A 100 minimum? Years ago MSC had a minimum if I remember correctly. So I ordered from Enco.. I have a thing against MSC... just checked an item, they are selling it for 200% over what the manufacturer sells it for directly. I just can't see paying that just to keep them in business.I bought some from Travers last year to case harden some swivel vise jaws . Seems to work fine. The only thing I would suggest is stay way from the fumes when you dunk the park in the powder. I don't no what the fumes are but the smell was terrible and made me cough a couple of times. Not sure what the depth of hardening is but after all it's just surface hardening.
Just keep in mind Travers now has a $100.00 minimum order.