What are fieldron and detonite injectors used for?

[Nijuu]

Seems to crop up often on invasion rewards....

[dj8472]

Building weapons researched in the clan labs
Fieldrons for corpus weapons, Detonite injectors for grineer weapons and Mutagen mass for infested weapons
https://warframe.fandom.com/wiki/Research

[Dai]

They are needed for clan research projects or crafting various clantech items (after you get their blueprints)

[Watermelons]

The majority of equipment offered in clan dojo labs. Fieldrons are used for things in the Energy Lab, Detonite Injectors for things in the Chemical Lab, and Mutagen Masses for things in the Bio Lab.
Fieldron, Detonite Injector, and Mutagen Mass blueprints are also found in their respective lab, using the smaller Fieldron Samples, Detonite Ampules, and Mutagen Samples to build them.

[Zukabazuka]

If you are a new player you should stockpile those because most weapons require around 5-10 per weapon.

[zueldebizz]

Yep,stockpile need.Cuz it takes a long time to make.