1,The chemistry composing of the Yixing Purple Clay(%) that from Shanghai silicate graduate school (2001.1):
SiO2: 58.39 / Al2O3: 20.12/ TiO2: 1.08/ FeO: 0/ Fe2 O3(Total): 8.38/ K2O: 3.38
Na2O: 0.06/ CaO: 0.25/ MgO: 0.57/ MnO: 0.01/ Cr2O3: 0/ PbO: 0 / Fire loss:7.32
It is proved that the Yixing Purple Clay don't contain lead and chromium.
is The China Ceramic Quality Certificate about our Yixing purple tea pot
Please see the pictures
The following content is included in this certificate:
unit:The examination of ceramic-test center of China.
examination of ceramic-test center of China is best
ceramic-test organization in China.)
Yixing Zisha craftwork factory.
Bao Trading Co,Ltd¡¯s General Company)
of check up:Yixing Zisha Tea pot, C/N of the samples:001,
C/N of the report:001,
subject of check up: heat stability and other
of the report:3,Jun,2000.
of check up:
stability : 5 pcs samples,through
x 30 mim,to water of 20 degrees centigrade
a circulation ,no find the phenomenon of the samples
splited and other problems.
find lead (mg/L)
Zhang Yun er etc,