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Quarz

Quartz

Für diese Artikel bestätigen wir hiermit RoHS-Konformität

  • Si02
  • Density 2,2
  • Fusion Temperature 1900°C
  • Thermal expansion 0,51
  • Hardness Mohs5,5 - 6,5
  • Modulus of elasticity 4,41 x 10 a 20°C
  • Refractive index nd 1,45
  • We mainly work on spectrosil 2000, Spheres between 0,3 and 10 mm

Quality control
A.F.B.M.A.* GRADE TOLERANCES AND TERMINOLOGY.
GRADE TOLERANCE CHART

Tabelle

  • 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.