# Zinc processing - Stage 4 (technology)

internal name `zinc-mk04` · tier 7 (Production science pack, [tier 7](https://factorio.kalzumeus.com/tier/7.md))
HTML page: https://factorio.kalzumeus.com/tech/zinc-mk04/

## Cost

1200 units of (1 × [Production science pack](https://factorio.kalzumeus.com/item/production-science-pack.md), 2 × [pY science pack 3](https://factorio.kalzumeus.com/item/py-science-pack-3.md), 3 × [Chemical science pack](https://factorio.kalzumeus.com/item/chemical-science-pack.md), 6 × [pY science pack 2](https://factorio.kalzumeus.com/item/py-science-pack-2.md), 10 × [Logistic science pack](https://factorio.kalzumeus.com/item/logistic-science-pack.md), 20 × [pY science pack 1](https://factorio.kalzumeus.com/item/py-science-pack-1.md), 30 × [Automation science pack](https://factorio.kalzumeus.com/item/automation-science-pack.md), 6 × [Military science pack](https://factorio.kalzumeus.com/item/military-science-pack.md)), 300 s each.

## Requires (2)

- [Production science pack](https://factorio.kalzumeus.com/tech/production-science-pack.md)
- [Zinc processing - Stage 3](https://factorio.kalzumeus.com/tech/zinc-mk03.md)

## Leads to (1)

- [Zinc processing - Stage 5](https://factorio.kalzumeus.com/tech/zinc-mk05.md)

## Unlocks (2 recipes)

### Molten zinc (`molten-zinc-04`)

- 4 s · tier 7
- Ingredients: 1 × [Reduced 99.9% zinc](https://factorio.kalzumeus.com/item/reduced-zinc.md), 3 × [Limestone](https://factorio.kalzumeus.com/item/limestone.md), 150 × [Heavy oil](https://factorio.kalzumeus.com/fluid/heavy-oil.md)
- Results: 200 × [Molten zinc](https://factorio.kalzumeus.com/fluid/molten-zinc.md)
- Made in: Advanced foundry MK 01, Advanced foundry MK 02, Advanced foundry MK 03, Advanced foundry MK 04
- Unlocked by: [Zinc processing - Stage 4](https://factorio.kalzumeus.com/tech/zinc-mk04.md)

### Reduced 99.9% zinc (`reduced-zinc`)

- 4 s · tier 7
- Ingredients: 1 × [High grade zinc](https://factorio.kalzumeus.com/item/high-grade-zinc.md), 2 × [Sodium sulfate](https://factorio.kalzumeus.com/item/sodium-sulfate.md), 50 × [Diesel](https://factorio.kalzumeus.com/fluid/diesel.md), 100 × [Pressurized air](https://factorio.kalzumeus.com/fluid/pressured-air.md)
- Results: 1 × [Reduced 99.9% zinc](https://factorio.kalzumeus.com/item/reduced-zinc.md)
- Made in: Direct reduction plant
- Unlocked by: [Zinc processing - Stage 4](https://factorio.kalzumeus.com/tech/zinc-mk04.md)