Crude Oil to Petroleum Resin Chain

Lore & Background

In the world of Factorio, the land holds a dark, viscous treasure beneath its surface. The Pumpjack—that clanking, rhythmic mechanical beast—is humanity's first and only dialogue with this resource. Each cycle draws up Crude Oil, a thick black fluid that smells of industry and possibility. It flows through pipes into the Oil Refinery, where heat and pressure coax it apart into Light Oil and Heavy Oil, a separation as old as the science of distillation. The Light Oil, lighter and more reactive, is fed back through the Refinery in a second pass, emerging as Petroleum Resin—a golden-tinged, syrupy compound that sits at a crossroads. In the Chemical Plant, it can be cracked into Sulfur, which in turn becomes Sulfuric Acid, the corrosive workhorse of the chemical age. Or it can be combined with Sodium Hydroxide to yield Plastic, a material that speaks to the synthetic ambitions of a civilization that has long since moved beyond stone and iron. Every drop of Resin represents a choice: acid or polymer, corrosion or construction. The chain is deliberately layered. No single machine can shortcut it. The player must build, balance, and babysit a pipeline of fluids and intermediates, watching the little colored dots crawl along pipe networks, listening to the Refinery's long, deliberate *clunk* as it processes each batch. It is, in the quietest way, a meditation on patience and throughput.

In Their Own Story

The pumpjack shudders and groans, its arm sweeping in that endless, hypnotic arc. You watch the first droplet of Crude Oil bead up on the collection pipe, black and iridescent, and you feel that particular Factorio thrill—the moment the ground gives something up. Three Refineries hum in a row, their vents exhaling pale steam into the evening air. The Light Oil pipes glow faintly amber as the fluid pulses through, and you've just added a second Chemical Plant to handle the Sulfur backlog. It's 11:47 PM. You tell yourself one more batch. The Resin arrives at the Chemical Plant like a small golden river. You split the output: half to Sulfur, half held in a buffer for the Plastic line. The numbers on your little spreadsheet—spreadsheet!—finally line up. The factory breathes. Somewhere in the distance, the pumpjack clanks on, indifferent and eternal, feeding the machine that feeds the machine that feeds the machine.

Reader's Guide

Step 1 – Extraction: Pumpjacks produce Crude Oil. One pumpjack per oil field is the standard starting ratio; add more as demand grows. Step 2 – First Refinery pass: The Oil Refinery converts 1 Crude Oil into 1 Light Oil + 1 Heavy Oil. This is almost always the chain's bottleneck—the Refinery has one of the longest crafting times in the game, and it can only process one input at a time. Scale Refineries aggressively. Step 3 – Second Refinery pass: Light Oil feeds back into an Oil Refinery to yield 1 Petroleum Resin per Light Oil. You now need roughly as many Refineries for this pass as for the first, doubling your total Refinery count. Step 4 – Chemical Plant: Petroleum Resin → Sulfur (1:1). Sulfur → Sulfuric Acid (1:1). Sulfuric Acid + Water → Sodium Hydroxide (1:1). Finally, Petroleum Resin + Sodium Hydroxide → Plastic (1:1 each). Optimal ratio: For every 1 Crude Oil, you get 1 Petroleum Resin and 1 Heavy Oil. If you need both Sulfur and Plastic from the same Resin pool, plan your Chemical Plant count around the Sulfuric Acid sub-chain, since it consumes the most intermediate steps. Bottleneck: The Oil Refinery, full stop. Its long crafting time means you will almost always need more Refineries than you think. The Chemical Plant is fast by comparison. Scaling: Early game, 2–3 Refineries and 1–2 Chemical Plants suffice. Mid-to-late game, expect dozens of Refineries clustered around pumpjack fields, with Chemical Plants arrayed downstream. Fluid logistics (pipe routing, buffer tanks) become as important as the machines themselves.

Did You Know?

• The Oil Refinery's crafting time is among the longest of any machine in vanilla Factorio, which is why it so frequently becomes the rate-limiting step in the entire petroleum chain.
• Heavy Oil is produced as a co-product alongside Light Oil in the first Refinery pass, meaning every drop of Crude Oil you process also yields a secondary fluid you must account for in your logistics.
• Petroleum Resin is both a reagent (consumed to make Sulfur) and a direct ingredient (combined with Sodium Hydroxide for Plastic), so a single unit of Resin can only serve one downstream path—forcing players to split thei
• The entire chain requires two distinct machine types (Oil Refinery and Chemical Plant), making it one of the few production lines where you cannot simply 'add more of the same box' to scale.