Why doesn't a fluorescent lamp implode even though the pressure difference is very high?

According to Wikipedia, the pressure inside a fluorescent lamp is 0.3% of the atmospheric pressure, so the pressure difference between the outside and the inside of the lamp is almost equal to the atmospheric pressure which is 1 bar or 14.7 psi.

Now according to this and this, glass shatters at an overpressure of about 1 psi, and sometimes even less than that.

So why doesn't the difference in pressure between the outside and the inside of a fluorescent lamp cause the glass to shatter ?

Submitted February 02, 2016 at 08:20AM by Hurricane93 http://ift.tt/1nCXIXi