ASTM E595 PDF

A number in parentheses indicates the year of last reapproval. A superscript epsilon f indicates an editorial change since the last revision or reapproval. This test method has been approved for use by agencies of the Department of Defense. Scope 1. It is the responsibility determine volatile content of materials when exposed to a of the user of this standard to establish appropriate safety and vacuum environment.

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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. The overall mass loss can be classifiedinto noncondensables and condensables. These include polymer potting compounds,foams, elastomers, films, tapes, insulations, shrink tubings,adhesives, coatings, fabrics, tie cords, and lubricants.

Historically,TML of 1. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.

Referenced Documents2. CVCM is expressed as apercentage of the initial specimen mass and is calculated fromthe condensate mass determined from the difference in mass ofthe collector plate before and after the test. TML is calculated from the mass of the specimen asmeasured before and after the test and is expressed as apercentage of the initial specimen mass.

Current edition approved May 1, Published July Originally approvedin Last previous edition approved in as E β€” DOI: United States WVR is expressed as a percentage ofthe initial specimen mass. Summary of Test Method4. After this exposure, the boat andspecimen are weighed and put in one of the specimen com-partments in a copper heating bar that is part of the testapparatus.

The copper heating bar can accommodate a numberof specimens for simultaneous testing. This causesvapor from the heated specimen to stream from the hole in thespecimen compartment. Each specimen compartment has a corresponding collectorchamber that is isolated from the others by a compartmentedseparator plate to prevent cross contamination. After 24 h, thetest apparatus is cooled and the vacuum chamber is repressur-ized with a dry, inert gas.

The specimen and the collector platesare weighed. Normally, the reportedvalues are an average of the percentages obtained from threesamples of the same material. NOTE 2β€”It is also possible to conduct infrared and other analytical testson the condensates in conjunction with mass-loss tests. Sodium chlorideflats may be used for infrared analysis. These flats are nominally 24 mm 1 in. On completionof the test, the flats are placed into an infrared salt flat holder forexamination by an infrared spectrophotometer.

As an alternative method,the condensate may be dissolved from the metallic collector, the solventevaporated, and the residue deposited on a salt flat for infrared tests.

Sodium chloride flats shall not be used for CVCM determinations. The specimen mass after thisexposure is determined. From these results and the specimenmass determined after vacuum exposure, the percentage WVRis obtained. Three specimen compart-ments can serve as controls and three can be used for each typeof material being tested. The total time required for specimensrequiring no prior preparation is approximately 4 days.

Theequipment should be calibrated at least once a year by usingpreviously tested materials as test specimens. The referencesample should be selected from materials that had a narrowrange of TML and VCM results when tested originally.

The dimensions for critical components given inFig. Significance and Use5. Samples tested at other temperatures may be comparedonly with other materials which were tested at that sametemperature. It is sufficient that the pressure be low enough thatthe mean free path of gas molecules be long in comparison tochamber dimensions.

The user may designate addi-tional tests to qualify materials for a specific application. The vials must be capped before removal from the conditioningchamber. Each specimen must be weighed within 2 min afteropening the vial to minimize the loss or absorption of watervapor while exposed to an uncontrolled humidity environment.

Generally, each bar is mm See Figs. Variations in test apparatusconfigurations are acceptable if critical dimensions are main-tained as prescribed in Table 1. Power to the heating element mounted in the copperbars is generally controlled by variable transformers throughtemperature controllers.

Recorders with an electronic icepointreference junction feedback may be used to monitor the heaterbar temperatures. Care must be taken to prevent backstreamingof oil from vacuum or diffusion pumps into the vacuumchamber. Tolerance NotesAA6.

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This test is performed using a high vacuum test rig. The purpose of the test is to determine the amount of volatile content in a material when exposed to heat and vacuum in a closed system. After this conditioning, the samples are re-weighed and put into one of the testing cells. The typical test can run up to two different materials at a time. After all the samples are weighed and loaded into the chamber, it is then evacuated to a vacuum level of at least 7 x Pascals or 5 x torr. Each sample compartment has a corresponding collector chamber that is isolated from the others to prevent cross contamination. After 24 hours, the test apparatus is cooled and the vacuum chamber is re-pressurized with a dry, inert gas.

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ASTM E-595 Outgassing Test.pdf

The vials e55 be capped before removal from the conditioning chamber. By using our website you consent to all cookies in accordance with our Cookie Policy. Our deliverable is certainty β€” high quality data, test reports and certificates that you can absolutely rely on when making decisions about your materials and compliance. Ready to request a quote? In medical environments such as hospitals, AMCs can contaminate sterile surfaces. Condensation from this process can collect on sensors, electronics and navigational equipment, causing damage to mission-critical equipment. ASTM E f testing procedures for evaluating changes in material mass caused by outgassing in high-vacuum environments.

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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. The overall mass loss can be classifiedinto noncondensables and condensables. These include polymer potting compounds,foams, elastomers, films, tapes, insulations, shrink tubings,adhesives, coatings, fabrics, tie cords, and lubricants. Historically,TML of 1. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.

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More E Samples tested at other temperatures may be compared only with other materials which were tested at that same temperature. It is sufficient that the pressure be low enough that the mean free path of gas molecules be long in comparison to chamber dimensions. The user may designate additional tests to qualify materials for a specific application. The vials must be capped before removal from the conditioning chamber.

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