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UV-stop Quartz Tube

　　This Ce doped glass can stop nearly all the radiation of ultraviolet ray of UV-B&UV-C and big proportion radiation of ultraviolet ray of UV-A.it is an ideal material which stops ultravilet ray and set out maximum visible light .it serves as the material of quartz alogen lamps ,high density discharge lamps and other UV light,which prevent the harm to the skin of the people and the things which has to be under the exposion of UV radiation and set out the maximum visible light at the same time .
　　For detailed dimensional toletance and technical data please see table I，table II,table III, tableIV.

　Dimensional Tolerance (table I)

Range of 0D	0D	WT	Siding	Out of Round	Bow/1220mm
≤6mm	±20％	±10％	12％	2.0％	2.5mm
6.0-15.00m	±1.25％	±8％	10％	1.5％	2.5mm
15.00-20.00mm	±1.25％	±10％	15％	1.5％	2.5mm
20.00-25.00mm	±1.25％	±10％	15％	1.5％	3.0mm
25.00-30.00mm	±1.35％	±12％	15％	1.5％	3.0mm
29.00-38.00mm	±1.35％	±12％	15％	1.5％	3.0mm

　Chemical composition&OH (table II)

Cr	Ge	Fe	Mg	Ti	Ca	Al	Na	Li	K	OH
20	0.4	1.5	0.4	100	1.0	16	2.3	0.5	2.0	＜25

　Physical Properties (table III)

Density 20℃　kg．m^-3(×10³)	2.2
Coefficient of expansion 25-300℃ c^-1(×10^-6)	0.56
Softening point(℃)	1630
Annealning point(℃)	1180
Strain point(℃)	1100
Youngs modulus(pa)	7.3×10⁵

　Spectral Transmission at 1.0mm Thickness (table IV)

nm	＜220	230-280	290-330	350	450	550	590	780
％	0	＜15	0	15	88	92	93	93

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