Hello All,
OK, lets assume that I have checked my ceramic mug (I did) and it was
made in China (it was). If, for argument's sake, it had an improperly
formulated glaze that contained high levels of lead, how long does it
take for the lead to leach out? I have had the mug for a couple of
years now and use it daily. Am I currently exposing myself to high
levels of lead? Or, has it all previously leached out of the mug (and
me)?
Jay Soderberg
-----Original Message-----
From: Leo Higgins [mailto:[log in to unmask]]
Sent: Thursday, January 22, 2004 10:41 AM
To: [log in to unmask]
Subject: Re: [LF] COMPLIANCE QUESTION
Extraction of Pb from ceramic glazes that are not properly formulated
can be very high. So glazed products from unsophisticated potters and
small low tech manufacturers can be hazardous. Properly formulated
pottery glazes contains a lot of other cations besides Pb2+. Using a
good mix of alkaline earth cations and the typically requisite alkali
ions results in a tremendous reduction in the leachability of Pb from
ceramic glazes resulting in safe beverage cups. The problem is, how do
you know if the glaze is properly formulated? If the product comes from
large porcelain suppliers, you should have no concerns.
Leo
------------------------------------
Leo M. Higgins III, Ph.D.
ASAT Inc.
Central Region Mgr. / Director of Sales
[log in to unmask]
3755 Capital of Texas Hwy-So
Suite 100
Austin, TX USA 78726
tel: 512-383-4593
fax: 512-383-1590
mobile: 512-423-2002
------------------------------------
-----Original Message-----
From: Ofer Cohen [mailto:[log in to unmask]]
Sent: Thursday, January 22, 2004 9:07 AM
To: [log in to unmask]
Subject: Re: COMPLIANCE QUESTION
Joe,
What does the task force write about ceramic mugs?
Regards
Ofer Cohen
Manager
Quality Assurance, Reliability and Production Technologies Seabridge
Ltd. - A Siemens Company
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of Joe Fjelstad
Sent: Thursday, January 22, 2004 17:00
To: [log in to unmask]
Subject: Re: [LF] COMPLIANCE QUESTION
Hi Brian,
This from THE NEW JERSEY INTERAGENCY TASK FORCE ON THE PREVENTION OF
LEAD POISONING
"Leaded crystal can be used safely by adults sparingly. Food and alcohol
should not be stored in them. Liquids served in crystal glasses should
be drunk in a short period of time. Children and infants should not be
allowed to consume foods or beverages from leaded crystal."
We have a few centuries of experience with crystal and it tends to be a
special occasion item today but in the past, because it was so robust
compared to other glasses, it was likely in daily use. I have been able
to find cautionary statements, such as the above, which seem prudent
with current knowledge, but no case studies with data. I have drunk
water and wine (and even mimosa!) from lead crystal and still do on
special occasions without effect and assume by your ownership of crystal
that you have as well (at some point in the past at least). I must also
assume that you are not overly concerned about the stemware in your home
otherwise you would have sold or discarded it in some safe manor some
time ago.
Very best,
Joe
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