What is a Dyne Pen?

When the Dyne level test pen is applied to the surface, the liquid will either form a continuous film on the surface or pull back into small droplets.
If the Dyne test fluid remains as a film for 3 seconds, the substrate will have a minimum surface energy of that ink value, expressed in mN/m (Dynes).

Dyne Pens from Dyne Testing

The Dyne Testing Ltd supplied test pen is based on a valve tip applicator.

The principle is simple: keep the testing part of the pen away from the fluid storage part of the pen (in other words, no wicking from the substrate).

The diagram (right) demonstrates how that is accomplished; by pressing the tip firmly down, the valve is opened and fresh fluid floods the tip; this flushes it clean, and allows the tester to lightly pass over the sample to accurately determine Dyne level. Results are based on how long the test solution takes to form beads on the sample surface.  

Dyne Test Pens are available in a range of values from 30 to 70 Dynes/cm (mN/m) and are supplied in disposable pens.  The test fluid contained within the pens is to ISO 8296 with additional high visibility dye for easy readings.

Dyne Pen Testing

Our Valve Tip Dyne Pens at a glance:


  • Valve tip ensures low risk of contamination of test fluid.               

  • No leakage of chemicals from pens.

  • Expiry date stamped on pen body.

  • Greater “mileage” per pen.

  • Lower cost per test.

  • Can be used on a wide variety of materials.

  • High visibility violet test fluid.

  • Small tip ensures very low evaporation.


  • Unsuitable for use on some grades of PVC

Dyne Test Pen

Other Pens Available:

QuickTest pen (go/no-go tester)          


  • Leaves a permanent mark on surface.

  • No leakage of chemicals from pens. 

  • High visibility red test fluid. 


  • Leaves a permanent mark on surface

  • Can only be used on a limited variety of materials.

  • Only available as 38-40mN/m

  • Accuracy undocumented.

  •  Tip subject to contamination.

“Jumbo Magic Marker” style pens



  • High cost per test.

  • Low “mileage” per pen.

  • Leaks of test fluids are common.

  • Felt tip soaks up contamination and requires frequent changing.

  • Evaporation of test fluid from felt tip leads to inaccurate results.

  • Typically non-compliant with ISO8296 test as fluid dispensed tend to be much greater than 12 microns thick.

Speak to the experts...

Do you want to find out more about Dyne Test pens? You can contact our experts by calling us on +44(0) 1543 411 460 or emailing us at info@dynetesting.com.

The information supplied throughout this site is designed only as guidance for the safe use, storage and handling of the product. This information is correct to the best of our knowledge and belief at the date of publication however no guarantee is made to its accuracy. This information relates only to the specific material designated and may not be valid for such material used in combination with any other materials or in any other process.