The eXpert 7600 series single column testing machines are capable of performing tension, compression, flexure and peel/adhesion tests in an affordable and compact package. Efficient in design, units fit within a 431x520mm space with force capacities to 5kN. These machines also feature the industry’s largest vertical test space, making them ideal for testing high elongation materials. ADMET offers a full line of grips, fixtures, load cells, extensometers and heating and cooling systems. If your testing requires more than our standard systems offer, we can modify the stroke, speed or add a torsion actuator for biaxial tests to meet your needs.
Nanoengineered biomaterials from polymers and nanoclays continue to generate interest in biomedical and biotechnological applications due to their high water content, biocompatibility, and shear-thinning characteristics. In this study, the rheological implications between model clay and polymer system of poly(ethylene glycol) and Laponite for use in 3D bioprinting and cell delivery are investigated.
The ADMET eXpert 7600 Single Column Testing System equipped with 25 lb load cell was used for compression testing of 3D printed and cast (bulk) hydrogel. Strain rate of 1 mm/min was used to compress the samples 50% of original height. The compressive modulus was calculated and plotted to compare bulk versus 3D printed structures. Compressive modulus of print and cast hydrogels were compared and no difference was observed.
To Determine the Peel Strength of Medical Tape, ADMET Recommends eXpert 7601 Adhesive Testing System
Various medical and adhesive manufacturers follow ASTM and ISO testing standards before bringing surgical tape to market. The pressure-sensitive adhesive tape goes through a rigorous process of testing to ensure the material is strong and durable without causing harm to the patient.
Medical tapes are used primarily for first aid treatment and as a type of bandage or dressing for wounds. These tapes need to be hypoallergenic and allow oxygen to reach the skin, which is why surgical bandages are often created from cotton. Zinc oxide is added to these materials to prevent infection in patients. Many athletes also utilize these materials as a form of grip during their games.
Medical tape must be tested and analyzed to assess product quality, safety, reliability, and toxicity. ADMET provides a multitude of materials testing machines to determine the strength and properties of various adhesives. The list includes the eXpert 2600 Series static axial dual-column testing machines, the eXpert 5000 Series modular lower force testing machines, and the eXpert 7601 Adhesive Testing System.
ADMET systems are utilized by the adhesives sector to determine the peel strength, shear, and bonding properties of tapes and adhesives. The controllers available with the ADMET systems, such as the MTESTQuattroPC-based standalone unit or the eP2 digital controller, are able to average peel strength loads over a specified distance and simplify reporting through a variety of means.
Testing laboratories choose the MTESTQuattro software controller in order to receive powerful data storage capabilities along with impressive analysis and reporting tools. The eP2 controller, however, has been made for ease of use and shows results directly on the screen immediately after the test is completed.
A selection of grips and fixtures also offer users the ability to perform various peel tests and design their own experiments. These accessories include 90 degree peel fixtures, loop tack fixtures, and 180 degree grips for peel tests. All ADMET systems meet and exceed the requirements of ASTM and ISO accuracy standards. Some of these specifications include ASTM D1876 (Peel Resistance), ASTM D6195 (Loop Tack Release), and ASTM D903 (180 Degree Peel Strength Test). These testing machines can also be used to assess the seal strength of packages.
To determine the peel strength of medical tape, many adhesives manufacturing companies choose ADMET’s eXpert 7601 Adhesive Testing System, which allows users to perform many tests on a single machine. Our units are easy to use and can be tailored to your needs. Support services and on-site installation is also available. For more information about ADMET’s adhesive testing machines, contact [email protected] to speak with our Account Directors.
ADMET releases eXpert 7601 for Adhesive and Peel Testing
ADMET is pleased to announce the release of its eXpert 7601 testing machine specifically configured for Adhesive and Peel Testing. This machine has been designed to perform a wide variety of common adhesive and peel tests in a single compact and affordable package. The eXpert 7601 for Adhesive and Peel Testing will easily perform tests to the most popular standards as dictated by ASTM, ISO, TLMI, and PSTC. Users also have the ability to program their own custom test methods. Like all ADMET systems, the eXpert 7601 comes with your choice of digital controllers: the eP2 standalone controller or the PC-based MTESTQuattro.
