Sanded or non-sanded grout for glass mosaic tiles?

[cdiwadkar]

Should I used a sanded or a non-sanded grout to grout 1" x 1" glass mosaic tiles? These tiles are on sheets that are 1' x 1' squares.
I've read that non-sanded is better because it won't scratch the glass but I was reading a PDF from a manufacturer that said to use standard sanded grout!
Are there any pros and cons to sanded vs. non-sanded apart from the scratching issue?
Thanks!
-Chait

[jadnashua]

How much of a gap is there between the tiles? If greater than 1/8" as shipped, then you don't really have a choice - you have to use sanded. If it is 1/8" or less, then you could use unsanded; sanded is a pain to get into small joints. Most glass is made of quartz. Sand is mostly quartz. There is sand in sanded grout. Things that are the same hardness will scratch each other. The sand in the sanded is probably quite fine, but like sandpaper in finer grits, it still can scratch things. So, never having installed any glass tile (I"m not a pro), depending the spacing, you may not have a choice...I'd go with the manufacturer's recommendation for YOUR tile, not a generic.

[Davy]

I normally use sanded grout with glass tiles. You aren't walking on the grout, only filling the joint. I've never seen scratches from the grout but I guess it's possible.

[claycarson]

I would look at manufacturer's specs, but I agree with Jim above. Larger gaps require sanded. We recently did a glass mosaic floor with sanded and it came out fine - no scratches.