Made of natural fused quartz glass material, we produce sight glasses for high thermal load, front cover glasses for UV-lamps and similar less optically demanding components. Since for such applications an optical quality is of secondary concern and a high transmissivity below 200 nm usually is not required, natural fused quartz glass is a good material choice for the fabrication of such and similar parts.
Natural fused quartz glass materials are produced by the melting of natural quartz crystals. These materials cannot offer such a high optical quality and purity as our synthetic optical grade fused silica glass, but they are much more economical, especially for large dimensions. The low coefficient of expansion and the thermal strength are comparable to those of optical quartz glass material. Also the chemical resistivity is very high and on the same level as for fused silica. Besides that, the high UV-transmission down to about 200 nm is a key property for many applications.
Our fused quartz glass materials are made transparent by a more economical mechanical polishing process. The polishing finish does not offer optical-grade quality in regards to flatness and surface quality, but the polished glass is clear and has almost no distortions or inhomogeneities when directly looked through with the naked eye. The possible thickness tolerances and the parallelism of the polished material is relatively coarse. But this is usually not an important factor in most areas of application for which these sight glass grade materials are predestined.
To request a quote for sight windows of natural fused quartz glass with sight glass quality, please click on the following button:
For some thicknesses of our fused quartz glasses, we offer our 48h Express Service for the fabrication and shipping within two working days. Below please find the available thicknesses within the express service. Please select the express service option in the inquiry form:
Max. dimensions within express-service 500 mm x 500 mm.
Show optical transmissivity of Fused Quartz Glass
(Sight glass quality)
All given details and specifications are mean reference values and are not guaranteed. In addition, please consider the "Notes on technical specifications"