Click here to learn more about the eXpert 7601 for Adhesive and Peel Testing and watch the video to see the it in action!
To learn more about the eXpert 7601 and other products and services ADMET offers, submit a Sales Inquiry or call us directly at (800) 667-3220.
Grips and extensometer for ASTM D1708 microtensile testing
Historically, test method ASTM D1708 has been used to measure the tensile and elongation properties of plastics that have little amount of material available. There are also many other ASTM test methods for specific materials (FEP, ETFE, PTFE) that reference the same test method a list of which is referenced below. A change has been made to the ASTM D1708 tensile specimen shape so that it now is the same as the shape found in ISO 12086-2. ASTM D1708 is no longer the preferred plastic microtensile method as ASTM recommends the much more common ASTM D638 tensile test using the very small type V specimen shape. If interested, another ADMET page discusses ASTM D638 here.
The convenient feature of D1708 is that the specimen shape is such that an extensometer is not required to perform the test. Rather, the universal testing machine’s built in jaw separation position is sufficient to measure elongation. It becomes critical however that you have a very accurate initial jaw separation which happens to be less than an inch.
Universal Testing Machine (UTM) of the constant-rate-of-crosshead-movement variety. I’m not aware of any manufacturer that makes anything but this type anymore. However, the UTM should be servo-controlled to maintain the set speed throughout the test.
Load Cell accurate to at least 1% of the reading. Also, the breaking strength of the material should be between 1/100th and the full capacity of the load cell. For example, a 100 lbf load cell should be used to measure from 1 – 100 lbf.
Tensile Grips of the “vise” or “side action” variety so as not to interfere with the elongation measurement. Serrated, plain, and rubber coated jaw faces can be used. Pneumatic grips of the “side action” type can also be used. Self-tightening grips such as eccentric roller and wedge styles are not good for this test. Eccentric roller grips are hard to set the jaw separation properly and wedge grips have the same problem but can also add an undesirable compressive load on the sample. Systems that adjust grip separation automatically to accommodate a compressive load then adjust the gauge length. It’s not tricky as it sounds if you use a simple pair of manual tensile vise grips.
The cost for a system that meets the accuracy requirements of the specification and include all the items above generally start at around $ 8,000 USD. Depending on vendor and options chosen, typical 1kN – 50 kN systems range in price from $8,000 – $ 40,000 USD. The major cost driver with these systems is the maximum force capacity of the system. 1 kN & 5 kN single column systems are sufficient for many materials when testing to a microtensile method and are the most cost effective. Larger capacity 10, 25, 50, 100 kN and higher dual column systems are also available that can perform this test as well and performing other high capacity tests.
Other Microtensile Test Methods:
ASTM D2166 Section 11.4 – Tensile Properties of FEP Fluorocarbon Molding and Extrusion Materials
ASTM D3159 Section 11.4 – Tensile Properties of Modified ETFE-Fluoropolymer Molding and Extrusion Materials
ASTM D4745 Section 12.4 – Tensile Properies of Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
ASTM D4894 Section 10.7 – Tensile Properties of Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
ASTM D4895 Section 10.7 – Tensile Properties of Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
Performing an ASTM D3167 Adhesive Floating Roller Peel Test
The floating roller peel test is one of many types of tests designed to measure the average peel force of an adhesive or other bonding agent. The other common peel tests are the 90 degree, 180 degree, and T-Peel. Although not suitable for every application, the floating roller is a very accurate and easy method to obtain average peel force values.
How do I know which peel test is best for my application?
There are two primary reasons. The first is that you want to test using a method that simulates the end use of your product. For example, when you peel a label off a product, you pull it off at an approximately 90 degree angle. Therefore, you should perform a 90 rather than a 180 degree peel. The second reason is that your materials may only lend themselves to certain types of tests. For example, a T-Peel test is used when both bonded substrates are flexible. This rules out the floating roller, 90 and 180 degree peel test. Each of those tests requires that one of the layers be rigid.
Why perform the floating roller peel test over the 90 or 180 degree peel?
