A burst strength test measures a material’s ability to withstand internal pressure before it ruptures. It’s often used to evaluate the strength of packaging materials like corrugated cardboard or flexible packaging. The test involves applying pressure, typically through a hydraulic or pneumatic system, until the material bursts. The pressure at which the material fails is then recorded as its burst strength.
Sample Foil Laminate
Here, we get triplex-layer aluminum foil laminate well prepared. The foil structure is PET 12um/AL 7um/LDPE 45um, with an overall thickness of 65 microns.
- PET 12 µm, means polyethylene terephthalate membrane stretched in machine direction and transverse direction with thickness 12 microns (equals to 0.48 gauge). It is of great printability, mechanical stability to work as the print substrate in the flexible packaging industry.
- Al 7 µm, stands for food-grade aluminum foil sheet with thickness 7 microns, which is the most cost-effective foil applied in the flexible packaging industry. It is non-toxic, corrosion resistant, light-weight, durable and high barrier.
- LDPE 45 µm, stands for low-density polyethylene film produced by blown process with thickness 40 mirons. It can be modified to meet the stringent requirements of various products.
These 3 layers are combined together through dry lamination and solvent-free lamination craftsmanship in our manufacturing plant.
Test Equipment
Our laboratory is equiped with this pendulum bob tester supplied by GBPI, a reputable supplier of laboratory instrument in the flexible packaging field.
We perform burst impact test on a regular basis, not only on our foil laminates, but also on each substrate film we source.
Burst Strength Test Standards
We follow chinese national standard GB/T 8809-2015 to conduct the burst strength test in our laboratory. It outlines the testing methods for the impact resistance of plastic films using a pendulum falling weight method.
Burst Strength Test Values
The values of burst strength test on 4 sample foils are stipulated in the table below, which should be of help for you to understand its property.
| Foil Laminate (PET12/AL7/LDPE45μm) | Burst Strength (N) |
| #1 | 0.55 |
| #2 | 0.54 |
| #3 | 0.56 |
| #4 | 0.55 |
Burst Strength Test Video
We get this test process recorded by the video, and you are advised to have a further understanding on this burst strength test through this video.
Conclusion
Burst strength test helps us to get a true understanding on the intrinsic properties of each substrate film and laminate foil we produce. Upon our test, PET12/AL7/LDPE45μm foil should be good protection for products with capacity lower than 200~250ml. When the capacity increases, the overall thickness of the foil will have to be escalated. Sometimes, the film layer may have to be modified to suit the requirments of the inside products. With this burst test regularly performed in our manufacturing plant, we are able to decide the very best packaging materials for the products of our customers, at the favorable cost. You may contact our professional team for further assistance whenever you have any questions.