Polymer
Material · MaterialProccessing0★Refined oil worked into polymer at a Production Assembly Line; advanced gear like firearms depends on it.
Polymer feeds 59 different recipes, which is why it is worth farming past the point you think you need it.
Details
It weighs almost nothing and stacks to 9,999, so there is no reason not to carry a full stack.
Polymer Crafting Recipe
Crafting it takes 3 materials across 2 types, and the bottleneck is almost always the 2× requirement — line that up first and the rest follows.
Where to Find Polymer
Polymer is not something you find lying around — you craft it, and the recipe is below.
Using Polymer Well
The recipe is a Technology tree entry at level 33 and costs 2 ordinary technology points, so it is cheap to grab the moment you hit the level. Do it early: nearly every firearm on the tree is gated behind a Polymer count, and the material has no substitute.
The bottleneck is never the Sulfur, it is the two High Quality Pal Oil per unit. The fastest kill-for-oil target is Mammorest, which drops 5-10 High Quality Pal Oil every single time — one Mammorest is two to five Polymer's worth of oil. Eidrolon Ignis pays 5-6 and Relaxaurus 1-4, all at a guaranteed rate.
For hands-off supply, park a Dumud on a Ranch — Dumud produces High Quality Pal Oil passively, so a base with a few of them turns Polymer into a queue-and-forget craft instead of a hunting trip.
If you would rather pay than farm, every merchant that stocks High Quality Pal Oil sells it at a flat 300 Gold — Wandering Merchants, the desert and volcano settlement traders, and the caravan all use the same price. That puts a bought-out Polymer at 600 Gold of oil plus one Sulfur, which is worth it when you are one weapon short of a boss run.
The PIDF Illegal Factory expedition returns 10-20 High Quality Pal Oil per run at a guaranteed rate. It is a Very Hard, two-hour posting, so send a squad out overnight and you come back to enough oil for five to ten Polymer without touching the bench.
Alternatives and Upgrades
Other crafting materials at a similar tier, for when you want to weigh this against the rest of its class: