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1.material:borosilicate sight glass, 2.type:3.3, 3.guarantee the quality - details see: https://www.machineto.com/borosilicate-sight-glass-optical-lens-10211321

borosilicate sight glass,borosilicate float glass,borosilicate glass 3.3.

The high boroscilicate glass is slightly has the cyan color to approach in the colorless glass, in the glass insulating screen in projecto XRB1 is the phosphate absorption glass, XRB3 is the silicate absorption glass. But they not remarkable absorption visible ray is the absorption produces the thermal near-infrared optical fiber massively.

every need candle-power high and needs to separate eliminates the thermal situation to be possible to apply!Applies on the cold light lamp source product: Like operating room cold light lamp, slide projector, projecting apparatus.