Water content: 20% Porcelain typically runs in the 22-24% range: so this is low comparatively.
Plasticity (IP Atterberg): 11 11 on the Atterberg Plasticity index) is considerd low plasticity. (30 is high plasticity)
Carbonate content (CaCO3): 0% common for porcelain bodies.. no big deal.
Drying shrinkage: 5.4%
Firing shrinkage at Cone 6: 10.3%
Porosity (water absorption) at Cone 6: 0.0%
Dry bending strength: 3.1 N/mm2 bending strength at Cone 6: 39.8 N/mm2
Thermal coefficient (a25-500ºC): 54.3x10-7ºC-1
Assuming they listed drying and firing shrinkage separately: the total shrinkage would be 15.7% The typical average for porcelain generally runs in the 13.5% range. Taking this shrinkage rate, adding in the water content: and finally the 0.0% absorption rate gives me some indication of formulation.
Kaolin only holds water on the face of the platelet: it does not absorb water. So they add more water to increase plasticity: the reason you see higher water content ratings. Secondly, bentonite is the most commonly used plasticizer: it can hold 3 times it's weight in water: further adding plasticity. The higher water content, coupled with bentonite additions is what produces the higher shrinkage rate of porcelain.
In this case you have lower water content and higher shrinkage: why? In this case, either a sub micron ball clay, or polymer plasticizer was used: or a combination thereof. I am going to go with sub-micron ball clay for two reasons: the first is the lower water content. Polymer plasticizers can hold up to four times it weight: even more than bentonite. If either of these two were used, the water content would be higher. Sub micron ball is more in line with the water content: but is also the reason for the 0.0% absorption. At cone 6, sub micron particles would need to be in the 15-18% range to completely seal the body: coupled with finer mesh silica and higher feldspar.
The COE value of 54.3x10-7ºC-1 is shown in it's mathematical formula: you just need to X out 54.
3x10-7ºC-1, to know its 5.43. Typical porcelain runs 5.75 to 6.00 with bentonite and higher feldspar content: which also indicates to me ball clay was used because of this lower value.
Dry bending strength: 3.1 N/mm2; is what we call green strength. This number is on the low side.
Fired bending strength at Cone 6: 39.8 N/mm2: is what we refer to as MOR (modulus of rupture.) decent number.
The black color is from one of 2 things ( my assumptions). it is from magnetite: a naturally occurring iron mineral which is black in color. if memory serves, Italy has a lot of black sand on its beaches: and it could have been milled down for use in ceramics. I think black sand is lodestone, which is also iron bearing.
My thoughts on the matter anyway.