# Butyrolactone (GBL)

Pyanodons item · internal name `gbl` · stack size 100 · first craftable in tier 7 (Production science pack, [tier 7](https://factorio.kalzumeus.com/tier/7.md))
HTML page: https://factorio.kalzumeus.com/item/gbl/

## Produced by (1 recipes)

### Butyrolactone (GBL) (`gbl`)

- 10 s · tier 7 · productivity modules allowed
- Ingredients: 1 × [Plastic bar](https://factorio.kalzumeus.com/item/plastic-bar.md), 2 × [Copper plate](https://factorio.kalzumeus.com/item/copper-plate.md), 1 × [Butynediol](https://factorio.kalzumeus.com/item/butynediol.md), 100 × [Hot air](https://factorio.kalzumeus.com/fluid/hot-air.md)
- Results: 1 × [Butyrolactone (GBL)](https://factorio.kalzumeus.com/item/gbl.md)
- Made in: Chemical plant, Chemical plant MK 01, Chemical plant MK 02, Chemical plant MK 03, Chemical plant MK 04
- Unlocked by: [BioFET](https://factorio.kalzumeus.com/tech/biofet.md)

## Used in (1 recipes)

- Polyvinylpyrrolidone (PVP) (`pvp`, tier 7) → [Polyvinylpyrrolidone (PVP)](https://factorio.kalzumeus.com/item/pvp.md)