quality control

The main idea of Quality Assurance System (QAS) applied at Crystal Ltd. is complete correspondence of ready products to their Specifications.

This became possible due to the following:

  • The QAS are totally integrated into the whole enterprise.
  • Every employee takes part in QAS with exact definition of his role in it.
  • The staff of every level is being regularly trained on QAS.
  • Every product is produced in accordance with Quality Control Process Chart (QCPC) that is specific for every products type.
  • Each lot of product is traced during production process at every stage. During technological process the every module can also be traced, if necessary.
  • First of all the products are inspected after each technological process, and every lot of product passes the final outgoing inspection additionally.
  • The most important parameters are measured repeatedly at different stages of technological processes.
  • Use of Crystal's product features – thermoelectric material in shape of plates – for 100% inspection of electro-physical parameters of thermoelectric material.

Besides the quality control during the technological processes the other important part of QAS is the Outgoing Inspection.

The Outgouing Inspection includes the following control stages:

For thermoelectric elements:

  1. Appearance inspection;
  2. Geometry & dimensions inspection;
  3. Inspection of adhesive strength of "element-conductive pad" solder joint;
  4. Coating wetting ability to solder;
  5. Electric conductivity;
  6. Figure of merit.

For thermoelectric modules:

  1. Appearance inspection;
  2. Geometry & dimensions inspection;
  3. Electric parameters measurements (RAC, Figure of merit);
  4. Burn-in or temperature cycling test.

Certificate ISO 9001: 2015

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