Cutting GRP-120-1/2 BLK

Converting to english, I expect you mean you want to know what tool to use to cut GRP tube without damaging the cut or splintering the end when you try to insert a cable?

If that is so, then I think there are a few solutions,

1. you must tape the end before cutting and keep taped till cable is inserted.

2. Pipe Cutter + guide sleeve at opening

3. Water jet cutter

Of course if the GRP is brittle while 3. will give a good end the cable will probably damage it on insertion so, like 2. insert a guide sleeve during the feed process to protect the end