Reduced Organic Outgassing in the NASA Osiris-Rex and Hayabusa2 Curation Facility by Careful Selection and Implementation of Cleanroom Construction Materials

In October 2021, NASA Johnson Space Center (JSC) Astromaterials Acquisition and Cu-ration Office in JSC bldg. 31 completed construction and commissioning of the OSIRIS-REx and Hayabusa2cleanroom laboratory suites along with new precision cleaning and advanced curation laboratories: •OSIRIS-REx Curation Cleanroom: ISO Class 5•Hayabusa2 Curation Cleanroom: ISO Class 5•Final Precision Cleaning Cleanroom: ISO Class 5•Advanced Precision Cleaning Cleanroom: ISO Class 6•PreClean Precision Cleaning Cleanroom: ISO Class 6•Advanced Curation Cleanroom: ISO Class 7The new curation facilities are designed for initial receiving, basic characterization, curation processing, and preliminary examination of carbonaceous asteroidal material. The facilities are also designed to enable long-term pristine sample storage to preserve the scientific integrity of each sample to enable decades of future re-search by the international science community. The scientific study of organics in general is critical for both missions. The OSIRIS-REx mission executed a stringent contamination control plan [1] where all sample hardware at time of sample acquisition would be at Level 100 A/2 per IEST-STD-CC1246D (non-volatile residue (NVR) < 500 ng/cm2). In addition, the mission imposed a requirement of <180 ng/cm2 for amino acids (and hydrazine) [1]. Given these mission requirements, long-term storage preservation requirements, and information from the Organic Contamination Baseline Study at JSC [2], the JSC Curation team decided to carefully select cleanroom construction materials that would not hinder the scientific search for amino acids and the study of organics in the samples [3].