We are asked regularly, which kind of glass was used in humidor xy. The used glass is different depending on the manufacturer and product. For our GERMANUS humidors I follow this view: My opinion is rather tolerant of both kinds of glass, acrylic glass and genuine glass.

Genuine glass makes a nice impression.
Acrylic Glass got some advantages on its side, however. These are in my view:

-          Better Light protection

-          Resitant against Scratches

-          Less risk of breaking/damage

-          Affordable, but can be hardly distinguished optically from genuine glass, if of good quality

In general most humidors of the lower or middle price glass are made with windows of acrylic glass.