Autumn Downey on wed 4 aug 99
I forgot to say that this is a cone 5-6 clear glossy glaze. A little matt
sometimes in the cool parts of our kiln. A couple of people have asked so
thought I'd better send to the list.
>> Ron Roy Clear
>> =============
>> F-4 FELDSPAR........ 31.00 31.00%
>> SILICA.............. 21.00 21.00%
>> FRIT 3134........... 5.00 5.00%
>> GERSTLEY BORATE..... 10.00 10.00%
>> EPK KAOLIN.......... 17.00 17.00%
>> WHITING............. 13.00 13.00%
>> TALC............... 3.00 3.00%
>> ========
>> 100.00
>>
>> CaO 0.54* 12.11%
>> MgO 0.10* 1.64%
>> K2O 0.05* 1.90%
>> Na2O 0.14* 3.48%
>> TiO2 0.00 0.07%
>> Al2O3 0.35 14.23%
>> B2O3 0.16* 4.42%
>> P2O5 0.00 0.05%
>> SiO2 2.60 61.90%
>> Fe2O3 0.00 0.21%
>>
>> Cost/kg 1.55
>> Si:Al 7.38
>> SiB:Al 7.84
>> Expan 7.05
>>
>> Autumn Downey
>
Ron Roy on sat 7 aug 99
Hi Autumn,
I see you have the B2O3 in unity in the molecular formula below. John
Hessleberth pointed out to me that I was in error in doing it that way. I
agree with him and no longer look at glazes that way.
RR clr (cone 6) with B2O3 out of flux unity.
-----------------
F4 SPAR............. 31.00
SILICA.............. 21.00
F3134............... 5.00
Gers Borate 9/97.... 10.00
EPK................. 17.00
WHITING............. 13.00
TALC................ 3.00
----------
Total......................100.00
FORMULA & ANALYSIS
------------------
*CaO........ .66
MnO2....... .00
*MgO........ .12
*K2O........ .06
*Na2O....... .17
Fe2O3...... .00
TIO2....... .00
B2O3....... .19
AL2O3...... .42
SiO2....... 3.08
P2O5....... .00
RATIO 7.35
EXPAN 448.77
WEIGHT 299.55
>----------------------------Original message----------------------------
>I forgot to say that this is a cone 5-6 clear glossy glaze. A little matt
>sometimes in the cool parts of our kiln. A couple of people have asked so
>thought I'd better send to the list.
>
>>> Ron Roy Clear
>>> =============
>>> F-4 FELDSPAR........ 31.00 31.00%
>>> SILICA.............. 21.00 21.00%
>>> FRIT 3134........... 5.00 5.00%
>>> GERSTLEY BORATE..... 10.00 10.00%
>>> EPK KAOLIN.......... 17.00 17.00%
>>> WHITING............. 13.00 13.00%
>>> TALC............... 3.00 3.00%
>>> ========
>>> 100.00
>>>
>>> CaO 0.54* 12.11%
>>> MgO 0.10* 1.64%
>>> K2O 0.05* 1.90%
>>> Na2O 0.14* 3.48%
>>> TiO2 0.00 0.07%
>>> Al2O3 0.35 14.23%
>>> B2O3 0.16* 4.42%
>>> P2O5 0.00 0.05%
>>> SiO2 2.60 61.90%
>>> Fe2O3 0.00 0.21%
>>>
>>> Cost/kg 1.55
>>> Si:Al 7.38
>>> SiB:Al 7.84
>>> Expan 7.05
>>>
>>> Autumn Downey
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
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