The key criterion for choosing cut-resistant gloves should be the level of protection against cuts – and this is best verified by the TDM test in accordance with the ISO 13997 standard. What does it actually mean? And why is it worth paying attention to when buying?
In this article, we explain how the TDM test works, how it differs from the classic EN 388:2003 test and why its results are particularly important in industries with a high risk of injuries.
What is a TDM test?
TDM (Tomodynamometer) is a test of the resistance of a glove material to a blade cut, which is described in the ISO 13997 standard and is currently a supplementary standard to the classic EN 388:2016+A1:2018 standard.
How does TDM test (ISO 13997) work?
The TDM test measures how much force (in Newtons) is needed to cut through the glove material with a sharp, straight blade in one movement. The force measured is between 2-30 N. The test is performed using a TDM machine that generates a controlled cutting motion at different pressure levels.
The higher the force needed to cut through the material, the better the protection.
Resistance levels according to ISO 13997 (TDM test)
| Level | Minimum cutting force | Marking on the glove |
|---|---|---|
| A | ≥ 2 N | Low resistance |
| B | ≥ 5 N | Light protection |
| C | ≥ 10 N | Medium resistance |
| D | ≥ 15 N | Increased protection |
| E | ≥ 22 N | High resistance |
| F | ≥ 30 N | The highest protection |
Note: Level F means that the material requires at least 30 Newtons of pressure to cut through it – a very high level of protection.
How does TDM differ from the “classic” intersection test?
| Characteristic | EN 388 Test (Couptest) | ISO 13997 (TDM) Test |
|---|---|---|
| Cutting tool | Round blade | Straight blade (like a knife) |
| Type of movement | Multiple movements | One cutting motion |
| Result | Factor (e.g. 3.2) | Force in newtons (e.g. 15 N) |
| Effectiveness for hard fibers | It may be overpriced | More accurate and realistic |
| Obligatory? | NO, but recommended | YES, if Couptest fails or fabric damages the blade |
Conclusion: The TDM test better reflects the actual risk of being cut by a sharp instrument – one that a worker encounters every day (sheet metal, glass, knife, blade).
In which industries is TDM testing most important?
- Metal industry and sheet metal processing
- Recycling and waste segregation
- Logistics and storage of sharp objects
- Glass industry and plastic processing
- Automotive and assembly of elements with sharp edges
How do you know if a glove has passed the TDM test?
On the label compliant with EN 388:2016+A1:2018 you will find the letters A–F (e.g. 4X43D), where:
- “D” is the result of the ISO 13997 (TDM) test
- If the Couptest result was not reliable, an “X” will appear in its place
Rule: The higher the letter (from A to F), the better the protection against sharp cuts.
Summary – why is it worth knowing the TDM test?
- This is the most reliable test of resistance to blade cuts
- Better than the classic Couptest for hard fibers (e.g. HPPE, fiberglass)
- Allows you to consciously select gloves for real threats
- Supports employee safety in high-risk industries