High-temp filtration of carbon black in Polyolefin samples

[er_radical]

I am currently using the Agilent 1260 Infinity High-Temp GPC system and the Sample Prep System. I have been having issues completely filtering out the carbon black from my Polyolefin samples.

I have been filtering the samples once through a 1 um fiberglass filter. I have also tried to filter each sample 4 times using a new filter slot each filter round. Secondly, I have tried filtering with celite in hopes the carbon black would stick to it but it did not work.

I was quoted over $12k for a batch of 50 ultra fine fiber glass fibers and would appreciate any low-cost solutions to this issue. Thanks!

[DR]

Is either getting the fines out of your carbon or ordering a version without fines in it an option? Those may be cheaper options than the expensive sample filters.
Does the carbon foul up the chromatography?