Suzhou Tianmai Thermal Technology's (SHE:301626) net profit attributable to shareholders in the first half dropped 80% to 19.1 million yuan from 94.5 million yuan a year earlier, according to a Shenzhen bourse filing on Friday.

Earnings per share fell 79% year on year to 0.17 yuan from 0.82 yuan.

Operating revenue rose 10% to 559 million yuan from 508 million yuan in the previous year.

The Chinese manufacturer of thermally conductive and heat-dissipating products' shares closed 3% lower.