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Term Video
Test summary
This standard is designed to measure the force to initiate tearing in plastic films generally having a thickness less than 0.25 mm. Specimens are cut to a closely defined shape, ideally using a die cutter. The specimen geometry has been chosen to produce a stress concentration in a small area of the specimen. The cut specimens are put under tension in a test stand set at a constant rate of movement while the resultant tensile force is recorded. The maximum force in newtons and amount of elongation in mm are reported
Test apparatus
Die cutter
Micrometer reading to 0.0025 mm
Force testing stand
Suitable range loadcell compatible with the force testing stand
Preparation
Where conditioning is required, test specimens are stored at 23 ± 2° C, 50 ± 5 % RH for 40 hours.
Test method
If required, pre-condition the samples at 23 ± 2° C, 50 ± 5 % RH for 40 hours.
At least five samples are required. They may be cut perpendicular to the machine direction, or transvers to the machine direction of the sample material.
Specimens are cut, ideally using a die cutter, which is kept in good condition to ensure the cut specimens do not deviate by more than 0.5 % from the dimensions specified.
The thickness of the specimen is accurately measured in several points in the notched area and an average value calculated.
Specimens are clamped between the fixed (usually lower) grip, and the moving (usually upper) grip of the force testing stand.
The test stand is set in motion at a fixed crosshead speed of 51 mm/min.
After complete rupture of the specimen the maximum tensile load is measured, together with the maximum extension.
Calculate the mean maximum load and extension for all valid specimens tested in each principle direction of orientation.
Report
The test report shall contain:
All the information necessary for the complete identification of the sample
The average thickness of each specimen, and the average thickness of all test specimens
The average value of tear resistance calculated in newtons, and the maximum extension in mm, plus standard deviations of these averaged values
![FPT-H1 Graves tear test ASTM D1004 using 100 mm vice grips, face view FPT-H1 Graves tear test ASTM D1004 using 100 mm vice grips, face view](https://s3.eu-west-2.amazonaws.com/assets.mecmesin.com/styles/case_study_gallery_540w/s3/2020-01/2077-432-625-D1004.jpg.webp?itok=_eXs4smw)
![FPT-H1 Graves tear test ASTM D1004 using 100 mm vice grips, side view FPT-H1 Graves tear test ASTM D1004 using 100 mm vice grips, side view](https://s3.eu-west-2.amazonaws.com/assets.mecmesin.com/styles/case_study_gallery_540w/s3/2020-01/2078-432-625-D1004.jpg.webp?itok=Donjar8s)
![Graves die dimensions, ISO 34-1, ASTM D624, D1004 Graves die dimensions, ISO 34-1, ASTM D624, D1004](https://s3.eu-west-2.amazonaws.com/assets.mecmesin.com/styles/case_study_gallery_540w/s3/2020-01/2132-Graves-die-dims.jpg.webp?itok=3fAUa13g)
![Mecmesin can provide online demonstrations of our testing systems and deliver training online Online demonstrations and training available from Mecmesin technical sales engineers](/themes/mecmesin/jpg/message-online_demos.jpg)
Online test equipment and training demos
As more people are working from home to reduce non-essential travel, our technical sales engineers can provide online equipment demos or training sessions via web-based video calls.
If possible, send in your own samples and our sales team will be able to present your own products being tested.
Get in touch to discuss your requirements and to arrange an online demo or training session.