Multi High Lumbered Bars

Detailed below are typical specifications for single crystal cultured quartz multi-high humbered bar quartz, grown on Z-plate seeds and lumbered into several uniformly dimensioned bars.

The individual as-grown crystals are crystallographically oriented and lumbered with several cuts in the YZ plane; thus producing equal sized lumbered bars, as shown below.  In this process, the "top", "centre" and "bottom" bars differ slightly in that while the centre bars are pure-Z material, both the top (+X direction) and bottom (-X direction) bars contain a small quantity of +X or -X material, respectively.  This non-Z material is, in all cases, limited to a thickness not to exceed 2.0 mm.  Seed material in tops, centres and bottoms is centred in the Z direction within a 3.0 mm wide band

Quartz Multi High lumbered bar
Section Drawing

Typical Specifications

Mechanical Characteristics

    Units Typical Values Tolerance
  X-height x Z-width mm 10.0 x 20.0 ± 0.13
    mm 9.0 x 18.0 ± 0.13
  Y-Length mm 200 ± 5
Orientation of X-surface @ Y-axis degrees 0 ± 15 minutes
  @ Z-axis degrees 0 ± 15 minutes
Orientation of Z-surface @ X-axis degrees 0 ± 1 degree
  @ Y-axis degrees 0 ± 1 degree
Flatness of -X lumbered surface mm Flat ± 0.1
Flat Surface finish of -X lumbered surface, Ra   µm 4.0 maximum

Material Characteristics

Handedness   Right      
Infrared α (3500 cm-1)   α -units Grade B: 0.045   Maximum
      Grade C: 0.060    
      Grade II Grade I  
Inclusions (diameter) 25-75 µm cm³ 5 4 Maximum
  75-100 µm cm³ 4 2 Maximum
  >100 µm cm³ 3 2 Maximum
Etch channels   cm² Grade 4: 300   Maximum
Twins and cracks in useful volume   Count None    

Seed Characteristics

Seed centricity Within central 3 mm  
Non-Z material +X growth 2.0 mm maximum
  -X growth 2.0 mm maximum

Marking and Packaging

  • Supplier logo, grind lot number, part number and "Minus X" are marked on the minus-X surface of each bar.
  • Bars are packed in individual cells within double walled cardboard boxes containing approximately 25kg.
  • Total piece count net weight, gross weight and part number are marked on the exterior of the carton.
  • Cartons are appropriately marked for export purposes and affixed to wooden pallets suitable for ocean transport.


International Electrotechnical Commission Standard, CEI/IEC 758, Second edition, 1993-04.

Institute of Electrical and Electronic Engineers Standard on Piezoelectricity, ANSI/IEEE Std. 176-1987.