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JBaymore

Member Since 06 Apr 2010
Offline Last Active Today, 08:09 PM
*****

Posts I've Made

In Topic: Does Fading Always Mean A Glaze Isn't Food Safe?

Today, 10:33 AM

Hesselberth and Roy used leaching for drinking water as their guide. 

 

 

I think it is important to point out here that Mononna Rossol (ACTS NYC) was using the drinking water standards for comparisons to glaze leaching as a guideline before that book was ever published.  That is a GREAT book and Ron and I have presented together on glazes at NCECA in the past........ not slighting their work........ but giving credit where credit is due.

 

best,

 

.......................john


In Topic: Does Fading Always Mean A Glaze Isn't Food Safe?

Today, 10:26 AM

ok im going to take this a different direction

 

if glaze has nothing dangerous in it  and it leaches.   does it still cause any harm

 

if a tree falls in the forrest ..........

 

look if all the ingredients are non poisonous  and it leaches....    to me thats a safe pot.

 

Not in a different direction... I already made that point :

 

 

If the glaze is changing like you mention ... it is deteriorating and losing SOMETHING.  What that material is, is the question.  At one level it is possibly simply what you might call "poor product longevity" and is mainly a "repeat customer" issue.  At another level it might be a health concern for the user if the materials get into foodstuff and are ALSO toxic (see link below).

 

"Food Safe" is a term that has absolutely NO legal meaning as a term.  In the USA, for example, ASTM does not have a test for "Food Safe" for general consumer food serving goods.  The US FDA only regulates (and specifies procedures for using) lead and cadmium in any ceramic wares.

 

At the last NCECA it was stated by William Carty (you cannot get a better technical source than this guy!) that all matt glazes are not suitable for food use and that food use glazes should be fired above Orton Cone 1.  I was there... heard it first hand. 

 

http://www.slideshar...ynceca2014final

 

best,

 

...........................john


In Topic: Does Fading Always Mean A Glaze Isn't Food Safe?

Yesterday, 04:17 PM

If the glaze is changing like you mention ... it is deteriorating and losing SOMETHING.  What that material is, is the question.  At one level it is possibly simply what you might call "poor product longevity" and is mainly a "repeat customer" issue.  At another level it might be a health concern for the user if the materials get into foodstuff and are ALSO toxic (see link below).

 

"Food Safe" is a term that has absolutely NO legal meaning as a term.  In the USA, for example, ASTM does not have a test for "Food Safe" for general consumer food serving goods.  The US FDA only regulates (and specifies procedures for using) lead and cadmium in any ceramic wares.

 

At the last NCECA it was stated by William Carty (you cannot get a better technical source than this guy!) that all matt glazes are not suitable for food use and that food use glazes should be fired above Orton Cone 1.  I was there... heard it first hand. 

 

http://www.slideshar...ynceca2014final

 

best,

 

...........................john


In Topic: Hot Wax For Bottoms Of Pots?

Yesterday, 10:15 AM

FYI:  From a Beeswax MSDS:

 

"Respiratory: No respiratory protection is required

when working with the solid material. If airborne

concentrations of wax fumes, generated from molten wax,

are expected, a NIOSH/MSHA approved air purifying

respirator with a dust/mist/fume filter may be used.

Protection provided by air purifying respirators is limited

(see manufacturer's respirator selection guide). Use a

positive-pressure-air-supplied respirator if there is potential

for an uncontrolled release, exposure levels are not known,

or any other circumstances where air- purifying respirators

may not provide adequate protection. A

respiratory-protection program that meets OSHA's 29 CFR

1910.34 and ANSI Z88.2 requirements must be followed

whenever workplace conditions warrant a respirator's use."

 

"Toxicological Information:  No definitive information available on carcinogenicity,

mutagenicity, target organs or developmental toxicity."

 

"Hazardous Decomposition Products: Combustion

can yield major amounts of oxides of carbon and minor

amounts of oxides of sulfur and nitrogen."

 

"Cancer: No data available"

 

"Target Organs: No data available"

 

"Developmental: No data available"

 

 

best,

 

..............................john

 

 


In Topic: Kiln Dismantle ?

29 January 2015 - 11:08 AM

Here (mixing "chamber") back part of burner
http://community.cer...age/4907-image/

 

Landfill.

 

best,

 

.................john