Can electronic holdings be converted back into Physical Certificates?
Yes. The process of reconverting demat shares to physical shares is called rematerialisation. If one wishes to get back his securities in the physical form, one has to fill in the RRF (Remat Request Form) and request his DP for rematerialisation of the balances in his securities account.

When to rematerialise?
Security settlement in Indian securities markets takes place only in the demat form and hence, it is advisable to hold shares in the demat form only to quickly sell shares as and when desired. An investor can rematerialise shares only when he has no intention to sell his holdings and wants to hold shares only for the purpose of investment for the long term.