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Description of ASTM-E2311 2009ASTM E2311 - 04(2009)Standard Practice for QCM Measurement of Spacecraft Molecular Contamination in SpaceActive Standard ASTM E2311 | Developed by Subcommittee: E21.05 Book of Standards Volume: 15.03 ASTM E2311Significance and Use Spacecraft have consistently had the problem of contamination of thermal control surfaces from line-of-sight warm surfaces on the vehicle, outgassing of materials and subsequent condensation on critical surfaces, such as solar arrays, moving mechanical assemblies, cryogenic insulation schemes, and electrical contacts, control jet effects, and other forms of expelling molecules in a vapor stream. To this has been added the need to protect optical components, either at ambient or cryogenic temperatures, from the minutest deposition of contaminants because of their absorptance, reflectance or scattering characteristics. Much progress has been accomplished in this area, such as the careful testing of each material for outgassing characteristics before the material is used on the spacecraft (following Test Methods E595 and E1559 ), but measurement and control of critical surfaces during spaceflight still can aid in the determination of location and behavior of outgassing materials. 1. Scope 1.1 This practice provides guidance for making decisions concerning the use of a quartz crystal microbalance (QCM) and a thermoelectrically cooled quartz crystal microbalance (TQCM) in space where contamination problems on spacecraft are likely to exist. Careful adherence to this document should ensure adequate measurement of condensation of molecular constituents that are commonly termed contamination on spacecraft surfaces. 1.2 A corollary purpose is to provide choices among the flight-qualified QCMs now existing to meet specific needs. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 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.
ASTM Standards E595 Test Method for Total Mass Loss and Collected Volatile Condensable Materials from Outgassing in a Vacuum Environment E1559 Test Method for Contamination Outgassing Characteristics of Spacecraft Materials U.S. Federal Standards FED-STD-209E Airborne Particulate Cleanliness Classes in Cleanrooms and Clean ZonesISO Standards ISO14644-2 Cleanrooms and Associated Controlled Environments--Part 2: Specifications for Testing and Monitoring to Prove Continued Compliance with ISO 14644-1Keywords contamination measurement; molecular contamination; outgassing; outgassing rates; quartz crystal microbalance; spacecraft contamination; temperature controlled quartz crystal microbalance; Molecular contaminant; Quartz crystal microbalances (QCM); ICS Code ICS Number Code 71.040.99 (Other standards related to analytical chemistry) DOI: 10.1520/E2311-04R09 ASTM International is a member of CrossRef. ASTM E2311This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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