Chemical Resistance of Glass Material

(February 1, 1999)


ULE | borosilicate Ohara E6 | Zerodur | Pyrex | Cer-Vit


ULE

solution@95 C

duration of test (hr)

weight loss (mg/cm3)

5% HCl

24

< 0.01

5% NaOH

6

1.2

.02N Na2CO3

6

0.17

5% H2SO4

24

< 0.01

H2O

24

< 0.01

contact: Mary Edwards (June 15, 1998, updated from ULE catalog)

Corning Inc.
Canton Plant
334 County Route 16
Canton, NY 13617
tel 315-379-3200

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Ohara E6 Borosilicate

(V. Zitelli 1997, C&C, e-mail Jan 29/99)

Experiment for LBT(Large Binocular Telescope, 8.4 m x 2)

Chemical bath in one month, surface roughness measured by Wyko interferometer.

group 1

group 1

roughness (nm)

rms (nm)

initial condition

0.92

0.16

HNO3 (32%)

0.83

0.05

HCl (18%)

1.21

0.23

KOH (5%?)

3.44

0.06

NaOH (20%)

5.82

0.82

group 2

roughness (nm)

rms (nm)

initial condition

0.52

0.06

HNO3 (32%)

0.52

0.06

HCl (18%)

0.50

0.04

KOH (5%?)

0.44

0.07

NaOH (20%)

1.86

0.15

Concluded as "bases are likely to produce microdamages on borosilicate" (http://boas5.bo.astro.it/~zitelli/hawaii/paper/paper2.html)

Valentina Zitelli, zitelli@astbo3.bo.astro.it

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