood, glass and more. Place the specimen in the test machine by clamping one free end of the substrate in one grip.
Set the machine at a rate of six inches per minute and pull at least one half of the specimen to measure the adhesive bond strength. Peel force is measured in pounds per inch where inch is the length of the peel line.
Advice From Our Engineers A key issue that many people encounter when testing to ASTM D, is that both sides of the adhesive specimen can accidentally touch each other after placing the specimen into the grips.
If this occurs, the friction of that touching will cause errors in the peel force data. To avoid errors in your data, you must slightly offset the upper and lower grips to ensure the flexible adherent does not touch back on itself.
It is also important to align the specimens perpendicular in the grips so that the peel line is straight across. If the adherent is set on an angle, that will cause an error. A final key element of ASTM D to remember is that you need a substrate rigid enough such that it does not bend, or else the rubbing problem will occur. The P consists of a vertical load frame, an electromechanical actuator, load cell, a tocuhpad test controller, XY test software and peel grips.
For ASTM D, we would configure a small capacity load cell 10 or 25 pound for this low force peel test. A 10 lb load cell can be calibrated to measure 0.
The peel plot will be an important aspect of data retrieval and therefore we highly recommend our XyPlot software. If you would rather see the data in real-time and study the peel interface at the same time, we would provide you with our XyLive Software. For faster testing results we offer our G Pneumatic Grips. These types pneumatic grips are also helpful in getting the specimen well-aligned in the grips to avoid the rubbing issue highlighted above due to the foot activator giving you both hands free to hold the specimen.
It is not easy to hold the specimen exactly perpendicular in the grips while you are cranking a manual vice grip. Give one of our engineers a call today and they can help guide you through the ASTM D test process with the best machine configuration for your requirements.
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