How to Measure Burst Strength
BURST STRENGTH/RESISTANCE is the capacity of a material to resist change when under pressure resulting in the burst of the material. It is used as a measure of resistance to rupture and largely depends on the tensile strength and extensibility of the material.
Burst strength or burst resistance is a property of packaging material used in shipment of merchandise and is commonly printed on the package. Packaging materials such as films or sheeted material (paper or plastic, for example) will burst when strained or put under pressure which compromises the protection of the packaged contents and therefore is important to all manufacturers to check the ability of the surrounding material to remain intact.
Bursting is also a featured negative characteristic of such products as balloons and condoms when the rubber material reaches its elastic limit during expansion.
Typical properties that can be obtained from a texture analyser graph:
Tensile Strength, Burst Strength, Distance to Burst, Resistance to Extension/Toughness, Extensibility, Stretch Quality, Elasticity, Tug Force, Tear Strength, Elongation
Typical Texture Analyser graph of stretched film showing burst strength point
Typical graph obtained from the extension of dough using a Dough Inflation System
Typical Probe/Fixture used for Measurement:
Tensile Grips and all fixtures that allow successful holding of a product in order to test in a tensile manner >>
Dough Inflation System >>
Film Support Rig >>
Sometimes the properties of a thin film are under investigation, but the film might be unsuitable for any other type of testing. An example would be a film of dried nail polish; depending on its properties, this can be too brittle to clamp in tensile grips, it is too thin to test under compression and it may not be large enough for bend testing.
In cases such as this, the Film Support Rig is ideal, as the sample is clamped at the edges and put under “biaxial tension” by a spherical probe pushing into the centre. In practice, this means that the whole film is stretched from the clamped edge towards the ball probe. The results are very repeatable providing the probe is centralised in the support aperture, and the film’s thickness is measured as accurately as possible. The same is true for the reasons for using a Tortilla Pastry Burst Rig.
Tortilla Pastry Burst Rig >>
The above are only typical examples of burst strength measurement. We can, of course, design and manufacture probes or fixtures that are bespoke to your sample and its specific measurement.
Once your measurement is performed, our expertise in its graphical interpretation is unparalleled – no-one understands texture analysis like we do. Not only can we develop the most suitable and accurate method for the testing of your sample, but we can prepare analysis procedures that obtain the desired parameters from your curve and drop them into a spreadsheet or report designed around your requirements.
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