A 95 kPa specimen bag earns its label by holding a 95 kPa pressure differential without leaking, and the test behind that claim is a pressure-hold check on the sealed bag, backed by the 1.2 metre drop in UN packing instruction P650. The 95 kPa figure is not a burst strength invented by a supplier; it is the pressure differential that secondary packaging for Category B infectious substances must survive. When a Canadian lab receives a shipment, the practical checks are seal integrity, the lot test report and a sample drop test.
What does the 95 kPa figure actually mean?
It is a pressure differential, roughly 0.95 bar, applied across the packaging rather than a volume or a weight. The requirement sits on the secondary packaging — the leak-proof bag that holds the primary receptacle and the absorbent material — and it exists because aircraft cargo holds and road transport expose packages to pressure changes.
Passing it means the seal and the film hold the differential for the set test period with no leakage. Failing it usually shows up at the seam or at the closure, not in the middle of the panel.
Where does the 95 kPa requirement come from?
The figure comes from the UN Model Regulations, where packing instruction P650 sets out how Category B biological substances (UN3373) must be packed. In Canada those rules reach shippers through the Transportation of Dangerous Goods Regulations, so a diagnostic laboratory sending specimens is working to the same pressure and drop conditions as any other UN3373 consignment.
P650 pairs the pressure differential with a drop test, and both belong together. A bag that holds pressure but splits on impact, or survives a drop but weeps at the seam, does not meet the instruction.
How is a specimen bag tested for leaks?
| Test | How it is run | What it confirms |
|---|---|---|
| Pressure-hold (pressure decay) | Sealed sample held at a 95 kPa differential for a set period | Seal and film hold the rated differential |
| Water-bath bubble test | Pressurised sample submerged in water | A visible leak at seam or closure |
| Dye penetration | Coloured solution held against the seal | Seam channels and weak heat seals |
| Drop test | 1.2 m drop in specified orientations | Survives handling in transport |
| Visual seal inspection | Held against a light, checking folds and gaps | Obvious sealing faults before use |
What should a Canadian lab check on delivery?
Ask for the lot test report or certificate of conformity and file it against the shipment. Then run a quick incoming check on a sample: look at the seals, confirm the absorbent pad and the documentation pocket are present, and confirm the bag is not creased across a seal line. Storage matters too — keep the bags flat and out of direct sun so the film does not take a set.
None of this replaces the supplier's testing. It is a check that the box in front of you is the product that was tested, and that nothing happened to it between the factory and your bench.
Ordering for a clinic, lab or care home? Wholesale and multi-site ordering covers case pricing and account setup, and the B2B wholesale collection lists the lines stocked for institutional buyers.
Related reading
diagnostic laboratory supplies hub; case review: a Canadian lab's spore test investigation; laboratory centrifuges in Canada and the US; 6 x 9 inch 95 kPa specimen bags, 100-pack.
Frequently Asked Questions
What does 95 kPa mean on a specimen bag?
It is the pressure differential the secondary packaging must withstand without leaking, as set out in UN packing instruction P650.
Is 95 kPa a Canadian requirement?
It comes from the UN Model Regulations and reaches Canadian shippers through the Transportation of Dangerous Goods Regulations, where Category B specimens travel as UN3373.
How is a specimen bag leak tested?
Suppliers use a pressure-hold test on the sealed bag, often with a water-bath bubble check and a dye test on the seal, plus the P650 drop.
Do specimen bags need to pass a drop test too?
Yes. P650 pairs the 95 kPa pressure differential with a 1.2 metre drop in specified orientations.
What should a lab keep on file?
Keep the lot test report or certificate of conformity plus any internal sample check notes, so a shipment can be traced if a bag fails.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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