3mm glass should be tempered to increase its strength. If it's not tempered it could crack from the heat and/or water splash. Thinner glass is better so less light is filtered but if thinner glass is used it needs to be tempered. Glass supplied with reflectors is always tempered, as far as I know.
Most halide reflectors that come with shields such as the lumenmax 3 use low-emissivity glass. This is because such reflectors use DE bulbs which require a UV shield. SE bulbs do not require a UV shield so any glass can be used.
Tempering is not always offered by glass shops. Most glass shops will have to cut the glass and then send it out for tempering or order the tempered glass pre-cut. You cannot cut or drill glass once tempered. If you did not ask for tempered glass, you didn't get tempered glass. I would recommend either ordering new glass which is either thicker or tempered.
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