Loctite Stycast OS 5101 dual-cure adhesive is for optical lens and component alignment during inline assembly.

Maintains dimensional stability to ensure lens position while in operation. Coefficient of thermal expansion (CTE) below Tg of 20 PPM/°C; volume shrinkage <1%; moisture absorption of 0.8%; adheres to various substrates; high UPH capability with energy savings; first-phase UV cure achievable in 40 sec. using 1W UV.

Henkel Adhesives

https://www.henkel-adhesives.com/us/en/industries/electronics/industrial-and-infrastructure/telecom-datacom-infrastructure/optoelectronics.html