Standard 25 mm
Pneumatic Vice Action Grip
Holding the barrel square without crushing it — a thin-wall polypropylene barrel deforms under a hard jaw and the added friction is recorded as plunger force.
SpecificationsTesting standard
ISO 7886-1 Sterile Single-Use Syringe Testing
Sterile hypodermic syringes for single use — Part 1: Syringes for manual use
Written and technically reviewed by Dak System Inc. engineeringLast reviewed
ISO 7886-1 sets the requirements and test methods for single-use manual hypodermic syringes. The most-run procedure measures the force to operate the plunger in an axial compression test at a constant 100 mm/min, reading the breakaway force, the maximum glide force and the average glide force from a single trace, alongside checks on plunger-stopper separation, leakage under pressure and nozzle fit. The current edition is ISO 7886-1:2017.
At a glance
- Test type
- Load–deflection & proof load
- Published by
- ISO
- Edition
- ISO 7886-1:2017
- Runs on
- Series 7200 and Series 9000
From the test method to your testing system
Explore the DAK machines already listed for ISO 7886-1, then review the grips, measurement and setup requirements below.
Universal Testing MachineSeries 7200Explore the machine →
Universal Testing MachineSeries 9000Explore the machine →Jump to a specific section
01Understand the method
What the test does
Part 1 carries a set of mechanical tests on a finished syringe rather than one method. The plunger is driven along the barrel at a constant 100 mm/min while force is recorded, so the effort a clinician applies is measured directly. Annex E sets the arrangement out: the syringe is filled with water and connected through 500 mm ± 5 mm of 2,7 mm ± 0,1 mm bore tubing to a 1,2 mm (18 G) needle about 40 mm long, then compressed axially while breakaway force, maximum glide force and average glide force are read from one trace. Separate procedures check that the plunger stopper does not separate under a specified force, that barrel and nozzle hold pressure, and that the nozzle fits a conical fitting.
What it measures, and why it matters
The headline figure is the force to operate the plunger — breaking free from rest, then moving steadily. A syringe that is stiff, or that judders, makes accurate dosing difficult and small-volume delivery unreliable. Plunger-stopper separation force guards against the stopper pulling off inside the barrel during aspiration, and the leakage tests against dose loss and contamination. None is a material property: they are product performance requirements.
The forces are small enough to dismiss and consequential enough that the standard fixes them. A plunger needing a high force to break free delivers its first increment as a jerk rather than a flow — for a small dose, the difference between the intended amount and a visible overshoot. Glide force matters differently: it is what a clinician feels over a long injection, and an uneven one is the usual complaint behind a syringe rejected on the ward rather than in the laboratory.
02Prepare the specimen and test settings
The syringe as supplied
- Specimen
- Finished sterile syringes within shelf lifeLubricant migrates and the stopper takes a compression set over time, so both move the operating force.
- Mounting
- Barrel held square, plunger driven along the axisAny side load adds friction that belongs to the fixture rather than the product.
- Both directions
- Push and withdrawAspiration force matters as much as delivery force — a stiff withdrawal makes drawing up a dose unreliable.
- Temperature
- As the specification statesLubricant viscosity is temperature-dependent, so the running force is too.
Test speed
- Speed
- 100 mm/min, constantAnnex E. An axial compression run on a water-filled syringe connected through 500 mm ± 5 mm of 2,7 mm ± 0,1 mm bore tubing to a 1,2 mm (18 G) needle of about 40 mm length. Annex E is informative, so a governing specification may name a different rate; where it is silent, this is the figure to set.
- Three quantities on one trace
- Breakaway force, maximum glide force, average glide forceReporting one figure without saying which it is makes the number ambiguous. They are not interchangeable.
- Stroke time
- About 36 s for a 60 mm stroke at 100 mm/minDakArithmetic, but it is what sizes the run and shows how brief the breakaway peak is against it.
- Data capture
- A few hundred readings per secondDakThe breakaway peak lasts a fraction of a second at 100 mm/min, and heavy smoothing rounds it off.
03Build the test setup on a DAK machine
What the machine must be capable of
Forces are small — often a few newtons — so a low-capacity load cell with clean resolution matters far more than frame capacity, and the trace must resolve the breakaway peak as well as the steadier glide force. Alignment is the real requirement: the plunger has to run along the barrel axis, so a fixture holding the barrel square while the plunger travels freely is what makes results repeatable.
The frame must also hold 100 mm/min smoothly over a long travel, because stick-slip in the crosshead drive is recorded as if it were the syringe. At that rate a 60 mm stroke takes about 36 s, and the breakaway peak occupies a fraction of a second of it — so data capture wants a few hundred readings per second, not a few. As the test runs on a sterile product taken from its pack, the fixture must hold the barrel without marking it: the same specimens may be needed for the leakage checks afterwards.
Grips and fixtures for this method
ISO 7886-1TJ-201
Syringe-Push Test Fixture
A fixture built for syringe work, holding the body while the plunger is driven along the barrel axis.
