Hello,
As SES Research has upped their prices of C60 powder over three times, I have been looking out for other possible suppliers. I have been in contact with many other companies and from SES product description I have had the understanding that vacuum oven dried C60 in purity 99.9% and 99.95% is solvent free.
I have been given feedback that, at least for other vendors, even vacuum oven dried C60 in purity 99.95% and 99.9% contains between 200 to 300 ppm of solvent residues. Is this level of solvent residues to be expected; is this level of residues dangerous if the C60 is consumed over longer period?
With Best Regards,