All of these tests are very similar in that they separate a relatively flexible substrate that has been bonded to a rigid substrate. The 180 degree peel test means what it says – the flexible substrate is peeled at a 180 degree angle to the rigid substrate. The same for the 90 degree peel test. However, the floating roller allows the flexible substrate to be pulled apart gently from the rigid substrate as they are being separated over a 1″ mandrel. This is accomplished by using a specially designed floating roller peel fixture. The angle of separation is very gentle so it works well when the flexible substrate is not really that flexible and can’t be bent to a 90 or 180 degree angle.
Video of the test:
What is needed to perform this test?
A universal testing machine (tensile testing machine)
Needs to maintain a test speed of 6 inches per minute
Load of the test should fall within 15 and 85% of the full scale machine capacity.
The ADMET eXpert 7601 is one machine that is great for tests under 1kN of force (225 pounds). Sometimes this test is performed on a ADMET eXpert 2611 with 10kN (2000 pounds) of capacity.
New Heating and Cooling Chamber Allows Use of Long Travel Extensometer
At ADMET we pride ourselves in our ability to modify our standard systems to meet the specific requirements of every customer. Much of our product line has evolved in some way from a custom application. Today, we are excited to announce that single and dual column testing systems equipped heating and cooling chambers can now be paired with long-travel extensometers.
Until now, users testing specimens inside of heating and cooling chambers had been limited to clip-on extensometers. Although clip-on extensometers work well for most tensile tests, they are not ideal for high-elongation materials. Recently, a laboratory testing elastomers using an ADMET eXpert 7600 XLT with a long-travel extensometer saw the need to test their specimens under controlled environmental conditions. To meet their needs we extended the vertical testing space and viewing window, and shortened the depth of the F-280DT heating and cooling chamber to fit on the eXpert 7601 single column frame and surround our EX-900CT long-travel extensometer. The result was a compact, table-top testing system capable of accurately measuring specimen elongation under controlled temperature conditions.
ASTM D5458 Peel Cling of Stretch Wrap Film How to Guide
Stretch wrap film, commonly made from polyethylene plastic, is a clear packaging film normally used to wrap large or bulk items for transportation or warehousing purposes. ASTM D5458 is a testing standard designed to measure the “cling” between two layers of stretch wrap film. This is a relevant measurement because two or more layers of stretch wrap are usually in contact with each other. For example, stretch wrapped pallets require several layers of film to secure and are usually moved across, or transported on top of, other wrapped pallets. This post is designed to help you understand the test procedure and equipment needed to perform this test with certainty. When you are ready to test products to this standard, please refer to and follow the steps in the official ASTM specification.
This test requires a special fixture (shown below).
There are two types of samples to prepare. A large piece of film to go on the fixture, and smaller film strips of film that are attached to film clips. Make sure to carefully prepare each specimen as indicated.
Clamp the large film sample on the bottom of the incline of the fixture (outside face up).
Secure the loose end of the sample with the steel rod to create a smooth surface. If you wish to perform the test on a stretched piece of film:
a. Select your desired elongation %
b. Place the steel rod on the distance down the incline face that matches your desired elongation %
c. Roll and secure the loose end of the film on the steel rod in that position
d. Pull the rod back to stretch and clamp the film
Take a film strip sample (sandwiched between two pieces of paper for easier handling) and carefully press down .5 inches of the strip to the top of the incline. Make sure that the strip is parallel to the gridlines on the fixture.
Slide the pieces of paper and apply pressure to the rest of the film strip to create a smooth contact with the large sample.
Secure the end of the film strip closest to the bottom of the incline to the film clip.
Making sure data is being recorded; begin moving the crosshead upwards (the crosshead is connected to the film clip through a string and pulley).
Note the moment when the film strip begins to separate from the “cling line” demarcated on the fixture. The load at this moment is the cling strength of the sample.
Cling strength: load at which film begins to separate from the “cling line”.
Special ASTM D5458 fixture with incline, steel rod, clip, and pulley. ADMET can provide you with this exact fixture.