SpecificationsRunning ISO 7886-1 on the Series 7200 and Series 9000
Dak verifies against whichever standard the method names, and where a class applies our frames sit a class tighter than it asks.
| The method asks for | Dak supplies | |
|---|---|---|
| Capacity | Very low — often a few newtons. A low-capacity cell with clean resolution is what the method needs. | Load cells from 1 kg to 60 ton on the Series 7200, and 0.5 to 100 kN on the Series 9000 |
| Force accuracy | ISO 7500-1 Class 1 | ISO 7500-1 Class 0.5 — a class tighter than the method asks |
| Gripping | A holder gripping the barrel square so the plunger travels along the barrel axis with no side load. | Wedge, vice-action, pneumatic and hydraulic grips, built to the specimen |
| Environment | As the specification states. Lubricant viscosity is temperature-dependent. | 3009 series chambers, −150 °C to +400 °C — temperature only |
04Run the test
How the plunger force test runs
- Take syringes from unopened packs, within shelf life, and record the batch.
- Bring them to the specified test temperature.
- Mount the barrel square so the plunger travels along its axis with no side load.
- Set a low-capacity load cell and a data rate fast enough to resolve the break-free peak.
- Drive the plunger at the constant specified rate through the required travel.
- Record the break-free peak and the running force separately.
- Repeat for the withdrawal direction where required.
- Run the plunger-stopper separation, leakage and nozzle-fit procedures as the specification requires.
Watch the test
05Calculate, report and interpret
What comes out
Break-free force—
Peak force to start the plunger moving from rest, N
Usually the higher of the two. A high break-free force is what makes small-volume dosing jerky.
Running force—
Average force over the steady portion of travel, N
What the report has to contain
- Reference to ISO 7886-1
- Syringe identification, nominal capacity, batch and date of manufacture
- Test temperature
- Rate of plunger travel
- BREAK-FREE force and RUNNING force, distinguished
- Direction tested — delivery, aspiration or both
- Plunger-stopper separation force where run
- Leakage and nozzle-fit results where run
- Number of syringes tested
What goes wrong in practice
Side load from a misaligned fixture is the commonest error, and it inflates every force — usually a fixture gripping the barrel flange rather than the barrel, letting the body tilt as the plunger advances. Temperature is next: silicone lubricant thins as it warms, so a warm laboratory reports lower forces than the specification intends, consistently and invisibly. Cycling a syringe once before the recorded run lowers the breakaway force, which is why the measurement is taken on the first movement. And reporting one figure without saying whether it is the breakaway peak, the maximum glide force or the average glide force makes the number ambiguous — Annex E produces all three from a single run at 100 mm/min, and they are not interchangeable.
06Compare methods and find answers
What each requirement protects against
| Plunger force | Stopper separation | Leakage | |
|---|---|---|---|
| Protects against | Inaccurate dosing, clinician difficulty | The stopper coming off inside the barrel | Dose loss and contamination |
| Measured as | A force | A force | Pass or fail under pressure |
| Changes with age | Yes — lubricant and set | Yes | Less so |
None of these is a material property. They are product performance requirements on a finished device, which is why the specimen is the syringe as it leaves the pack rather than a coupon of its polymer.
Questions we are asked about this test
What is ISO 7886-1?
It is the international standard for sterile single-use hypodermic syringes for manual use. It sets requirements and test methods covering the force to operate the plunger, plunger-stopper separation, leakage under pressure and nozzle fit — all measured on the finished syringe rather than on its materials.
Why is plunger force measured in both directions?
Because aspiration matters as much as delivery. A syringe that is stiff to draw up makes it difficult to take an accurate dose from a vial, and a plunger that judders on withdrawal can pull air in. The two directions do not necessarily give the same force.
Why does the syringe have to be tested from an unopened pack?
Because handling and time both change the result. Silicone lubricant migrates within the barrel and the rubber stopper takes a compression set against the barrel wall, so a syringe cycled once already will not read the same. Testing from the pack keeps the measurement representative of what a clinician receives.
Why does alignment matter so much?
Because any side load between plunger and barrel adds friction that belongs to the fixture rather than the syringe. The forces here are only a few newtons, so a small misalignment can be a large proportion of the reading — and it inflates every result in the same direction.
Is this a materials test?
No. Every requirement is a product performance requirement on the finished device. The polymer grade, the lubricant and the stopper compound all matter, but only through how the assembled syringe behaves — which is why the specimen is the syringe as supplied.
What plunger force is acceptable?
The limit comes from the standard and scales with syringe size — a larger barrel has more sealing surface and legitimately needs more force. What matters as much as the number is which force it is: Annex E's run at 100 mm/min yields a breakaway force, a maximum glide force and an average glide force, and a figure quoted without saying which cannot be checked. Smoothness matters too — a syringe within its limit that judders through the stroke is harder to dose accurately than one slightly higher and steady.
Does the test apply to prefilled syringes?
Not this part. ISO 7886-1 covers syringes for manual use supplied empty. A prefilled glass syringe is a different construction with a different set of mechanical requirements, covered by the ISO 11040 series, and the plunger force behaves differently because the barrel material and the siliconisation are different.
Related
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Industries that test to it
Other standards explained
Planning ISO 7886-1 testing?
Discuss your specimen, test requirements and reporting needs with DAK engineering.
This page describes the method as practised. The governing text is the current edition from the issuing body. Tell us what you are testing and we will answer with the machine, the fixture and a quotation.