{
    "kraft_glassine_estes_avg":
    {
        "desc": "paper, spiral, kraft, glassine outer wrap, Estes type",
        "material": "paper",
        "construction": "spiral",
        "material_attributes": ["kraft", "glassine outer wrap", "Estes type"],
        "density" : "0.894 g/cm3",
        "rmk": "average from Estes catalog specs"
    },
    "kraft_coupler_loc":
    {
        "desc": "paper, spiral, kraft, LOC coupler type",
        "material": "paper",
        "construction": "spiral",
        "material_attributes": ["kraft", "LOC coupler type"],
        "density": "0.790 g/cm3",
        "rmk": "average derived from Apogee data on LOC couplers"
    },
    "bluetube_2":
    {
        "desc": "paper, vulcanized, Blue Tube 2.0",
        "material": "paper",
        "construction": "spiral",
        "material_attributes": ["vulcanized", "BlueTube 2.0"],
        "density": "1.162 g/cm3",
        "rmk": "measured value from samples circa 2016"
    },
    "fiberglass_g12_filament_wound":
    {
        "desc": "fiberglass, G12, filament wound",
        "material": "fiberglass",
        "construction": "G12",
        "material_attributes": ["filament wound"],
        "density": "1.182 g/cm3",
        "rmk": "typical for filament wound G12 tube"
    }
}