The fate of former civil defence chief Peter Lim Sin Pang, who was tried for corruption, will be revealed on Friday afternoon.

District Judge Hamidah Ibrahim is set to deliver the verdict in the sex-for-contracts trial.

Lim, 52, is charged with corruptly obtaining oral sex from Ms Pang Chor Mui, 49, the former general manager of Nimrod Engineering, in exchange for furthering her employer's business interests.

The sexual encounter is said to have happened on May 2, 2010, ten months before he allegedly tipped her off about the Singapore Civil Defence Force's need for radiation portal monitors.

Nimrod Engineering participated in the tender when it was eventually called in April 2011.

Defence lawyer Hamidul Haq, arguing that the encounter had been the "culmination of a personal relationship", said the time gap showed that Lim did not have corrupt intent during his tryst with Ms Pang.

But Deputy Public Prosecutor Tan Kiat Pheng had countered that Lim was bought over after the encounter, and that there was no "time limit" on his "servitude".

He faces a maximum of five years in jail, a fine of up to $100,000, or both if found guilty under the Prevention of Corruption Act.