| Al203,
color white |
| Purety%
99,9 |
| Apparent
porosity (%) less than 1 |
| Density
g/cm3 3,95 |
| Flexual
Strength (MPa) at 20°C 450 at 1000°C 450 |
| Compressive
Strength (MPa) at 20°C 2700 |
| Thermal
Conductivity (cal/cm s °C) 0,07 |
| Thermal
Shock Resistance T(°C) 200 |
| Modulus
of Elasticity (Gla) 400 |
| Thermal
expansion (10-6/°C) 8'1 |
| Hardness
Vickers (kg/mm2) 1900 |
| Kic
MPaVm 1-3 |
| Average
Crystal size in microns 1-2 |
| At
the customer's request we produce highly specific ceramics. |
| |
Quality
control
A.F.B.M.A.* GRADE TOLERANCES AND TERMINOLOGY.
GRADE TOLERANCE CHART |
 |
Basic
diameter: The size ordered which is the basis
to which the basic diameter tolerances apply. The basic
diameter is specified by a fraction plus a decimal or
a decimal only to the sixth place. (example: 1/4'' + .0002''
or .2502'' - 15/64'' +
.0003'' or .234675'').
Basic diameter tolerance: The maximum
allowable deviation of any ball diameter from the basic
diameter, in any shipments to fill orders for that basic
diameter.
Diameter tolerance per ball: The permissible
difference between the largest diameter and the smallest
diameter measurable on one ball.
Diameter tolerance per unit container:
The permissible range of the average diameters of the
individuals balls within any one unit container.
Grade: The numerical value of the diameter
tolerance per ball expressed in a millionth of an inch.
Marking Increments: The standard unit
steps in a millionth of an inch used to express the specific
diameter.
Some materials prevent us from obtaining a better result
of tolerance than those obtained at level 10. On the other
hand, some materials, mainly ceramics, make it possible
to obtain dimensions with a level 4 or 5 , RA is then
higher than in the above table. |
