OHARA INC. : S-NBH52, S-NBH53

S-NBH52, S-NBH53

| 365nm excitation fluorescence spectrum |

In comparison with general optical glasses, S-NBH52/S-NBH53 demonstrates unique characteristic in that the intensity of fluorescence from ultraviolet ray excitation is remarkably low. Therefore, the conventional problem of noise due to self fluorescence within an optical lens can be reduced. In addition, these glasses also provide abnormal dispersion and high transmittance, both of which are advantageous for lens design.

			S-NBH52	BPH35	S-NBH53	S-TIH3
Optical properties	Refractive Index n_d		1.67300	1.64450	1.73800	1.74000
	Abbe Number ν_d		38.2 38.15	40.8	32.3 32.26	28.3 28.30
	Coloring	λ80	360	380	385	420
	Coloring	λ5	320	320	335	360
	Anomalous dispersion θ g,F		0.5754	0.5687	0.5899	0.6079
Thermal Properties	CTE α (10^-7/°C)	-30～70°C	86	48	69	85
	CTE α (10^-7/°C)	+100～300°C	109	62	89	100
	Transformation Point Tg(°C)		520	485	578	615
	Yield Point At(°C)		556	519	620	644
Mechanical Properties	Specific Gravity		3.09	3.46	3.28	3.11
	Knoop Hardness Hk		590 [6]	470 [5]	600 [6]	560 [6]
	Abrasion Aa		123	111	114	165
Chemical Properties	Water Resistance RW(p) (Powder Method)		1	3	1	1
	Acid Resistance RA(p) (Powder Method)		1	5	1	1
	Weathering Resistance W(s) (Surface Method)		4	3	2	1
	Acid Resistance SR		1.0	52.1	1.0	1.0
	Phosphate Resistance PR		1.0	4.2	1.0	1.0
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