What is NASA outgassing?
Many aerospace and spacecraft applications use a standard known as NASA outgassingo screen materials for use. Outgassingis the release of a gas that was dissolved, trapped, frozen or absorbed in some material. Outgassing products can condense onto optical elements, thermal radiators, or solar cells and obscure them. Many polymer materials go through rigorous testing to see it passes NASA Outgassing Standards. This test method covers a screening technique todetermine volatile content of materials when exposed to avacuum environment. Two parameters are measured: totalmass loss (TML) and collected volatile condensable materials(CVCM). An additional parameter, the amount of watervapor regained (WVR), can also be obtained after completion of exposures and measurements required for TML andCVCM. To meet NASA outgassing standards the TML cannot excel 1.0% and the CVCM cannot exceed 0.10%. Materials can have very different results depending on mix, cure, or changes in formulation over the years
EB-348 is a thixotropic, low expansion, high temperature adhesive. When cured properly (2hr/100°C + 2hr/190°C) EB-348 meets NASA Outgassing standards. It also has extremely low CTE of 23 in/in/°C. Its paste like rheology allows for application by syringe dispensing, screen printing, pin transfer, or manual application. EB-348 is used as a die attach adhesive to be used at temperatures exceeding 250°C.
|Mix Ratio by Weight||100/5|
|Mixed Viscosity @RT(cps)||300,000|
|Pot Life @25°C(100 gram)||2 hrs|
|Recommended Cure||2 hrs @ 100°C + 2hrs @ 175°C|
|Alternate Cure||1 hr @ 165°C|
|Lap Shear Strength @25°C(psi)||2000|
|Service Temp.Range||-55°C to 230°C|
|Volume Resistivity(500 V)||2 x 10^15|