{
    "type": "pneumaticcraft:pressure_chamber",
    "inputs": [
      {
        "tag": "forge:nuggets/silicon"
      },
      {
        "tag": "forge:dusts/hop_graphite"
      },
      {
        "tag": "forge:dusts/coal_coke"
      }
    ],
    "pressure": 4.0,
    "results": [
      {
        "item": "immersiveengineering:ingot_hop_graphite"
      }
    ]
  }