Optical gel is 2-part epoxy
NSN 5999-01-259-2031
NSN 6135-01-328-0639
NSN 6645-00-795-5565
NSN 5930-01-386-6417
NSN 5910-00-687-1254
NSN 6130-01-017-5448
NSN 5996-01-650-5762
NSN 6220-01-607-7316
NSN 5935-01-418-1014
NSN 5925-01-477-8316
NSN 6105-01-066-9594
NSN 5998-01-605-3467