[labnetwork] Corrosive exhaust material of construction

[Bill Flounders]

At UC Berkeley we selected an
epoxy coated galvanized.
Product name of approved epoxy based coatings
I am familiar with are 'Plasite" and "tnemec".
I am not familiar with a PVC coated galvanized

General summary from my experience:
3 commonly approved choices:
a. teflon coated stainless - expensive, no field retrofit
b. FRP like at Purdue - more expensive, convenient field retrofit
c. epoxy coated galvanized - least expensive, convenient field retrofit
(the quality of the coating defines lifetime and performance.
Some people have had bad coatings and hence bad experience.
I had triple coat and wet sponge low voltage (Holiday detector)
  test verification of each piece. The previous Berkeley Microlab
also used epoxy coated galvanized and had 28 corrosion free years.

Bill Flounders
UC Berkeley

Morrison, Richard H., Jr. wrote:
> Hi Iulian,
>
> On the new facility we just built we used PVC coated galvanized steel duct work. This was approved by our insurance carrier.
>
> Rick
>
>
> -----Original Message-----
> From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Iulian Codreanu
> Sent: Thursday, December 19, 2013 1:52 PM
> To: Fab Network
> Subject: [labnetwork] Corrosive exhaust material of construction
>
> Dear Lab Network,
>
> I, once again, seek your wisdom.  Could you please share with me the type of material used for your corrosive exhaust system, how long you had it in operation, if you had any problems with it, and what you would do differently of you were in a position to do so?
>
> Thank you very much for your help.
>
> Iulian
>
> --
> iulian Codreanu, Ph.D.
> Director of Operations, UD NanoFab
> University of Delaware
> 149 Evans Hall
> Newark, DE 19716
> 302-831-2784
>
>
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