Final Setting Time of Cement

Testing continues past the initial set using the Vicat apparatus fitted with an annular attachment. Final setting time is reached when the needle makes an impression on the paste surface but the annular ring leaves no impression, indicating the paste has hardened.

IS 269 specifies a maximum final setting time (typically 600 minutes for OPC), placing an upper bound on how long a structure or formwork needs to remain undisturbed after placing.