This tear gas canister was found in Tahrir on November 20th 2011, photo by Maggie Osma via @Catherina_News
This type we have definitely seen before.
Produced by Combined Tactical Systems, Inc – related to many of the other tear gas used by SCAF during the early Arabic winter.
Material data safety Sheet – MSDS
Product Catalog – page 4
Combined Tactical systems – Description
This identifiable CS canister was found in Tahrir, photographed by @beko120
Looks like a very familiar case.
If past experiences is anything to go by (review the Tah9 case), this is produced by Federal laboratories. And one can read the labeling “518E RIOT CS”
Any further info. Please make a comment below or tweet @tg_id