I hope this question belongs in here; I cannot think of any other better place to ask it.
Which kind of material is used in dichroic halogen bulbs to attach the bulb itself to the reflector and keep it in there? Looks to me like a ceramic or some kind of terracotta, but I wish to know the exact kind and if it is available for home use or, in case it isn't, a good recommendation as a domestic substitute. Of course, I understand it's main property is, appart from its hardness, the ability to be fireproof and/or refractory, due to the high temperatures being reached in there. For this same reason, something like epoxy resin or anything plastic based probably wouldn't work as it would melt or even burn.