# Uranium 235

Pyanodons item · internal name `u-235` · stack size 100 · first craftable in tier 4 (pY science pack 2, [tier 4](https://factorio.kalzumeus.com/tier/4.md))
HTML page: https://factorio.kalzumeus.com/item/u-235/

## Produced by (9 recipes)

### Uranium 235 (`u234-u235`)

- 0.5 s · tier 9
- Ingredients: 10 × [Uranium 234](https://factorio.kalzumeus.com/item/u-234.md), 20 × [Neutron](https://factorio.kalzumeus.com/fluid/neutron.md)
- Results: 7.992 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md) (99.9% chance of 8)
- Made in: Particle accelerator MK 01, Particle accelerator MK 02, Particle accelerator MK 03, Particle accelerator MK 04
- Unlocked by: [Nuclear Power - Stage 3](https://factorio.kalzumeus.com/tech/nuclear-power-mk03.md)

### Enrich uranium (`pa-uranium-235`)

- 15 s · tier ?
- Ingredients: 10 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 2 × [Proton donor](https://factorio.kalzumeus.com/item/proton-donor.md)
- Results: 5 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md), 0.3 × [Crystallographic substrate](https://factorio.kalzumeus.com/item/crystallographic-substrate.md) (30% chance)
- Made in: Particle accelerator MK 01, Particle accelerator MK 02, Particle accelerator MK 03, Particle accelerator MK 04
- Unlocked by an upgrade choice (script), not research

### Yellowcake isotope separation (`split-yellowcake`)

- 10 s · tier 4
- Ingredients: 10 × [Yellowcake](https://factorio.kalzumeus.com/item/yellow-cake.md)
- Results: 1 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md) (10% chance of 10), 9 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md) (90% chance of 10)
- Made in: Particle accelerator MK 01, Particle accelerator MK 02, Particle accelerator MK 03, Particle accelerator MK 04
- Unlocked by: [Nuclear research](https://factorio.kalzumeus.com/tech/uranium-processing.md)

### Uranium 238 (`uranium-seperation`)

- 20 s · tier 7
- Ingredients: 10 × [Uranium Oxide](https://factorio.kalzumeus.com/item/uranium-oxide.md)
- Results: 0.1 × [Uranium 232](https://factorio.kalzumeus.com/item/u-232.md) (1% chance of 10), 0.1 × [Uranium 233](https://factorio.kalzumeus.com/item/u-233.md) (1% chance of 10), 0.25 × [Uranium 234](https://factorio.kalzumeus.com/item/u-234.md) (2.5% chance of 10), 1 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md) (10% chance of 10), 0.8 × [Uranium 236](https://factorio.kalzumeus.com/item/u-236.md) (8% chance of 10), 1 × [Uranium 237](https://factorio.kalzumeus.com/item/u-237.md) (10% chance of 10), 6.75 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md) (67.5% chance of 10)
- Made in: Particle accelerator MK 01, Particle accelerator MK 02, Particle accelerator MK 03, Particle accelerator MK 04
- Unlocked by: [Nuclear Power - Stage 2](https://factorio.kalzumeus.com/tech/nuclear-power-mk02.md)

### Uranium 238 (`nuclear-fuel-reprocessing-mk02`)

- 100 s · tier ?
- Ingredients: 5 × [Used up uranium fuel cell MK 02](https://factorio.kalzumeus.com/item/used-up-uranium-fuel-cell-mk02.md)
- Results: 3 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 1 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md)
- Made in: Centrifuge, Centrifuge MK 01, Centrifuge MK 02, Centrifuge MK 03, Centrifuge MK 04
- Unlocked by an upgrade choice (script), not research

### Uranium 238 (`nuclear-fuel-reprocessing-mk03`)

- 100 s · tier ?
- Ingredients: 5 × [Used up uranium fuel cell MK 03](https://factorio.kalzumeus.com/item/used-up-uranium-fuel-cell-mk03.md)
- Results: 7 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 4 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md)
- Made in: Centrifuge, Centrifuge MK 01, Centrifuge MK 02, Centrifuge MK 03, Centrifuge MK 04
- Unlocked by an upgrade choice (script), not research

### Uranium 238 (`nuclear-fuel-reprocessing-mk04`)

- 100 s · tier ?
- Ingredients: 5 × [Used up uranium fuel cell MK 04](https://factorio.kalzumeus.com/item/used-up-uranium-fuel-cell-mk04.md)
- Results: 6 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 3 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md)
- Made in: Centrifuge, Centrifuge MK 01, Centrifuge MK 02, Centrifuge MK 03, Centrifuge MK 04
- Unlocked by an upgrade choice (script), not research

### Uranium 238 (`nuclear-fuel-reprocessing-mk05`)

- 100 s · tier ?
- Ingredients: 5 × [Used up uranium fuel cell MK 05](https://factorio.kalzumeus.com/item/used-up-uranium-fuel-cell-mk05.md)
- Results: 8 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 5 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md)
- Made in: Centrifuge, Centrifuge MK 01, Centrifuge MK 02, Centrifuge MK 03, Centrifuge MK 04
- Unlocked by an upgrade choice (script), not research

### Kovarex enrichment process (`kovarex-enrichment-process`)

- 10 s · tier 6 · productivity modules allowed
- Ingredients: 40 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md), 5 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md)
- Results: 41 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md), 2 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md)
- Made in: Centrifuge, Centrifuge MK 01, Centrifuge MK 02, Centrifuge MK 03, Centrifuge MK 04
- Unlocked by: [Kovarex enrichment process](https://factorio.kalzumeus.com/tech/kovarex-enrichment-process.md)

## Used in (6 recipes)

- Uranium fuel cell MK 01 (`uranium-fuel-cell`, tier 4) → [Uranium fuel cell MK 01](https://factorio.kalzumeus.com/item/uranium-fuel-cell.md)
- Kovarex enrichment process (`kovarex-enrichment-process`, tier 6) → [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md)
- Uranium pulp (stage 1) (`u235-pulp-01`, tier 6) → [Uranium pulp (stage 1)](https://factorio.kalzumeus.com/fluid/u-pulp-01.md)
- Fuel rod MK 03 (`fuelrod-mk03`, tier 7) → [Fuel rod MK 03](https://factorio.kalzumeus.com/item/fuelrod-mk03.md)
- Hydrogen proton (`pa-proton`, tier 9) → [Hydrogen proton](https://factorio.kalzumeus.com/fluid/proton.md)
- Uranium fuel cell MK 04 (`uranium-fuel-cell-mk04`, tier 10) → [Uranium fuel cell MK 04](https://factorio.kalzumeus.com/item/uranium-fuel-cell-mk04.md)