Stock in the Nikkei-225-listed firm was down 330 yen (8.06 per cent) as the market neared the close on Friday, with the wider market fractionally in the green.
Shares in Mitsubishi Materials plunged more than eight per cent today after it admitted to falsifying product data, the latest major Japanese firm to acknowledge problems with quality control.
Stock in the Nikkei-225-listed firm was down 330 yen (8.06 per cent) as the market neared the close on Friday, with the wider market fractionally in the green.
Company boss Akira Takeuchi was due to brief reporters on the scandal after the market close.
The firm said in a statement Thursday the affected products included rubber sealing materials used for packing and gaskets, often used to prevent leaks of liquid or gas from pipes in a wide variety of industries including aerospace and automobiles.
The scandal also affected brass strip products for cars and other products, it said.
