[TheForge] food grade coating

[John Allen]

My company does 95% industrial food work and I just built a million dollar
bagging line for doing lettuce/carrots/etc. Anything and everything we have
must have the NSF logo on it to have food contact. Restaurants and food
service use some nasty chemicals to clean stuff and it can remove almost
everything.

The problem with coatings is that they are coatings. The only option you
have in changing color of metal and keeping it immune to peeling is to have
the metal anodized from a plating company. Even still, major acid/bases can
still do damage to the anodized, but it is the only thing out there. Also
if the stainless steel has been passivated, then the strong outer layer
won't really let anything bond to it.


On Tue, Jun 24, 2014 at 10:08 PM, Wayne Ackman <stryker at vulcanpro.com>
wrote:

> Mike, Peter, crcarlos:
>
> thank you
> all interesting options for us to explore.
>
>  Mike Spencer <mailto:mspencer at tallships.ca>
>> June 24, 2014 at 7:54 PM
>>
>> Brownell's Oxpho-Blue also contains selenium (which makes it a pain to
>> get in Canada because Brwonell won't ship it here due to hazard regs
>> in the US).
>>
>> I've fooled around with various blues, used Oxpho-Blue quite a lot.
>> Never found anything that was resistant to getting wet.
>>
>> Never tried the method using molten poatssium nitrate. I've heard
>> long ago of someone using it for fancy spurs.
>>
>> It may be too late to say this but Parkerizing or phosphating
>> (producing a black finish) might be more durable. Parkerizing involves
>> manganese, possibly on the toxic list but far less worrisome than
>> selenium.
>>
>>
>>
>> FWIW,
>> - Mike
>>
>> Peter Fels & Phoebe Palmer <mailto:artgawk at thegrid.net>
>> June 24, 2014 at 4:14 PM
>>
>> Outside my area of expertise Wayne,
>> but old time gun bluing was usually selenium based, a grade B poison , if
>> memory serves.
>>
>> On Jun 24, 2014, at 2:08 PM, Wayne Ackman wrote:
>>
>> I've been working on a restaurant. Made them some metal countertops that
>> they wanted to have blued.
>> We used PermaBlue, which turned out decent. I then sprayed a couple coats
>> of urethane on the counters.
>> The restaurant hasn't opened yet, but someone spilled something (soda
>> supplies?) on the counter and it
>> ate right thru the finish. This has opened the concern about what kind of
>> coating we can put on the counters
>> that would furnish a food grade finish. Has anyone done this? And have
>> any suggestions?
>> Thanks for any help.
>>
>> Wayne
>>
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>> Wayne Ackman <mailto:stryker at vulcanpro.com>
>> June 24, 2014 at 3:08 PM
>> I've been working on a restaurant.  Made them some metal countertops that
>> they wanted to have blued.
>> We used PermaBlue, which turned out decent.  I then sprayed a couple
>> coats of urethane on the counters.
>> The restaurant hasn't opened yet, but someone spilled something (soda
>> supplies?) on the counter and it
>> ate right thru the finish.  This has opened the concern about what kind
>> of coating we can put on the counters
>> that would furnish a food grade finish.  Has anyone done this?  And have
>> any suggestions?
>> Thanks for any help.
>>
>> Wayne
>>
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-- 
John Allen
Country Metals, LLC
(856) 542-4316 (cell)
(856) 504-0087 (fax)