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
|X-height x Z-width||mm||10.0 x 20.0||± 0.13|
|mm||9.0 x 18.0||± 0.13|
|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|
|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|
|Etch channels||cm²||Grade 4: 300||Maximum|
|Twins and cracks in useful volume||Count||None|
|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.