PHOENIX -- Suntron Corp. is using Applied Materials, claiming unfair business practices on the part of the maker of semiconductor gear. Suntron seeks over $20 million in damages.

In the suit, Suntron claims it spent millions of dollars on raw materials and other inventory-related costs as result of false promises of business from Applied Materials. The suit alleges a other unlawful acts and unfair business practices as well.

Suntron provided more than 7,000 different finished products to Applied Materials, Suntron said in a press statement. The lawsuit claims that Suntron has been left with more than $18 million worth of unused and obsolete inventory.