Get ECSS-Q-70-02A Space Product Assurance - Thermal Vacuum Outgassing Test For The Screening Of Space

The outgassing criteria are based upon the micro-VCM test (ECSS-Q-70-02), and shall take into account the location of the outgassing source and its mass. GENERAL REQUIREMENT FOR OUTGASSING: The general requirement for materials outgassing is RML<1.0% and CVCM < 0.1 % as per ECSS-Q-70.

The TML is obtained by measuring the weight of the sample before and after the test and then subtracting the final weight from the initial weight.

Calculation of the outgassing rate Calculate the outgassing rate, q (H2 equivalent), using the equation q = (V/A) (dP/dt) [Pa m3 sec−1 m−2], where V is the volume of the sample chamber (m3) and A is the geometrical surface area of the chamber (m2).

To meet NASA Outgassing requirements, TML must be less than 1% and the CVCM must be less than 0.1%. Both requirements must be met to be considered a NASA Low Outgassing material.

A NASA-developed test standard, ASTM E595- 77/84/90, is used to determine how much volatile content is contained in material sample; for a product to be qualified for space flight, it must pass this test standard.

The industry standard test for measuring outgassing in adhesives and other materials is ASTM E595. Developed by NASA to screen low outgassing materials for use in space, the test determines the volatile content of material samples placed in a heated vacuum chamber.

Definition. total mass loss of material outgassed from a specimen that is maintained at a specific constant temperature and operating pressure for a specified time.

The outgassing criteria are based upon the micro-VCM test (ECSS-Q-70-02), and shall take into account the location of the outgassing source and its mass. GENERAL REQUIREMENT FOR OUTGASSING: The general requirement for materials outgassing is RML<1.0% and CVCM < 0.1 % as per ECSS-Q-70.

The TML is obtained by measuring the weight of the sample before and after the test and then subtracting the final weight from the initial weight.

The industry standard test for measuring outgassing in adhesives and other materials is ASTM E595. Developed by NASA to screen low outgassing materials for use in space, the test determines the volatile content of material samples placed in a heated vacuum chamber.

Calculation of the outgassing rate Calculate the outgassing rate, q (H2 equivalent), using the equation q = (V/A) (dP/dt) [Pa m3 sec−1 m−2], where V is the volume of the sample chamber (m3) and A is the geometrical surface area of the chamber (m2).

RML (Recovered Mass Loss): The percentage of mass loss in a sample material after exactly 24 hours in a high vacuum at a temperature of 125 °C, and a post-conditioning of 24 hours at 55 % rH and 22 °C.

To meet NASA Outgassing requirements, TML must be less than 1% and the CVCM must be less than 0.1%. Both requirements must be met to be considered a NASA Low Outgassing material.

Test Method ASTM E595 The sample is weighed and placed into an individual compartment within the test stand. It is then heated to 125°C at less than 5 x 10-5 torr for 24 hours. Any volatile components of the sample will be outgassed during this step.

A NASA-developed test standard, ASTM E595- 77/84/90, is used to determine how much volatile content is contained in material sample; for a product to be qualified for space flight, it must pass this test standard.

RML : Recovered Mass Loss is the difference between initial mass and mass after re-conditioning (shows the amount of non-water products) TML :Total Mass Loss is the difference of mass directly before and after vacuum test (shows the amount of all outgassing products as percentage of initial mass)

The industry standard test for measuring outgassing in adhesives and other materials is ASTM E595. Developed by NASA to screen low outgassing materials for use in space, the test determines the volatile content of material samples placed in a heated vacuum chamber.

Definition. total mass loss of material outgassed from a specimen that is maintained at a specific constant temperature and operating pressure for a specified time.

The industry standard test for measuring outgassing in adhesives and other materials is ASTM E595. Developed by NASA to screen low outgassing materials for use in space, the test determines the volatile content of material samples placed in a heated vacuum chamber.

RML (Recovered Mass Loss): The percentage of mass loss in a sample material after exactly 24 hours in a high vacuum at a temperature of 125 °C, and a post-conditioning of 24 hours at 55 % rH and 22 °C.

Test Method ASTM E595 The sample is weighed and placed into an individual compartment within the test stand. It is then heated to 125°C at less than 5 x 10-5 torr for 24 hours. Any volatile components of the sample will be outgassed during this step.

RML : Recovered Mass Loss is the difference between initial mass and mass after re-conditioning (shows the amount of non-water products) TML :Total Mass Loss is the difference of mass directly before and after vacuum test (shows the amount of all outgassing products as percentage of initial mass)