[Clayart] Porcelain question

MGordon clayart at earthlink.net
Sun Jul 3 11:03:15 EDT 2016


Ken, Try this...... carve with the door open & a fan at your back that  
blows all the dust out the open door. When done take  hose & wash the  
driveway down. Mike Gordon
On Jul 2, 2016, at 3:53 PM, Ken Chase via Clayart wrote:

> Well Jeff, you really got me thinking.
> Is there a safe way to carve and sand bone dry
> Porcelain? Outdoors maybe?
> The mask I wear is Hepa approved but if what
> You say is correct long after the mask comes
> Off I still risk breathing in silica.
> If you know of some safeguards I'd appreciate
> Hearing about them.
> Thanks much.
> Ken
>
> Sent from my iPad
>
>> On Jul 2, 2016, at 11:38 AM, Jeff Lawrence via Clayart  
>> <clayart at lists.clayartworld.com> wrote:
>>
>> Ken Chase wrote:
>>
>>>
>>> Thanks Jeff:
>>> I work alone. I carve bone dry porcelain in my
>>> Garage. I do wear a mask. I don't believe I'm putting anyone at risk.
>>> Your tenor of your post suggests you made an uninformed Assumption.
>>> I do appreciate the good advice.
>> Hi Ken,
>> I have a skeptical bone, too, and sadly find I make many uninformed
>> assumptions. It's certainly possible I did so here. I encourage  
>> further
>> research from more trusted sources.
>> The tone I strove for was humor-lightened dead serious, but your reply
>> suggests I failed. It might be I spent too many years fruitlessly  
>> telling
>> employees  the dust they raised was bad for both them and me.
>> As I said, the choice of clay condemns us to some clay in our lungs -  
>> no
>> way to avoid it entirely. And the histrionic tendency to exaggerate  
>> dangers
>> these days is not a bus I care to board.  But clay particles are very  
>> small
>> - any particles bigger than 2 um (2/1,000,000) get promoted to silt,  
>> and
>> don't exhibit the plasticity that makes clay so enjoyable. Particles
>> smaller than 2.5 um are too small for our lungs to cough out, so they  
>> stay
>> there. I leave the arithmetic as an exercise for the student. Now,  
>> knowing
>> that each of those particles can slake its electrostatic yearning for  
>> water
>> either with water we add or the water it finds in our our chest  
>> cavity, I
>> personally opt for the first. Please confirm this from reliable  
>> sources.
>> I maintain that protective gear not HEPA-rated does no good, but  
>> please
>> seek out a second opinion (but not from the bozo who taught you to  
>> carve
>> dry.) Carving in your garage means those particles will float around,
>> settling only over hours or days, then recirculating every time  
>> there's air
>> movement to roil the up.
>> As for microcracks in dried clay, there's a good section on it in  
>> Fraser's
>> book, "Ceramic Faults and Their Remedies." And it's a good read if  
>> you ever
>> want to get beyond a superficial knowledge of clay.
>> Best,
>> Jeff
>> Jeff Lawrence
>> jefflawr at gmail.com
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