Tensile testing machine capable of servo control (constant rate of movement) equipped with a 500g load cell. All ADMET testing machines satisfy these requirements. We offer a full line of load cells. eXpert 7600 single column testing machine equipped with pulley fixture used for coeficient of friction tests (similar to ASTM D5458)
A testing controller capable of moving the crosshead at the specified rate and displaying load in real-time. Both MTESTQuattro, our most advanced PC based controller, and the eP2 Digital Controller, a standalone unit, are capable of displaying a load/position curve in real time.
MTESTQuattro (left) eP2 Digital Controller (right)
Hook and loop fastener strength test on a universal testing machine
Hook and loop (often times referred to by the trade name Velcro) fasteners are commonly tested through both a Peel Strength “T” Method (ASTM D5170) and Shear Strength Dynamic Method (ASTM D5169). Hook and loop fasteners are also used in applications where separation occurs purely in the tension direction. This video shows a test where an adhesive backed hook and loop fastener is adhered to a pair of compression platens mounted to a universal testing machine (tensile testing machine). The test has been designed so that in one test the hook and loop is loaded to 1 pound of force and then retracted to measure the bonding strength. It then continues to load to 10 pounds of force, then retract, then load to 20 pounds, then retract, and so on until 80 pounds of force. After the test is completed, the strength can be measured by analyzing the test report with load on the “Y” axis and time on the “X” axis.
This test was performed on an ADMET eXpert 7601 universal testing machine equipped with the most advanced materials testing software, MTESTQuattro. For more information on this or any other ADMET testing system please visit www.ADMET.com
90 Degree Adhesive Peel Strength Test on a Universal Testing Machine
This video shows a 90 degree adhesive peel strength test on an ADMET eXpert 7601 universal testing machine(tensile testing machine). We fit the eXpert 7601 with our 90 degree peel strength fixture and one vise grip on the top crosshead to hold the free end of the tape. The fixture has numerous tapped holes that allow you to clamp a multitude of various parts and substrates to the test bed. This test measures the maximum load and also the average load of adhesive tape bonded to a Polystyrene foam substrate. The average was taken after 1″ of displacement and continued through 6″ of displacement. Usually, the highest force is observed at the beginning of a peel test and then it levels out throughout the remainder of the test. Starting the average force calculation after 1″ removed the “starting force” from the average calculation.
ASTM D412 Tensile Strength Properties of Rubber and Elastomers
ASTM D412 (D 412) covers the tensile properties of thermoset rubbers and thermoplastic elastomers. The specification describes two test methods, A and B. Method A is common and can be performed on a universal testing machine (tensile testing machine). If you are going to perform this test, you should read the entire specification from ASTM. This is a quick summary to decide if this test is right for you and to point out what equipment you need to perform the test.
There is a wide variety of equipment that can perform the ASTM D412 test. The first video shows a typical system that is easy to use and has no comprimises. The second video shows a more simple setup that is commonly used by customers with less demanding requirements or perhaps budget limitations. The normal price range for a single column D412 system can range from $ 8,000 to $ 20,000 USD. We’ll help you configure a system to your needs and budget.
The ADVANCED ASTM D412 tensile testing machine: eXpert 7601 with extended height option, MTESTQuattro software, Long Travel Extensometer
The SIMPLE ASTM D412 tensile testing machine:
eXpert 7601, eP2 Digital Controller, eccentric roller grips
1. Cut or injection mold your material into a “dumbbell” shaped specimen.
2. Load the specimen into tensile grips.
3. Attach the optional extensometer to the sample
4. Begin the test by separating the tensile grips at a speed of 20 inches per minute
5. End the test after sample break (rupture)
1. Stress at user-specified extension or elongation
2. Tensile Yield Stress
3. Tensile Yield Strain
4. Tensile Strength at Rupture
5. Elongation at Rupture
1. Universal testing machine (tensile testing machine) with these minimum specifications:
A. Servo-controlled to keep a constant rate of speed during the test (+/- 2 inches/min)
B. At least 30 inches of crosshead travel or more for high elongation materials
C. Most small and common 1kN (225 pound) load capacity machines will work for the loads of the materials tested to this specification
All of our eXpert 2600 series dual column machines meet these requirements, and it is also common to use our single column eXpert 7601 XL with 53 inches of crosshead travel.
