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ASTM C912-93(2013)

Historical Reaffirmation

Standard Practice for Designing a Process for Cleaning Technical Glasses

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1.1 This practice covers information that will permit design of a rational cleaning procedure that can be used with a glass that is somewhat soluble in many aqueous chemical solutions. Typically, this type of glass is used in applications such as optical ware, glass-to-metal seals, low dielectric loss products, glass fibers, infrared transmitting products, and products resistant to metallic vapors.

1.2 In most cases, this type of glass contains high concentrations of oxides that tend to react with a number of aqueous chemicals. Such oxides include B2O3, Al2O3, R2O, RO, La2O3, ZnO, PbO, P2O5, and Fe2O3. The more conventional high-silica glasses are usually more chemically resistant, but the cleaning principles outlined here also apply to them.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 4 and Table 1.


3.1 Many of the low-silica technical glasses which contain soluble or reactive oxides require processing or involve applications that require cleaning. Very often these cleaning procedures have evolved over several decades and are considered an art. They usually contain numerous steps, some of questionable validity. It is the premise of this practice that cleaning glass can be more scientific. Design of a cleaning procedure should involve (1) a definition of the soil to be removed, (2) an awareness of the constraints imposed by the glass composition, and (3) a rational selection of alternative methods that will remove the soil and leave the glass in a condition suitable for its intended application. This practice provides information to assist in step (3). General references on glass cleaning and on various methods of evaluating cleanliness and associated information has been published.2

SDO ASTM: ASTM International
Document Number C912
Publication Date Oct. 1, 2013
Language en - English
Page Count 7
Revision Level 93(2013)
Supercedes
Committee C14.02
Publish Date Document Id Type View
Nov. 1, 2017 C0912-17 Revision
Sept. 1, 2008 C0912-93R08E01 Revision
July 1, 2022 C0912-17R22 Reaffirmation
Oct. 1, 2013 C0912-93R13 Reaffirmation
Sept. 1, 2008 C0912-93R08 Reaffirmation
Oct. 1, 2003 C0912-93R03 Reaffirmation
Jan. 1, 1997 C0912-93R97 Reaffirmation