Hi all,

Over the last few days we got in a PBT job that we’re having issues with (first time running this material). To bring the parts close to tolerance (one dimension is in, the rest are under some a small amount, others a large), we’re having to pack the part out big time. Currently injecting around 16k psi with a 60% holding, temps from 440-460 F, mold at 140 F, also a somewhat slow injection to keep the injection profile under control (set at 10-15%). Any suggestions on things to try to get this part to shrink less? We’re cooling around 20 seconds but the parts are barely touchable after they come out.

Side note, customer provided their set-up sheets which their numbers are less than ours (1100 psi?, 440-450F, cooling for 15 seconds) and we get really bad results when we do this. Any suggestions would be appreciated.

Thanks