2. An extensometer is optional but recommended. We recommend one for two reasons. First, dumbbell specimens do not have uniform widths which cause errors when both the wide and narrow sections of the dumbbell shaped specimen elongate at different rates. Secondly, elongation is usually an important design characteristic of rubbers and elastomers so an extensometer can be used to improve accuracy of the measurement.
3. Software or suitable electronics are required to operate the machine and to take the measurements. Basic systems will provide the raw data, and stress-strain charts. Using these sources of data, you can determine and calculate all of the analysis listed above. However, fully PC based systems have the capability to calculate all of these automatically. For example, our MTESTQuattro testing software has built in support for ASTM D412 and all of these calculations are provided immediately after performing the test.
4. Tensile grips hold your specimen during the test as it is being
pulled apart. Elastomers pose a challenge to hold because they thin as they are stretchd. Therefore, the vast majority of elastomers need to be held with self tightening grips. Examples of these grips are eccentric roller grips, wedge grips, or pneumatic grips. Regardless of the grip design, the concept is the same – they tighten on the material as it thins to keep constant force on the sample.
In their study, National Institute of Health researchers describe the engineering of a bioinspired elastic and biocompatible hydrophobic light-activated adhesive (HLAA) that achieves a strong level of adhesion to wet tissue and is not compromised by preexposure to blood.
Pull-off adhesion testing (at 90°) was performed on an ADMET eXpert 7601 universal tester with fresh porcine epicardial tissue. The tissue was kept in phosphate-buffered saline to assure that it remained wet during testing. The pull-off procedure involved the controlled application of a preload (−1 N) to the adherent PGSU patch followed by grip separation at a rate of 8 mm/min, causing uniform patch detachment from the tissue surface. Adhesion force was recorded as the maximum force observed before adhesive failure, when a sharp decrease in the measured stress was observed.
In addition, in vitro burst pressure testing was performed on freshly explanted swine carotid arteries.
This work was supported by the Center for Integration of Medicine and Innovative Technology grant 11-315 and W81XWH-09-2-0001, the Technology Research Program grant of Boston Children’s Hospital, and NIH grant HL73647 to P.J.d.N. This work was also supported by the NIH grants GM086433 (to J.M.K.) and DE013023 (to R.L.). M.J.P. acknowledges the Portuguese Foundation for Science and Technology (fellowship SFR/BD/43013/2008) and the MIT-Portugal program (bioengineering focus area). N.L. acknowledges the German Research Foundation (DFG) for financial support (LA 2865/1-1).
Researchers at LANL used an ADMET eXpert 7601 frame to run ASTM testing on sPVC and APU ester specimens to compare the properties of commonly used sPVCs with APU and investigate the better selection for nuclear material storage.
For ASTM D412 testing, specimens of each bag were cut into dumbbell or dog-bone structures using Die D according to ASTM D412. Samples were mounted on GV-1T manual vise grips with serrated jaws and tested with the crosshead velocity of 3.84 mm/sec. The elongation and applied force were recorded automatically on MTESTQuattro software until the sample reached the break point. ultimate tensile strength, breaking strength and maximum elongation to verify that the materials meet the requirements established for bag-out bags and to predict how the material will perform in use under normal and extreme conditions.
ASTM D4833 tests were run on the same system using the puncture test fixture designed per ASTM D4883. A circle-cut sample of 50.8 mm diameter was prepared and locked in the fixture. The steel rod applies force against the center of the sample with the crosshead velocity of 5 mm/sec. The resistance force was recorded automatically until the sample reaches the rupture point.
This system has been configured to allow users to perform a wide variety of adhesive tests on a single easy to use and compact instrument.
eXpert 7601 D1894 Friction Testing System
This system has been configured for performing fiction testing. It includes everything you need to perform ASTM D1894 testing quickly and accurately.
eXpert 7601 XLT D412 Tension Testing System
This system has been configured for performing tension testing on rubber and elastomers. It includes everything you need to perform ASTM D412 testing quickly and accurately.
eXpert 7600 for Syringe Testing
The ADMET eXpert 7600 syringe testing system has been configured to allow users to specifically perform syringe testing with the option to add additional fixtures and features to expand the machine’s capabilities.