PHOTOMULTIPLIER ENVELOPES
Envelopes for photomultipliers are manufactured in many different configurations. They range from 19mm to 125mm in diameter with window materials of Pyrex, Schott 8250, ultra-violet transmitting Schott 8337, quartz and magnesium fluoride. End windows can be plano-plano, piano-concave or domed and may be round, hexagonal or square.
![Photo Envelopes](https://moores-glass.co.uk/wp-content/uploads/2018/07/Photo-Envelopes-.jpg)