The best seal for this application you can get it from a seal company name as Burgmann.
www.burgmann.com
or send me an e-mail with all stuffing box dimensions.
rakesh@burgmannme.com
Hi
Are you using single or double seal for this application.
If you are using single seal go for SIC/SIC seal faces and if possible with clear water flush.
If you are using double seal , inboard seal ( process side ) should be with SIC/SIC seal faces and outboard seal can be carbon/sic seal...