Ceramics

• Al ₂ O₃, 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.

• 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.