Table 2 Analyzed compositions as a function of time during production.

From: ISG-2: properties of the second International Simple Glass

Composition

Box #

Analyzed Glass Compositions (wt%)

Density (g ∙ cm-3)

Al2O3

B2O3*

CaO

La2O3

MgO

Na2O

SiO2

ZrO2

ISG-2

1

6.0

17.5

2.5

0.10

1.8

12.1

57.0

3.3

2.475

ISG-2

5

6.0

17.4

2.5

0.10

1.8

12.1

57.1

3.3

2.474

ISG-2

10

6.0

17.4

2.5

0.12

1.8

12.1

57.0

3.3

2.475

ISG-2

15

6.0

17.4

2.5

0.13

1.8

12.1

56.9

3.3

2.475

ISG-2

20

6.0

17.4

2.5

0.13

1.8

12.2

56.9

3.3

2.475

(ISG-1.75)

–

6.0

17.4

3.4

0.15

1.1

11.9

56.5

3.3

2.486

(ISG-1.50)

–

6.1

17.2

3.9

0.15

0.8

11.9

56.7

3.3

2.490

(ISG-1.25)

–

6.1

17.3

4.3

0.15

0.5

11.8

56.4

3.3

2.496

ISG-1

1

6.0

17.3

4.9

0.15

0.0

12.1

56.4

3.3

2.508

ISG-1

5

5.9

17.2

4.9

0.15

0.0

12.0

56.5

3.3

2.507

ISG-1

10

6.0

17.3

4.9

0.15

0.0

12.1

56.2

3.3

2.509

ISG-1

15

6.0

17.3

4.9

0.15

0.0

12.0

56.4

3.3

2.508

ISG-1

20

5.9

17.4

4.9

0.15

0.0

12.1

56.3

3.3

2.508

  1. This summary of analyzed compositions as a function of time highlights compositional consistency during production, particularly at the ISG-1 and ISG-2 endpoint compositions. Transition glasses shown with approximate decimal designations. All elements analyzed by XRF, except for B2O3, which was determined by ICP-OES.
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