Incendiary Round

Lore & Background

In the industrial sprawl that the player builds across the alien landscape, the Incendiary Round represents a shift from precision to overwhelming force. Where the pistol's bullet is a single, calculated impact, the Flamethrower's stream of burning fuel is a declaration of total commitment to the fight. The round itself is deceptively simple: a casing of iron, a core of polymer, and a volatile petroleum charge that ignites on release. Yet its creation demands a factory that has already mastered oil extraction, refining, and chemical synthesis. For the player, the first batch of Incendiary Rounds often marks a psychological threshold. The factory has grown beyond simple smelting and assembly. Pumpjacks throb in the distance, oil refineries vent plumes of vapor, and chemistry labs hum with the quiet alchemy of turning crude resources into something that burns. The Flamethrower in the player's hand is no longer a novelty—it is a tool of last resort, a wall of flame between the growing empire of belts and furnaces and the endless tide of chittering biters beyond the perimeter. The Incendiary Round also speaks to Factorio's broader design philosophy: every weapon is a production problem. You do not simply find a flamethrower; you build the infrastructure to sustain it. Each drop of fuel is a small victory of logistics over chaos, and the hiss of the Flamethrower is the sound of a factory that has decided to defend itself with fire.

In Their Own Story

The night the biter swarm crested the ridge, Mara did not reach for the pistol. She had learned that lesson three weeks ago, when a column of forty hostiles had chewed through her iron plate stockpile in eleven seconds. Instead, her fingers found the heavy, slightly warm grip of the Flamethrower, and the fuel gauge glowed a steady amber. She stepped to the edge of the conveyor junction, where the iron plates streamed east and the plastic pellets streamed north, and she pulled the trigger. The first jet of flame was a thin, wavering tongue, licking the air with a sharp crackle. Then the stream thickened, bloomed into a roaring cone of orange, and the world in front of her became a wall of light. The biters did not scatter. They simply ceased to exist, their chitinous bodies flash-cooking in the heat, leaving behind faint scorch marks on the alien red soil. The fuel gauge ticked down. Mara watched it with the same calm she applied to every other gauge in the factory—the oil level in the refinery, the buffer count on the inserter, the temperature in the furnace. A resource. A number. A problem to be solved by building another pumpjack, another refinery, another chemistry lab. She released the trigger, let the last wisp of flame curl and die, and turned back toward the humming machinery that would, in time, make the next swarm a non-event.

Reader's Guide

The Incendiary Round is crafted in a Chemistry Lab. Its direct inputs are an Iron Plate and a Plastic, with the Plastic itself requiring an Iron Plate and one unit of Petroleum. This means each Incendiary Round effectively consumes 2 Iron Plates and 1 Petroleum, plus the electricity to run the furnaces and chemistry labs. Upstream chain: Iron Ore is smelted in a Smelting Furnace into Iron Plates. Oil is extracted by a Pumpjack and refined in an Oil Refinery into Petroleum. The Chemistry Lab then combines Iron Plate + Petroleum into Plastic, and finally Iron Plate + Plastic into the Incendiary Round. The typical bottleneck is the Petroleum supply, since oil infrastructure (pumpjacks, storage tanks, refineries) is bulky and requires significant land and power. Early on, a single Oil Refinery may not keep up with demand for both Plastic and direct Petroleum uses. Scaling the chain means adding more pumpjacks and refineries in parallel, and ensuring the Chemistry Lab has enough inserter throughput for both the Plastic recipe and the Incendiary Round recipe. As the factory grows, the Iron Plate supply becomes trivial (multiple furnaces and mining drills), and the constraint shifts entirely to the oil pipeline. A well-organized layout places the Oil Refinery adjacent to the Chemistry Lab to minimize belt routing, and uses buffer chests between the refinery and lab to smooth out the discrete batch outputs of the refinery against the continuous consumption of the lab.

Did You Know?

• The Flamethrower consumes Incendiary Rounds as a continuous fuel stream rather than as individual shots, meaning a single round can sustain several seconds of flame output.
• Because Plastic is also a component of the Incendiary Round, the item indirectly depends on the Oil Refinery, making it one of the few ammunition types that requires petrochemical infrastructure.
• The Flamethrower is one of the later-game weapons in Factorio, and its fuel dependency means players must balance combat ammunition production against the many other uses of Plastic and Petroleum in the factory.
• In terms of crafting, the Incendiary Round and the standard Bullet share a Chemistry Lab crafting station, but the Incendiary Round's additional Petroleum dependency makes it a step further along the production tree.