Thursday, 15 November 2012

Characteristics of Some Glasses

This information has been taken from various sources. Some manufacturers may change the composition of their glasses or the published information about them from time to time. Therefore, this information can only be used as a guide. If the information about strain, annealing, and softening points is important, contact the manufacturer for the most accurate information.

The temperature information is given in Celsius.
Strain point – the temperature below which no annealing can be done.
Annealing point – the temperature at which the equalisation soak should be done before the annealing cool.
Softening point – the temperature at which slumping can most quickly occur.


Armstrong – Now made by Kokomo

Typical Borosilicate – nominal CoE 32
Strain point – 510 - 535
Annealing point – ca. 560
Softening point - ca. 820

Blackwood OZ Lead – nominal CoE 92
Annealing point - 440

Blenko – nominal CoE 110
Annealing point – 495

Bullseye – nominal CoE 90

Transparents
Strain point - 493
Annealing point - 532 Note that Bullseye has changed this to 482 for thick items
Softening point - 677

Opalescents
Strain point - 463
Annealing point – 501 Note that Bullseye has changed this to 482 for thick items
Softening point - 688

Gold Bearing
Strain point - 438
Annealing point - 472 Note that Bullseye has changed this to 482 for thick items
Softening point - 638

Chicago – nominal CoE 92

Desag  Note that this glass is no longer produced
Artista – nominal CoE 94
Strain point – 480 - 510
Annealing point – 515 - 535
Softening point – 705 – 735
Fusing range – 805 – 835

Float Glass (typical for USA) nominal CoE 83
Strain point - 511
Annealing point - 548
Softening point – 715

Float Glass (typical for Australia) nominal CoE 84
Strain point - 505-525
Annealing point – 540 -560

HiGlass “GIN” range – nominal CoE 90
Annealing point - 535

Gaffer colour rod – nominal CoE 88

Gaffer NZ Lead – nominal CoE 92
Annealing point - 440

HiGlass
Annealing point - 495

Kokomo – nominal CoE 92 - 94

Cathedrals
Strain point - 467
Annealing point - 507
Softening point - ca. 565

Opal Dense
Strain point - 445
Annealing point - 477
Softening point – ca. 565

Opal Medium
Strain point - 455
Annealing point - 490
Softening point – ca.565

Opal Medium Light
Strain point - 461
Annealing point - 499
Softening point – ca.565

Opal Light
Strain point - 464
Annealing point - 502
Softening point – ca.565

Kugler – nominal CoE
Annealing point - 470

Typical lead glass – nominal CoE 91

Lenox Lead – nominal CoE 94
Annealing point – 440

Merry Go Round – nominal CoE 92

Moretti/Effetre – nominal CoE 104
Strain Point: 448C
Annealing Range: 493 – 498C

Softening Point: 565C

Pemco Pb83 – nominal CoE 108
Annealing point – 415

Schott Borosilicate (8330) nominal CoE 32
Annealing point - 530

Schott “F2” Lead – nominal CoE 92
Annealing point - 440

Schott “H” & “R6” rods - nominal CoE 90
Annealing point – 530

Schott “W” colour rod – nominal CoE 98

St Just
MNA
Strain point - ca.450
Annealing point – ca. 532

Spectrum
System 96 – nominal CoE 96
Transparents
Strain point – 476 +/- 6
Annealing point – 513 +/- 6
Softening point – 680 +/- 6
Opalescents
Annealing point – 505 -515

Spruce Pine 87 – nominal CoE 96
Annealing point – 480

Uroboros system 96 – nominal CoE 96

Transparents
Strain point - 481
Annealing point - 517

Opalescents
Strain point - 457
Annealing point - 501

Uroboros - nominal CoE 90

Transparents
Strain point - 488
Annealing point - 525

Opalescents
Strain point - 468
Annealing point - 512

Wasser - nominal CoE 89
Annealing point – 490

Wissmach
Wissmach 90
Annealing point - 510
Softening point - 688
Full Fuse - 777+

Wissmach 96
Annealing point - 510
Softening point - 688

Full Fuse - 777+