Average coefficient of expansion from 20 degree to 200 degree C is 3.56 x 10-u, gradually increasing to 4.69 x 10-u at 1000 degree C. Experience has indicated suitability of particular shapes for specific uses. lt remains the responsibility of the user to determine the suitability for his use. To prevent thermal stress cracks on porcelain ware, Silico strongly recommends a heating/cooling rate not to exceed 200 degree C/hour. High Alumina labware temperature change rate should not exceed 150 degree C/hour.
The Glaze No softening occurs up to 1000’C, and it is extremely white.
The resistance to acids and alkalies is excellent, except for hydrofluoric acid.
Glazed inside out except for outside bottom surface and rim.
With lip and flat porcelain handle, glazed inside and out except for rim and top of handle.
Mortars with glazed lip and outside except for oversized bottom.
Depending on the variant, the spatula is glazed and either has a spoon, knob or a spatula on the other end.
Color-reaction or spot plates, glazed except for bottom surface.
Evaporating Dish with Lips, available in varied sizes and glazed finishes.
Glazed all over except for rim, available in all crucible sizes.
Fixed perforated plate, glazed inside and out, except for rim.
Hirsh, with fixed perforated plate, except for rim.
Unglazed for grinding surface. Pestle oversized for hand comfort in grinding.