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100% Testing and Inspection

To ensure maximum lifetime in your process and stable and accurate rate control, each crystal is examined for:

  • Resistance-Resistance is checked to assure measurement stability and longer coating life. Resistance is an indicator of electrical contact and electrode adhesion.

  • Frequency-Starting frequency within a small specification range is verified to ensure accurate thickness measurement.

  • Curvature-An electrical test for curvature is performed to assure resonance stability. Poor curvature results in measurement stability degrading more rapidly.

  • Visual Conformity-Each crystal is inspected for electrode uniformity, surface flaws, and other imperfections that are indicators of poor electrode adhesion and contamination.

Right Crystal - Thickness Controller

JJK quartz monitor crystals meet all your requirements for reliability, availability and affordability. JJK monitoring crystals are produced 100% in house – from blank quartz crystals to the finished product-ensuring unparalleled quality no other company can guarantee.


  • Advantages

    Plano-convex configuration suppresses unwanted modes for greater accuracy.

    AT-cut crystal orientation enhances stability over a wide range of operating temperatures.

    Improving of adhesion underlayer from electrode-to-crystal assures the crystals' reliability and long-life.

    Gold or silver electrode coating for maximum electrode life.

    100% testing of each crystal' s frequency and activity (series resistance).

    Compatibility with all JJK sensor heads and most other manufactures instruments.

    Clean room processing to avoid particulate contamination.

  • Delivering Just the Right Crystal

    Available in 5 and 6 MHz with gold, silver, or stress reducing alloy electrodes, JJK quartz monitor crystals are produced to stringent specifications and carefully inspected to assure high yields and optimum reliability.

    Our AT-cut plano-convex design reduces errors in deposition rate and thickness by minimizing spurious vibrational modes.

    We have abundant inventory to meet both your immediate and long- term requirements.

    We also offer the flexibility to produce crystals to your specific sizes and frequencies.

  • How to Choose the Right Crystal

    Our continuing research into quartz crystal characteristics results in ongoing improvements to offer the highest reliability in your process.

    We recommend gold crystals for most applications.They have low contact resistance, high chemical stability. The gold electrodes crystals are best suited for low stress material coating monitoring, such as gold, silver, copper film thickness control.

    Silver crystals will provide superior performance in processes with high heat loads, such as sputtering.They may also improve the deposition of oxides.

    Alloy crystals are recommended for optical coating with dielectric materials and for semiconductor processes with high-stress materials，such as SiO, SiO 2 , MgF 2 , TiO 2 and so on.