Sugar residue and extrusion

Depends on the exposure time, not just the temperature, and how much sugar there is relative to the PP. Sugar has decomposition temperature of about 180 - 190 C. Burnt sugar stinks bad, not even a chemist likes it, and it will leave black specs in the resin. Since this recycled PP, maybe the expectations aren't as high?

John Aspen Research, -

Opinions expressed herein are my own and may not represent those of my employer.

Thanks, John. I figured it would stink, but it's not a huge issue with this recycled PP. I was more worried about any adverse reactions with the PP. It will be used in products that need a certain amount of UV stability. AO and a HALS type stabilizer are added, but if there are enough radicals around produced during extrusion, even those can be overwhelmed.

I'm going to heat age it at 150 C for 120 hours, checking the melt flow before and after.

robre