Standard Historical Last Updated: Dec 31, 2010 Track Document
ASTM C912-93(2003)

Standard Practice for Designing a Process for Cleaning Technical Glasses

Standard Practice for Designing a Process for Cleaning Technical Glasses C0912-93R03 ASTM|C0912-93R03|en-US Standard Practice for Designing a Process for Cleaning Technical Glasses Standard new BOS Vol. 15.02 Committee C14
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Significance and Use

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

Scope

1.1 This practice is intended to provide 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 B2 O3 , Al2 O3 , R2 , RO, La2 O3 , ZnO, PbO, P2 O5 , and Fe2 O3 . 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.

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Details
Book of Standards Volume: 15.02
Developed by Subcommittee: C14.02
Pages: 6
DOI: 10.1520/C0912-93R03
ICS Code: 81.040.01