Adhesives

3M 2216 A/B Gray is often baselined for space applications as it is, readily available, and well characterized adhesive over temperature [1] and low outgassing:

sample_id	data_ref	mfgr_code	tml	vcm	wvr	time1	temp1	atm1	time2	temp2	atm2	time3	temp3	atm3	time4	temp4	atm4	appl_code
SCOTCHWELD 2216	A/B GRAY	GSC35727	MMM	0.99	0.02	0.21	7D	25	AIR									EPOXY

When more compliance is required, RTV-566 is a standard adhesive for space systems, e.g. [2]

[1]

Sundvold, P. D. (1996). Optical Adhesive Property Study (No. KCP–613-5631). Allied-Signal Aerospace Co., Kansas City, MO (United States)

[2]

Mower, T. M. (2018). Thermomechanical behavior of aerospace-grade RTV (silicone adhesive). International Journal of Adhesion and Adhesives, 87, 64–72.