{
  "type": "pneumaticcraft:pressure_chamber",
  "inputs": [
    {
      "type": "pneumaticcraft:stacked_item",
      "tag": "forge:ingots/compressed_iron",
      "count": 9
    },
    {
      "tag": "forge:dusts/graphite"
    }
  ],
  "pressure": 2.0,
  "results": [
    {
      "item": "pneumaticcraft:compressed_iron_block"
    }
  ]
}