This standard is issued under the fixed designation E ; the number I This test method is under the jurisdiction of ASTM Committee E-2 I on Space. E Standard Test Method for Total Mass Loss and Collected Volatile Condensable Standard + Redline PDF Bundle ASTM License Agreement. ASTM E Test Method. NuSil Technology LLC. Carpinteria, CA. +1 () +1 () Fax [email protected]
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ASTM E Outgassing noititsojunchawk.tk - Download as PDF File .pdf), Text File .txt) or read online. Outgassing Data (ASTM Specification E). Nelco Material. Total Mass Loss. TML (1% max). Collected Volatiles. Condensable Material. CVCM (% max). in accordance with ASTM E Materials and Processes Laboratory. Materials Test Branch, Building National Aeronautics and.
These include polymer potting compounds, foams, elastomers, films, astk, insulations, shrink tubings, adhesives, coatings, fabrics, tie cords, eurocode 3 pdf and lubricants. RadTech announces new conference. Link to Active This link will always route to the current Active version of the standard.
Please first verify your email before subscribing to alerts. Many types of organic, polymeric, and inorganic materials can be tested. This standard is also available to e included in Standards Subscriptions. Condensation from this process can collect on sensors, electronics and xstm equipment, causing damage to mission-critical equipment. Your Alert Profile lists the documents that will be monitored.
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We have no amendments or corrections for this standard. Asuperscript epsilon indicates an editorial change since the last revision or reapproval. The overall mass loss can be classifiedinto noncondensables and condensables.
These devices are manufactured or used in ashm vacuum environments so even the slightest amount of outgas can be detrimental to their performance. An additional parameter, the amount astm e water vapor regained W Samples tested at other temperatures astm e be compared only with other materials which were tested at that same temperature.
In low-Earth orbits, where space stations and most artificial satellites are deployed, there is highly reactive atomic oxygen AO. Higher up, in geostationary orbits where communications and weather satellites operate, particulate radiation protons, electrons, and heavy ions can cause problems.
And in interplanetary regions and deep space where space probes travel, high temperatures and intense radiation are of particular concern. Problems with adhesives in space Adhesives and other polymers are used extensively in all types of spacecraft for structural, mechanical, and electronics purposes — including bonding, potting, encapsulating, coating, sealing, and staking. Most adhesives used on spacecraft are not exposed to atomic oxygen or ionizing radiation because they are inside or sandwiched and protected between parts they are holding together.
But whether directly exposed to space or not, most adhesives employed in space applications are subject to high vacuum and extreme cold. They must function properly despite the surrounding conditions without degrading other spacecraft components.
Optics for space applications can be protected by using low-outgassing adhesives. Otherwise, contaminants put off by the adhesive can fog and degrade the lenses.
Adhesives on spacecraft are often near electronic or optical devices, where contamination can lead to serious problems. For example, many adhesives outgas, potentially releasing volatile products which condense and contaminate electronic, optical, and other precision instruments.
Outgassed compounds can cloud or fog optical and electro-optical components and interfere with circuit continuity. Even tiny amounts of condensed organic material can alter the reflectivity or absorbency of optical components. Precise control over outgassing levels is critical in preventing contaminant deposits and the resulting loss of performance to mission-critical subsystems.
Requirements for adhesives Adhesives for space applications must function in high vacuums, extremely low temperatures, and withstand temperature fluctuations. Their bonds should also last the length of the mission. Adhesives directly exposed to space for long periods of time should also strongly resist radiation and microcracking and, if in a low-Earth orbit, also resist atomic oxygen.
And lengthy exposure to AO can erode adhesives. Low-outgassing epoxies are used for structural, mechanical, electronic, and adhesive applications on spacecraft and satellites.
Other application-specific requirements include electrical conductivity, optical clarity, thermal conductivity or insulation, low ionic content, and cryogenic serviceability.
An addendum states that the total mass lost may exceed 1. The equipment should be calibrated at least inert gas. The specimen and the collector plates are weighed.
Normally, the reported values long as the configuration shown in Fig. The dimensions for critical com- ponents given in Fig. Sodium chloride flats may be used for infka.
These flats are provide uniform and comparable results. Signifkance and Use receptacle. On completion of the test, the flats are placed into an infrared salt flat holder for examination by an infmed 5. Apparatus 6. Generally, each bar is mm See Figs.
Variations in test apparatus configurations are acceptableif critical dimensions are maintained as prescribed in Table 1. The test apparatus can be mounted on the base plate of a vacuum system within a massof those products that leavethe specimenand condense narrow vacuum bell, mm 10Ydin. Samples tested at other temperatures may any device for raising the vacuum bell can be automatically be compared only with other materials which were tested at controlled.
Power to the heating element mounted in the that same temperature. Recorders with an elec- able material are also comparable and valid only for similar tronic icepoint referencejunction feedback may be used to collectorgeometry and surfacesat 25eC. Samples have been monitor the heater bar temperatures. Data taken at non-standard conditions must be 6.