ASTM E595 is a test of the degassing performance of materials used in special places such as aerospace and 5G. Any small venting or leakage of the spacecraft will create an additional acceleration.Changing the orbit and attitude of the spacecraft to comply with ASTM E595 can reduce the impact on sensitive environments.

With the rapid development of aerospace and 5G applications, the special space environment has put forward particularly strict requirements on the release characteristics of electronic components (air).Outgassing of materials and structures is a very common phenomenon in the vacuum environment of space, which has a great impact on the normal and stable operation of spacecraft and 5G station.ASTM E595 is one of the commonly used vent standards for evaluating molecular contamination.

ASTM E595-15 Outgassing test - Test Standard

ASTM E595 Standard Test Method for Total Mass Loss and Collected Volatile Condensable Materials from Outgassing in a Vacuum Environment

ASTM E595-15 Outgassing test - Test Requirement

CVCM （collected volatile condensable materials）≤0.1%

TML （total mass loss）≤1%

WVR （the amount of water vapor regained）

Outgassing test ASTM E595 - Test Conditions

Pre Condition: 73 F/ 50% RH (24Hours)  ; Post Condition: 73 F/ 50% RH (24Hours)

This test method describes the test apparatus and related operating procedures for evaluating the mass loss of materials being subjected to 125°C at less than 7*10⁻³ Pa  for 24 h. The overall mass loss can be classified into noncondensables and condensables. The latter are characterized herein as being capable of condensing on a collector at a temperature of 25°C.

ASTM E595-15 Outgassing test – Brief

Many types of organic, polymeric, and inorganic materials can be tested. These include polymer potting compounds,foams, elastomers, films, tapes, insulations, shrink tubings,

adhesives, coatings, fabrics, tie cords, and lubricants. The materials may be tested in the “as-received” condition or prepared for test by various curing specifications.

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From JJ2022