Technology company Hazer Group (ASX:HZR) completed its commercial demonstration plant's performance and reactor test program, according to a Tuesday filing with the Australian bourse.

The company said the campaign achieved more than 450 hours of continuous operation, with the plant recording a 99.6% production uptime, according to the filing.

Also, the campaign produced "significant" volumes of high-quality graphite, which will be delivered to partners and potential buyers for further testing, the filing said.

Hazer shares rose nearly 3% in midday trade.