Dematerialisation is the process by which physical certificates of an investor are converted to an equivalent number of securities in electronic form and credited in the investor's account with its DP. In order to dematerialise certificates; an investor will have to first open an account with a DP and then request for the dematerialisation of certificates by filling up a dematerialisation request form [DRF], which is available with the DP and submit the same along with the physical certificates. The investor has to ensure that before the certificates are handed over to the DP for demat, they are defaced by marking "Surrendered for Dematerialisation" on the face of the certificates.