From the article ‘rare’ is an adjective.
Dateline 2022-05-27, Argus:
Malaysian state-owned Petronas’ trading arm Petco has sold a rare atmospheric residue (AR) cargo for prompt-loading from Pengerang, as its refining and petrochemical joint venture with Saudi Arabia’s Saudi Aramco is in the process of restarting.
The 300,000 b/d Pengerang refinery and cracker complex, run by the PRefChem 50:50 joint venture between Petronas and Saudi Aramco, was shut after an explosion in March 2020, and restarts were delayed several times after. It possibly started feeding crude into its primary units in early-May, according to market participants.
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Wata - Malaysian Oil and Gas Engineer 