I've seen these referred to different things (Radlam Bolts, ceramic bolts) but basically should they be being phased out on older doors or are they still acceptable?

i would still accept them in use so long as the occupants of the premises are familiar with the premises/ layout and how to operate the glass bolts 9possible signage may be required) The disadvantages with them are that people are less likely to check the door for correct operation as you normally need a key to safely release the tube to check the lock and door for correct operation. also people are willing to break the tube as the hammer normally goes missing. So in public places i would not be keen on the use but if you have them installed and happy they will be operated correctly when needed then that's OK in my books but i wouldn't be keen to see them on any new installations. Phil

Clairel There is nothing wrong with the glass tube Most factories I have dealt with do not use them because when they were broke could never replace them. Also need to check fire doors regularly and the push bar system is always the easiest. Which ever you adot do not mix half and half as in a real emergency people will be confused if you have both types Alan

Going slightly off track. We used to have a substantial number of these and they were always checked by removing the glass tube every month. The reason for this was that they can be prone to jamming. On one occasion the person checking them broke a tube while replacing it and suffered lacerations to the hand which required stitches To reduce the risk of this occurring again the glass tubes were replaced with ceramic ones. These were quite easily broken in am emergency but did facture without the shards produced by the glass ones In the longer term they were in turn replaced by Cooper Bolts which incorporate a battery powered alarm http://www.safelincs.co....c-Bolts-Outward-Opening/

Thanks for the all the info, I shall take it on board.