I don't know of any specific chains made for uPVC doors, but if its a good make of door you should have aluminium strenghteners in side the main framework as opposed to galvanised steel.
If you have ally (as I have) you could always drill some pilot holes and use self tappers as opposed to the wood screws supplied. I also put a little araldite on the back faces of mine to help it hold, mind I've not had a burglar try it yet !!!.
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