Digital BW, The Print

I have printed on a sample sheet of Hahnemuhle White Velvet and like 
the results.  I notice that it has 25% rag content, but is supposed 
to be acid free.  Will this be as archival as a 100% cotton paper? I 
know it has OBAs.  I am currently using photorag with UT2 inks and 
want to be sure of similair longevity. 

Thanks,
Peter