| # Densities of materials in kg/m^3. | |
| # FIXME: friction belongs per pair of materials; genesis-world resolves `max(mu_a, mu_b)` | |
| # until it supports pairs. | |
| # --- polymers --- | |
| abs_plastic: | |
| rho: 1040.0 # ABS (MatWeb, injection-moulding grades) | |
| polypropylene: | |
| rho: 920.0 # PP homopolymer (MatWeb) | |
| hdpe: | |
| rho: 950.0 # High-density polyethylene (MatWeb) | |
| acrylic_pmma: | |
| rho: 1180.0 # Cast PMMA (MatWeb) | |
| nylon: | |
| rho: 1140.0 # Nylon 6/6, unfilled (MatWeb) | |
| silicone_rubber: | |
| rho: 1200.0 # Unfilled silicone elastomer (MatWeb) | |
| # --- ceramics and glass --- | |
| stoneware_ceramic: | |
| rho: 2300.0 # Glazed stoneware (Ceramic Industry handbook) | |
| porcelain: | |
| rho: 2400.0 # Vitrified porcelain (Ceramic Industry handbook) | |
| glass: | |
| rho: 2500.0 # Soda-lime glass (Corning) | |
| # --- metals --- | |
| aluminium: | |
| rho: 2700.0 # Al 6061-T6 (MatWeb) | |
| steel: | |
| rho: 7850.0 # Low-carbon steel (MatWeb) | |
| stainless_steel: | |
| rho: 7900.0 # AISI 304 (MatWeb) | |
| # --- wood and paper --- | |
| pine: | |
| rho: 500.0 # Softwood at 12% moisture (Wood Handbook Tab. 4-3) | |
| oak: | |
| rho: 750.0 # Red oak at 12% moisture (Wood Handbook Tab. 4-3) | |
| plywood: | |
| rho: 600.0 # Softwood plywood (APA Engineered Wood Handbook) | |
| cardboard: | |
| rho: 700.0 # Solid-fibre paperboard (TAPPI) | |
| paper: | |
| rho: 800.0 # Uncoated office paper (TAPPI) | |
| # --- moulded replicas --- | |
| # Bulk density over the solid collision volume. A replica is a hollow shell, so this sits far below | |
| # the polymer it is moulded from. | |
| plastic_produce: | |
| rho: 100.0 # Geometric mean of the seven produce twins weighed in #3638, which span 50-160 | |