Table 3.

A comparison of Longyan 325# and IMERYS clays from England and New Zealand.

Product CountryLongyan 325# ChinaSSP (IMERYS/ECC) EnglandPremium (IMERYS/NZCC) New Zealand
Sales (Ktpa)501520
Morphology of clayKaolinite and halloysiteKaoliniteHalloysite
Particle-size distribution
Wt.% <2 μm308599
Wt.% >10 μm3010
Chemistry (wt.%)
SiO2484850.4
Al2O3383735.5
Fe2O30.290.410.25
TiO20.020.010.05
CaO0.160.1tr
MgO0.30.25tr
K2O1.711.2tr
Na2O0.10.15tr
LOI12.412.813.8
Mineralogy (wt.%)
Kaolinite/halloysite7995 (kaolinite)92 (halloysite)
Micaceous material1740
Quartz308 (some cristobalite)
Other minerals110
Modulus of rupture
Dried at 110°C, MNm−21.65.53.4
% Casting concentration63.55755
Fired properties (at 1280°C)
% Water absorption17920
% Brightness949497
% Contraction71311