how do you make an element break into another one?

"led_r": {
    behavior: behaviors.WALL,
    reactions: {
        "light": {"charge1":1},
        "liquid_light": {"charge1":1},
    },
    color: "#660000",
    colorOn: "#ff0000",
    category: "machines",
    tempHigh: 1500,
    stateHigh: ["molten_glass","molten_glass","molten_glass","molten_gallium"],
    conduct: 1,
    breakInto: "glass_shard"
},

"led_r": {
    behavior: behaviors.WALL,
    reactions: {
        "light": {"charge1":1},
        "liquid_light": {"charge1":1},
    },
    color: "#660000",
    colorOn: "#ff0000",
    category: "machines",
    tempHigh: 1500,
    stateHigh: ["molten_glass","molten_glass","molten_glass","molten_gallium"],
    conduct: 1,
    breakInto: "glass_shard"
},