Home

Low Softening Temperature Optical Glass

Ohara's Low Softening Temperature Optical Glasses are a series of glasses that have been developed to be molded at lower temperatures than our conventional optical glasses, while maintaining the same general optical properties (refractive indices, dispersions, etc.). These glasses are environmentally safe as they do not contain PbO and As2O3 in their composition and they allow for a simplified waste stream disposal.

The Low Softening Temperature Optical Glasses are used for Ohara's Fine Gobs for molding operations and help to extend the life of the mold pressing tools by minimizing the reaction between the softened glass and the mold materials. The Low Softening Temperature Optical Glasses types are available in strip form, blanks or Fine Gobs.

Information Sheet for Low Tg / Fine Gob glass types

Ohara L-Type Glass Catalog Data (Excel Format)

The table below shows the optical properties of our key Low Softening Temperature Optical Glasses.

Type	Code	n_d	v_d	Tg (deg C)	At (deg C)	RW(P)	RA(P)	S.G.
L-BAL35	589612	1.58913	61.2	527	567	2	4	2.82
L-BAL42	583594	1.58313	59.4	506	538	2	4	3.05
L-BSL7	516641	1.51633	64.1	498	549	2	1	2.38
L-LAH53	806409	1.80610	40.9	574	607	1	4	4.49
L-LAH81	806404	1.80610	40.4	566	602	1	3	4.53
L-LAH83	864406	1.86400	40.6	608	658	1	2	5.29
L-LAH84	809404	1.80860	40.4	527	568	1	3	4.62
L-LAH85	854404	1.85400	40.4	614	659	1	2	5.09
L-LAH86	903310	1.90270	31.0	578	610	1	3	4.90
L-LAH87	770474	1.77030	47.4	548	597	1	4	4.34
L-LAL12	678549	1.67990	54.9	562	600	1	4	3.48
L-LAL13	694532	1.69350	53.2	534	575	1	4	3.69
L-LAM60	743493	1.74320	49.3	541	581	1	4	4.2
L-LAM69	731405	1.73077	40.5	497	529	1	3	3.24
L-LAM72	733489	1.73310	48.9	565	608	1	4	3.89
L-NBH54	902251	1.90200	25.1	547	586	1	1	3.64
L-PHL1	565608	1.56455	60.8	347	379	1	5	3.18
L-PHL2	559625	1.55880	62.5	381	407	1	5	3.03
L-TIH53	847238	1.83648	23.8	561	598	1	1	3.34
L-TIM28	689311	1.68893	31.1	504	539	2	1	2.88

Optical Glass