Newport "Near Zero" actually, meaning less that 50 ppm and there are five zeros after the decimal place, before a significant number at 3.5 ppm.
We only paid to have one full blown analysis of the residual oil, but the latest schedule for a further analysis of that analysis, is later this this week. Specialty Analytical picked up the individual standards for all of the carcinogenic compounds discovered at any levels, and have added additional steps to isolate just those compounds for more precise testing.
I agree, I believe on the S.P. site they said cold trap is the way to go.
Some heavier ones are removed by winterizing, and some lighter ones when you vacuum purge the oil, but the easiest way that I've found to remove it, is to discharge the cans of liquid butane into a container (cold trap) that is at 85F and pump off the butane that turns to a vapor, never pumping the pressure below zero (14.7 psi absolute). That leaves the contaminants behind in the cold trap.
