Hi uloolu, and welcome to the board.
What an interesting question for a first one!
Ivo has given you lots of info to look through and you may well find exactly what you are looking for there. If not, then my husband, John, has a lot of information about this type of glass fibre, but needs more info to be able to help you.
You're very welcome to write to him using the little envelope to the left of the page, under my name, and give a little more info on type of photocatalytic fibre, rutile or not, length and thickness of fibres ( Or do you require it as matting fibres?) and if they would be required to melt at a particular temperature.
It would also help to know your location if he is going to be able to give suppliers within reasonable distance.
Hope we can help!