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topic 60442

Where to buy Hull Cell "Stress Tabs"


April 19, 2017

Q. I am looking to purchase Hull Cell Stress Tabs. These were previously purchased through Larry King (Rosedale, NY) but they are out of business. Does anyone have other contacts to purchase these Hull Cell Stress Tabs through?

H McCarthy
- Massachusetts, USA


April 24, 2017

A. Hi H McCarthy,

There's hull cell stress tabs mentioned in Relli Technology webpage. You may check it out.

http://catalog.ilsmart.com/7407/js_24_1440_900/results.asp?s.Description=hull+cell+stresstab

Regards,
David

David Shiu
David Shiu
- Singapore



How do "Stress Tabs" work?

June 8, 2018

Q. I am doing some testing with a Hull Cell and would like to see if the stress tabs on the Hull Cell panels will work. Can someone explain more details about how this works?

David Kraeuter
Sunnen Products Company - SAINT LOUIS, Missouri


June 2018

A. Hi David. Stress tabs are thin Hull Cell panels which are serrated like a hair comb, and coated with maskant on one side so they only get plated on one side. The principle is that tensile stress in the plating on that side will cause the teeth to curl in, and compressive stress will cause the teeth to curl out, so that you can (perhaps among other things) determine at what current density you have the least stress. Good luck.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"


June 8, 2018

Q. How large are the combs? Is there an effect of having created extra edges that will influence the results of the Hull Cell test? Will the curling in or out of the teeth influence the current density it is experiencing?

David Kraeuter [returning]
Sunnen Products Company - St. Louis


60442
June 2018

A. Hi. The only one I've personally seen from was Larry King (as mentioned above). An old ad said they had 5 tabs, but I've seen articles where people have fabricated thin metal films on silicon for somewhat similar investigations. I do not know if Relli is selling off old inventory from Larry King or there is another manufacturer.

I hear the test being called qualitative rather than quantitative, so the effects of plating on the edges of the foil, or the increased or decreased current as the tabs bend closer to or further from the another are probably not carefully documented things.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"



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