GE 124 Quartz
GE 124 quartz is used for quartz microscope slides and coverslips.
Typical Trace Element Composition (ppm by weight)
Optical transmission properties provide a means for distinguishing among various types of vitreous silica as the degree of transparency reflects material purity and the method of manufacture.
Specific indicators are the UV cutoff and the presence or absence of bands at 245 nm and 2.73 micrometers. The UV cutoff ranges from about 155 to 175 nm for a 10 mm thick specimen and for pure fused quartz is a reflection of material purity.
As the transmission curve illustrates, GE 214 fused quartz has a UV cutoff (1 mm thickness) at < 160 nm, a small absorption at 245 nm and no appreciable absorption due to hydroxyl ions.
High IR Transmission
The IR edge falls between 4.5 and 5.0 micrometers for a 1 mm thick sample.
GE 214/124 electrically fused quartz is a very efficient material for the transmission of infrared radiation. Its infrared transmission extends out to about 4 micrometers with little absorption in the "water band" at 2.73 micrometers. This makes Momentive Performance Materials's electrically fused quartz different than flame fused quartz (often referred to as "wet" quartz). This difference is seen in the transmission for the IR range. The IR Transmission figure illustrates this difference.
Conversion to other thicknesses can be accomplished with the following formula:
T = (1-R)2 e -at
T = percent transmission expressed as a decimal.
R = surface reflection loss for one surface.
e = base of natural logarithms
a = absorption coefficient, cm-1
t = thickness, cm
Index of Refraction for Fused Quartz
Graphs compliments of supplier.