Schott NG4 Neutral Density Filter

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Schott NG4 Neutral Density Filter
Categories:	Ceramic; Glass; Optical; Filter
Material Notes:	Ionically colored glass. Data provided by the manufacturer, Schott Glas Mainz.. Similar glasses include NG3, NG1, NG5, NG9, NG10, NG11, NG 12
Key Words:	DIN N0.27
Vendors:	No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
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Physical Properties	Metric	English	Comments

Density	2.43 g/cc	0.0878 lb/in³

Chemical Properties	Metric	English	Comments
Acid Class, SR	3.2	3.2
Alkali Class, AR	2	2
Stain Resistance Class, FR	1	1

Thermal Properties	Metric	English	Comments
CTE, linear	6.70 µm/m-°C @Temperature -30.0 - 70.0 °C	3.72 µin/in-°F @Temperature -22.0 - 158 °F
	7.20 µm/m-°C @Temperature 20.0 - 300 °C	4.00 µin/in-°F @Temperature 68.0 - 572 °F
Transformation Temperature, Tg	483 °C	901 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.51 @Wavelength 587.6 nm	1.51 @Wavelength 587.6 nm	He
Transmission, Visible	36 % @Wavelength 700 nm	36 % @Wavelength 700 nm	Internal transmittance of 39% at 700 nm.
IR Transmittance	60 % @Wavelength 2600 nm	60 % @Wavelength 2600 nm	Internal transmittance of 65% at 2600 nm.
UV Transmittance	<= 0.60 % @Wavelength 200 - 340 nm	<= 0.60 % @Wavelength 200 - 340 nm
	21 % @Wavelength 390 nm	21 % @Wavelength 390 nm	Internal transmittance of 23% at 390 nm
Reflection Coefficient, Visible (0-1)	0.92 @Wavelength 587.6 nm	0.92 @Wavelength 587.6 nm	Reflection Factor P

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CSGT57 / 2046

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