CPP (Clarified PP or random copo PP)

[Wiseco]

Hi all,

I have some questions about random copo PP.

1- What's the suggested melt temp for injection?
2- Is it oil resistant? (fish oil, mineral oil...)
3- Why an amber colorant that have a somekind of wax as carrier will make green part? Just like the colorant have burned...Does the wax is incompatible with PP?

Thanx!

[DwightDixon]

Ask these questions to your suppliers. PP copolymers come in many grades and melt indexes and the processing temperatures need to also reflect the L over w ratios you have in your molds. I usually start around 410 F and go from there.

Your colorant house knows what will happen to the color if you over heat it. They should have been informed by you the plastic you were intending to color and should have provided an adequete color concentrate in a compatible color carrier resin. If they did not, maybe it is time you tried another color house.

[Wiseco]

Thanks Dwight.

I was too much low in temp setpoint. Probably it the causes of all my problems.

Sometimes suppliers are not there to answer questions quick so this is why I came here. I also thought to subscribe to matweb.