Building a toxic free home, plastic piping on central heatin

[newbie29]

Odd question, here goes ….trying to limit any toxins in my new build. From insulation to paint choice...flooring.

My questions relates to underfloor heating, the plastic pipe that is used is pex piping, logically thinking the pipe heats up. Does Plastic piping tend to release air bourne toxins when heated up. I hear warm water or drinking water ran through pex piping has been tested and contains toxins. Now worried about the materials used in underfloor heating pipes.

Thanks All

[newbie29]

its more airborne toxins that are released from the plastic when heated up from the pipe work that im worried about. i have joists with wooden flooring hence the pipes wont be buried in concrete.

Does plastic cure over time, consequently reducing any airborne toxins

good point i will ensure my plumber uses copper on all hotwater pipes.

cheers