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Low Softening Temperature Optical Glasses

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

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

Type Code nd vd Tg (deg C) At (deg C) RW(P) RA(P) S.G.
L-BSL7 516641 1.51633 64.1 498 549 2 1 2.38
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-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-TIM28 689311 1.68893 31.1 504 539 2 1 2.88
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-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-NBH54 902251 1.90200 25.1 547 586 1 1 3.64