Polycarbonate's main selling point is its crystal clarity, so it has applications in everything from safety goggles to baby bottles.
But if your safety goggles end up with little black specks in them, it's because the resin has picked up tiny deposits of burnt-on carbon from the flights of your screw and carried them right through into the mould.
Barrel Blitz Universal can help you to purge all that out before you let polycarbonate anywhere near the machine.
