Hi everyone,
I work with Testronix Instruments, and I’m sharing some practical notes on burst strength testers because the same questions keep coming up in packaging and paper QC discussions. I’d also like to hear how others are testing.
What is a burst strength tester?
A burst strength tester measures the pressure a material can withstand before it ruptures. A sample is clamped over a rubber diaphragm, and hydraulic or fluid pressure is applied until the sample bursts. The peak pressure is recorded as the burst strength. Digital models display and store the result, which reduces operator error compared to analog gauges.
Which materials are tested?
Corrugated boxes and paperboard
Kraft paper and liner board
Fabrics, nonwovens, and textiles
Plastic films and some packaging laminates
What to check before choosing a burst strength tester
Pressure range: Match it to your weakest and strongest materials, for example light paper vs. heavy board.
Standards compliance: Confirm it follows the test methods you use (such as ISO 2758, ISO 2759, or ASTM D774, depending on your material).
Digital display and resolution: Check how clearly the peak value is held and shown.
Clamping system: Consistent clamp pressure directly affects repeatable results.
Diaphragm quality: Ask how often it needs replacing and how easy it is to change.
Calibration: Confirm calibration certificates and how recalibration is done.
Data output: Some units offer memory, printing, or PC connection for reports.
Common mistakes
Testing samples that have not been conditioned (humidity and temperature change paper results significantly)
Uneven clamping or wrinkled samples
Using a worn diaphragm
Comparing results from machines with different standards or pressure ranges
Disclosure: I’m associated with Testronix Instruments, which makes testing equipment, including a digital burst strength tester (https://www.testronixinstruments.com/bursting-strength-tester-digital/). I’m happy to answer general testing questions here, whether or not they relate to our products.
Question for the community: What materials are you testing for burst strength, and have you run into repeatability or calibration problems?