zahn cup reading for fountain solution

[amomtaz93]

Hi everybody:

Could any one tell me what is the ideal zahn cup reading for fountain solution in case it is the right way to measure the fountain viscosity..........

Thanks.

[rapid3]

Fountain solution?????? You mean aqueous coating, right?

[RGPW17100]

Zahn as mentioned is for aqueous. Cant ever see a reason to measure viscosity of water. You measure conductance and PH for fountain solution

[amomtaz93]

Thanks for your reply friends but 2 days ago i read that we can measure the viscosity of fountain solution using zahn cup...!! So i am asking....in case any body sure it is not right....Just tell me

[Jimbo]

Did the article you read mention a paper stretcher?

[amomtaz93]

No but what is the relationship..??

[DrummondAW]

Did the article you read mention a paper stretcher?

Haha. I remember at my old job we actually sent someone to a different company to pick one up.

[amomtaz93]

Haha. I remember at my old job we actually sent someone to a different company to pick one up.

BE serious....?????

[RGPW17100]

The serious answer is you do not read fountain solution with a zahn cup. If you take water and add fountain solution to it the water bead is still the same thickness as just water without fountain. You measure fountain solution with a conductance meter and with a ph tester.

[Lithogreen]

http://www.pneac.org/sheets/litho/al...eeprinting.pdf
The second page they measure the effect IPA has on the viscosity of fountain solution -
Note they say Alc subs have very little effect on the viscosity.
pH and conductivity will do.

Surface tension dynes/cm # would be more effective then measuring viscosity