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Dyne test inks

Dyne Test Inks are special liquid mixtures that allow assessing the level of adherence of a liquid on a plastic surface. 

Used mainly in the Laboratory, they allow accurate measuring of the effects of corona treatment.

Mode of operation

Apply a thin layer of liquid, using the supplied brush, on a surface of 5/7 cm of the treated part of the sample. Measure the time taken by the liquid to divide into droplets.

If the layer of the surface liquid has not changed after two seconds, it means that the wettability of the sample is greater than the value of the fluid used.

To determine the exact value of wettability use a higher value solution:

  • if it stays stretched out for two seconds, the wettability of the film corresponds to the value indicated by the liquid used for testing
  • if the liquid is divided into droplets in less than two seconds, you should use a of lower value solution.

Ferrarini & Benelli certifies that the dyne/cm values are exactly corresponding to the mixture of Formamide and Cellosolve made according to ASTM D procedures 2578-84. This certification is supported by sample checks carried out using a higher-class device known as "contact angle meter".

Directions for use

Always keep the bottle closed because the cellosolve tends to evaporate thus changing the composition of the mixture.

The date of expiry of the liquids is not easily quantifiable, because it depends on how much you leave it open to air. To guarantee a perfect measurement it is advisable to replace Test Inks every six months.

Values of reference (dyne / cm)

For the inks the available values are 30 - 58 dynes / cm
 

COMPARATIVE TABLE

INK

PEN

CORONA MARKER

Operation

 

A series of liquid mixtures (whose values of wettability are known) are used; the mixture that is at the threshold of drop formation and indicates the wettability value of the solid is looked for.

 

You draw with the pen a line of about 5 cm.

You draw with the marker a line and the ink remains permanently spread on the treated area.

Type of test

Measure the tension giving precise values of treatment

Quick test: measure if the liquid remains spread for at least 2 seconds

Quick test: treated / non-treated (the ink quickly dry and remains permanently spread on the treated zones)

User

Quality Laboratory

Production operator

Production operator

Composition

Mixture of Formamide and Cellosolve, "Du Pont Victoria Pure Bleu 80" dye (ASTM D procedure 2578-84)

Mixed solvent containing the following functional groups: alcohol, glycol ether, carboxylate, amide and different amounts of water.

Mixture with ethanol

Warnings for use

Components attack the skin, so you must avoid any direct contact and you must protect the eyes.

Non Toxic

Components can cause eyes irritation, so you must avoid any direct contact and wear personal protection equipment. Flammable liquid.

Packaging

8 small bottles, ml.

In packs of 10 + 1 free

In packs of 10 + 1 free
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