Antimony adds stibnite ore, antimony metal and trioxide, bearing alloys, and phase-change memory, together with new thermal machinery and cooling equipment. Mine and refine the metal, use it in your existing manufacturing, then build a temperature-controlled production line for the memory your processors and advanced machines need.

It starts at red science with metal and additives. The memory workshop opens at green science: hold an annealing temperature, pay for a heating pulse, and cool each batch before its deadline. Built-in temperature readings and circuit controls let you tune the process.

Factorio 2.1.20 or later in the 2.1 series. Only the base game is required. Space Age, Quality and other material mods are optional.

New materials and production chains

• Stibnite ore and antimony metal. A new mineable ore on Nauvis, smelted in ordinary furnaces. Metal goes into existing fast inserters, assembler-2 drive bearings, piercing ammunition and batteries.
• Antimony trioxide. Oxidize the metal into a white powder for existing low-density structures, electrical insulation and supported modded polymers. It carries antimony into rockets, platforms and late equipment.
• Phase-change memory. A new chain of coated, annealed and qualified substrates, finished into memory for processing units, assembler 3, tier-3 modules and supported controllers.
• Babbitt and antimonial lead, with compatible tin or lead providers. Bearing and battery/ammunition alloys that enter the existing manufacturing recipes.
• InSb detector materials, with Indium and supported optics. Sealed precursors, conditioned dies and infrared detectors for existing scanners, spectroscopes and space telescopes.

New buildings and equipment

With Caesium, a clock quench station upgrades the ordinary station with timing hardware for faster memory qualification. Compatible material packs add their parts to one construction recipe per building.

A new cooling loop

The workshop turns cold inlet water into 60 °C warm water. An air cooler returns it at 25 °C for reuse. Wet cooling consumes additional makeup water; a shoreline outlet supports discharge and fresh supply. Heaters and qualification consume electricity, and the cooling equipment removes the resulting heat.

Build a line that keeps its cool

The annealer needs fifty uninterrupted seconds inside its temperature window. The quench station then pays 40 MJ per memory batch and has a deadline to shed that heat. Cold-water stock, return capacity and a dependable electric supply become part of the production line.

Automatic controls handle the dwell, heating and quench sequence. Your job is to supply and size the heat network, electric grid, coolant stock and cooling equipment. Include idle periods: stopped annealers no longer consume heat, while enabled heaters keep adding it.

The station waits if starting coolant stock or return space is insufficient. Losing coolant, return capacity or control power during an attempt can force a paid retry; loaded material stays in the station while it recovers. A correctly sized workshop runs without circuit wiring.

Start before nuclear power, then decide how much of your grid to give it:

These are rates after startup. Faster profiles tighten the cooling deadline. Precision stages keep their timing across modules and machine quality, so expansion rewards a well-supplied workshop.

Tips for a workshop that keeps running

• Start with one of each. One heater, annealer, process cooler, quench station and dry air cooler support the green profile on a short, well-stocked loop.
• Plan for idle heat. Three enabled blue-line heaters still add 3 MW when annealers stop. Use two dry air coolers or one wet cooler, plus two process coolers. Tanks absorb bursts; they cannot solve a permanent cooling deficit.
• Keep separate water supplies. Charge the whole primary loop, including idle machine stock. Feed coating wash water and wet-cooler makeup separately from a finite coolant tank.
• Let an overheated line recover. Restore cooling, turn off the heaters in their panels, wait for the cold side and annealing temperature to recover, then restart. Circuits are optional.

The FAQ explains normal ratios and common stalls. With optional Informatron installed, Informatron → Antimony brings the starter, ratios, cooling and troubleshooting guide into the game.

Give optics their own challenge

With an Indium source and a supported optical consumer, the same quench station can condition InSb detector stock. Follow 600→300 °C over sixty seconds, within ±10 °C. Cooling too quickly also misses the curve.

The infrared detectors feed existing scanners, spectroscopes and supported space telescopes. Tune a new thermal process with the equipment you already built.

Take antimony into Space Age

• Fulgora: recover antimony metal from scrap and oxidize it locally for superconductors and equipment.
• Foundries: run the existing oxidation and composite routes with their supported productivity rules.
• Electromagnetic plants: package memory with native productivity.
• Aquilo and beyond: superconductor insulation carries trioxide into quantum processors and fusion manufacture. Native fluoroketone offers a later qualification coolant with its own regeneration costs.

The precision workshop is built on Nauvis. Its materials stay useful as your factory reaches other worlds.

Fits into your material pack

Antimony changes the recipes you already use. Compatible parts combine into one construction recipe per building. Your pack's frames, drives, piping, solder and refractory materials become part of the workshop when their production is reachable.

Electronic components carry their additives into finished machines. Small doses use whole-item batches while retaining the host's original material ratios and crafting time per product. Providers keep their own dependencies and conflicts; SE and Space Age are separate configurations.

Start your first workshop

1. Research Antimony processing at red science. Mine stibnite, smelt metal and put it into your early manufacturing.
2. At green science, research Antimony thermal processing and coat substrates in a chemical plant.
3. Connect a process heater, conduits, annealer and process cooler. Hold the annealer at 250–350 °C; compatible early Tellurium widens that window.
4. Feed annealed substrates to the quench station. Supply cold water, remove the warm return, close the cooling loop and package the qualified substrates into memory.

For batch sizes, coolant reserves, circuit controls, quality and troubleshooting, open the FAQ tab. The station's status panel helps you see what your line needs next.

Credits

Antimony is by fluffy_penguin, alongside Cadmium, Tellurium, Magnesium, Phosphorus, Gallium, Neodymium and Caesium. Thanks to Brevven, trikop, the Planetfall/Ashier and Timeken collections, and the K2 and SE maintainers for the production chains this mod connects to.

Artwork uses credited industrial renders from Periodic Madness, Malcolm Riley / Unused Renders, Hurricane and Sosciencity Graphics, with the licenses and attribution included in the download. The violet quench station references Factorio's own chemical-plant artwork. The periodic-table logo is original vector artwork; the trioxide icon was made with image-generation tools. Code and original artwork use MIT; third-party artwork keeps its own license.