material_class,n_rows,density_kg_m3_median,density_kg_m3_p10,density_kg_m3_p90,youngs_modulus_GPa_median,youngs_modulus_GPa_p10,youngs_modulus_GPa_p90,poissons_ratio_median,poissons_ratio_fem_safe_median,n_rows_with_source_reported_density,sound_speed_m_s_median,fallback_reliability,note
wood_solid,18284,715.7,479.1,958.3,13.7414,8.4725,16.9555,0.3665,0.3665,18284,4296.0,usable,"Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched. Dominated by Global Wood Density Database v.2 (Fischer et al. 2026, CC BY 4.0); E is a calibrated density regression on almost every row and the isotropic collapse applies."
metal_nonferrous,530,2840.0,1800.0,8600.0,72.0,44.8,149.748,0.33,0.33,76,4984.0,usable,Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched.
metal_ferrous,345,7850.0,7800.0,7850.0,202.9,185.0,210.0,0.29,0.29,22,5084.0,usable,Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched.
ceramic,134,5816.9,3225.0,9680.0,192.141,89.13095,429.1568,0.2835,0.2835,133,5608.0,usable,Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched.
plastic_thermoplastic,72,1140.0,922.0,1398.0,1.74145,0.4442,3.0,0.37,0.37,72,1239.0,usable,Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched.
stone_mineral,62,2644.2,2266.0,3060.7,32.83,10.157,95.86517,0.246,0.246,62,3569.0,usable,Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched.
plastic_thermoset,56,1200.0,1170.5,1420.0,2.895,1.29075,4.35,0.35,0.35,56,1561.0,moderate (n<60),Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched.
elastomer_rubber,44,1000.0,970.0,1100.0,0.002051,9.3e-05,0.01835,0.49,0.45,44,45.0,moderate (n<60),Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched. Median nu is 0.49; use poissons_ratio_fem_safe_median (0.45) with linear tetrahedra.
wood_engineered,43,670.0,502.0,805.3,4.41,3.0,7.554,0.3665,0.3665,43,2613.0,moderate (n<60),Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched.
textile_woven,35,317.9,221.9,407.0,0.000123,3.8e-05,0.000292,0.37,0.37,34,20.0,moderate (n<60),"Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched. Mixes fabric-scale and fibre-direction rows, which differ by 5 orders of magnitude in E. The median is not meaningful; pick a row, not this default."
composite,33,1458.2,1233.0,1786.7,5.08,3.126,11.982,0.366,0.366,8,1801.0,moderate (n<60),Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched.
leather,30,860.0,860.0,860.0,0.02255,0.00955,0.05733,0.3,0.3,29,159.0,moderate (n<60),Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched.
foam_polymer,23,79.4,17.9,178.1,0.005838,0.002521,0.02657,0.2,0.2,23,379.0,moderate (n<60),Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched.
paper_cellulose,21,689.7,547.6,875.0,2.149,1.33998,5.234,0.2413,0.2413,2,1830.0,moderate (n<60),Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched.
glass,3,2230.0,2206.0,2446.0,72.0,72.0,72.0,0.228,0.228,3,5682.0,low (n<10),Class-level fallback for a part whose class is known but whose grade is not. Median over the permissive shard of this release; the p10-p90 band shows how much is lost by falling back. Not a material: prefer a grade-level row when one can be matched. WEAK FALLBACK: only 3 glass rows sit in the permissive shard; the other 424 are in the odbl shard. Load the odbl config for a representative glass value.