[TheForge] Source for Boron Nitride Powder

[xlch58 at swbell.net]

I know this is off topic ( but it might not be as Boron Nitride powder 
is an excellent high temp lubricant used in industrial forging)  but 
does anyone know of a source for small quantities of -5 micron Boron 
Nitride powder?  The only supplier I can find has a minimum of 5lbs, 
which is at least five times too much for me in price and quantity. 

Charles