Infrared Transmitting Filters

Infrared-transmitting filters absorb most of the visible region and transmit the infrared region. They include the R and IR series, which sharply cut off part of the infrared, the RM series, which smoothly and gradually cut them off, and the RT series which band-pass the infrared region.

They are widely used in light sources for such purposes as infrared warning systems and night-vision equipment.

Item / Filter Type	Standard Value			Color Specification (Standard illuminants A)		Thickness	Reflective Index	Chemical Properties		Thermal Properties				Mechanical Properties		Specific Gravity
Color Filter Glass : Infrared Transmitting Filter Data
print-friendly data table													definition of terms
Item / Filter Type	λ_T (nm)	Δ_λ (nm)	T_H (%)	x	y	mm	n_d	D_w	D_A	T_g	T_S	α -30/70	α 100/300	H_K	F_A	S
R-70	700±10	<45	>85	-	-	2.5	-	1	3	525	575	98	115	470	160	2.86
R-72	720±10	<45	>85	-	-	2.5	-	1	3	525	575	100	116	470	160	2.86
IR-76	760±10	<60	-	-	-	2.5	-	1	2	495	545	89	99	500	160	2.84
IR-80	800±10	<60	-	-	-	2.5	-	1	3	495	550	87	100	500	160	2.85
IR-83	830±10	<60	-	-	-	2.5	-	2	4	500	555	99	109	500	160	2.99
IR-85	850±10	<60	-	-	-	2.5	-	1	4	490	535	92	102	500	150	3.02

Item / Filter Type	Standard Value			Color Specification (Standard illuminants A)		Thickness	Reflective Index	Chemical Properties		Thermal Properties				Mechanical Properties		Specific Gravity
Item / Filter Type	λ₅ (nm)	λ₈₀ (nm)		x	y	mm	n_d	D_w	D_A	T_g	T_S	α -30/70	α 100/300	H_K	F_A	S
RM-90	770	1050		-	-	2.5	-	3	3	440	490	107	125	450	170	3.15
RM-100	850	1200		-	-	2.5	-	3	4	450	490	98	115	460	180	3.23

Item / Filter Type	Standard Value			Color Specification (Standard illuminants A)		Thickness	Reflective Index	Chemical Properties		Thermal Properties				Mechanical Properties		Specific Gravity
Item / Filter Type	T₈₃₀ (%)	T₇₀₀ (%)	T₁₂₀₀ (%)	x	y	mm	n_d	D_w	D_A	T_g	T_S	α -30/70	α 100/300	H_K	F_A	S
RT-830	82±5	<5	<1.0	-	-	2.5	-	1	1	545	605	91	101	510	140	2.75
print-friendly data table

λ_T(nm):	Transition Wavelength. It is defined as the wavelength at the mid-point of the transition interval.
Δ_λ(nm):	Transition Interval. It is defined as the mean distance between the point of 72% transmittance and the point of 5% transmittance.
T_H(%):	Average High Transmittance. It is expressed by the average transmittance for the high transmittance range which extends from the high transmittance limit wavelength to 800nm.
λ₅ (nm)	Wavelength for less than 5% transmittance
λ₈₀ (nm)	Wavelength for over 80% transmittance

Note: The listed data are standard value. Because of continuous product improvement, the various data listed are subject to change without notice.