In a letter to the intern never mention that the intern will get absorbed into regular rolls. An intern is a person who is a student undergoing a program and is attending your office as part of his curriculum. There are a lot of confusions around such engagements. The EPF/ESI authorities take it as regular employment unless you have proof to show that they are interns undergoing their internship as part of their curriculum only. For this we require a letter from the head of the institution requesting you to take his students as interns. It should also be an institution recognised by a statutory body, University.
As far as possible the letter to intern should contain the company's safety policy and the responsibility of the intern in this regard. a sample letter is like this:
To
Ms ..........
School of ..........Technology
Cochin.
Dear Ms ,
Sub: Organisation Study/ Project/Internship
Ref: Letter from your Institution No .......... dated 26-02-2018
With reference to the above, we are pleased to inform you that you have been accorded permission to carry out internship in our establishment.
Your above assignment is for a period from two months from 5th March, 2018 to 4th May 2018. Accordingly, you may start your internship on 5th March 2018
Your study schedule will be as decided by the company.
During your project study with us you will have to follow the rules and regulations of the company with respect to conduct, discipline and safety and follow the instructions of the officials of the company. You should not disclose any material facts relating to the operations of the organisation to anybody and should observe absolute confidentiality of all the operations of the departments. You are also informed that the company will not be liable for any compensation on account of death or injury leading to partial or total disablement caused to you during the course of your internship/project study with us.
All the best.
For ......................... Ltd
(Manager-Training)
Copy to:
The Head, Academics, School of .................................. Technology, .........