Teal'C said lots of things in season 1 that are not true He claimed the hyper drives could only got 4x the speed of light (might be wrong on number but it was a lot slower then they actually go, which Carter even points out later in the episode.)
Considering the Goa'uld kept the Jaffa in a fairly primitive tech state they probably were not aware of super hard transparent materials.
Considering the Goa'uld kept the Jaffa in a fairly primitive tech state they probably were not aware of super hard transparent materials.
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