Chemistry 16

Lore & Background

Factorio's chemistry progression is deliberately compact: four tiers that take the player from a single chemical plant and basic fluid pipes all the way to plastic bars, sulfuric acid, and the advanced processing that feeds the rocket fuel recipe. The design philosophy—visible in the game's own tech-tree layout—favours breadth over depth in any single column. Chemistry 4 is the ceiling, and beyond it the player's attention shifts toward logistics, military, and the final rocket assembly. Because the game has no 'Chemistry 5' through 'Chemistry 16,' any reference to such a tier is either a mod, a community joke, or an error. The Factorio community is rich with mods that extend the tech tree dramatically, and it is easy for a modded screenshot or a generated 'what-if' list to bleed into fan writing as though it were canon. This entry serves as a gentle correction: the factory you build in vanilla ends its chemistry story at tier four, and that is by design.

In Their Own Story

The engineer stared at the tech tree on the wall of the prefab, tracing the green lines from Chemistry 1 to Chemistry 4 with a calloused finger. Beyond the last node the wall was bare concrete. She had checked the mod list three times. There was no Chemistry 16. There had never been a Chemistry 16. She set down her coffee, smiled at the empty space where a sixteenth tier might have lived, and went back to balancing her plastic-bar production line. The factory hummed. It was enough.

Reader's Guide

There is no guide to write for a technology that does not exist. What you can do instead is review the actual chemistry line:

Chemistry 1 unlocks the chemical plant, fluid pipes, and the ability to process iron plates into iron rods and to produce basic fluids. Chemistry 2 adds the ability to produce plastic bars from petroleum and coal, and introduces the oil-refining pipeline. Chemistry 3 brings the ability to produce sulfuric acid and to process copper into copper cables at scale. Chemistry 4, the final tier, unlocks the production of rocket fuel from plastic bars and sulfuric acid, closing the loop needed for the space-age goal. If you are looking for a 'Chemistry 16' in a modpack or a community challenge, check the specific mod's documentation (for example, the 'K2 Chemistry' or 'Angels' mods extend fluid processing significantly). In vanilla, the line stops at four, and the game's design intends for you to spread your research budget across many columns rather than drilling a single one to an arbitrary depth. Blueprints, by contrast, are a real and powerful mechanic: press B, select an area, and the game serialises your construction into a shareable code. You can paste that code into a forum post, a Discord channel, or the in-game blueprint book, and another player can reconstruct the exact layout. Blueprints interact with the tech tree only insofar as the items and machines you place must already be researched by the receiving player.

Did You Know?

• Factorio's chemistry tech line has exactly four tiers; there is no Chemistry 5, let alone 16, in any released version of the base game.
• Chemistry 4 is the tier that unlocks rocket fuel production, which is the final ingredient needed to assemble the rocket for the space-age victory condition.
• The game's tech-tree UI visually caps each column at a fixed number of nodes, making it structurally impossible for a 'Chemistry 16' to appear without a mod or a data-file edit.
• Community mods such as Angels' Addons and K2 Chemistry do extend fluid and chemical processing far beyond the vanilla four tiers, which is likely the source of confusion behind the 'Chemistry 16' name.