Mitsubishi Materials Corp. said Thursday it has found more examples of product data falsification at three of its subsidiaries, in the latest in a series of data cheating scandals.
Mitsubishi Aluminum Co., aluminum product maker Tachibana Metal Co. and automotive and industrial equipment parts maker Diamet Corp. have all been found to have tampered with inspection data.
Mitsubishi Aluminum also rewrote aluminum product data that did not conform to standards agreed with clients.
The company shipped products with falsified data to a total of 115 companies. In some cases, it measured product data in ways that did not confirm to standards set by Japan's national standardization body or requests from client firms.
Similar falsifications have been found at a Tachibana Metal plant and a Diamet plant producing automobile parts. The companies shipped affected products to 307 firms and 73 clients respectively.
Mitsubishi Materials has been conducting internal probes following revelations last year about data falsification at Mitsubishi Cable Industries Ltd., Mitsubishi Shindoh Co. and Mitsubishi Aluminum.
Mitsubishi Cable Industries President Hiroaki Murata stepped down from his post on Dec. 1 after the company continued to ship affected products despite knowing the data had been fabricated, fearing it could lead to claims for damages from customers and bankruptcy.
The nonferrous metal and industrial product group is among a number of Japanese manufactures that have recently been mired in product quality scandals, which have included product data fabrication by Japan's third-largest steel-maker Kobe Steel Ltd. and a subsidiary of fiber maker Toray Industries Inc.