Grog Sizes?

[Biglou13]

I've seen where recipes call for 48f grog which I've seen applied to mullite

We have a bag of 35-50 from christy minerals

I've seen literature referring to screen, mesh sizes

I'm confused you say potato I say potatoe

 

Can some one educate me please

[neilestrick]

Screen, sieve, and mesh have always meant the same thing in my experience. What varies is how they define the mesh size. Sometimes it'll say 35-50 like your bag there, which means they first passed the material through a 35 mesh screen to get all the big stuff out, then passed it through a 50 mesh screen to get all the small stuff out. You'll also see things listed like '50 and fines', meaning they only passed it through a 50 mesh screen, so you're getting everything that's 50 mesh and smaller. HERE is a nice chart about mesh sizes.