Approved DAMAS for North America 
SM20 - 20% Au, Noble Crown and Bridge Alloy, Type IV
SM20 is an economic golden crown and bridge alloy from Strategy Milling. It is suitable for full-cast crowns and bridges, inlays, and onlays.
Advantages
- Affordable, yellow crown and bridge alloy
- Rich yellow color
- Economical due to low density
- Brilliant high gloss achieved with ease by polishing
Indications
- Onlays
- 3/4 crowns
- Crowns
- Telescope and conus crowns
- Root canal post and cores
- Short- and long-span bridges
- Inlays and onlays
Composition
Ag 40.75
Au 20.0
Pd 14.0
In 11.0
Cu 10.75
Sn 2.0
Zn 0.5, Pd 1.0, Ru 1.0
Technical data
| Type | Noble |
| Color | Yellow |
| Density (g/cm³) | 10.8 |
| Melting range (°C) | 750 - 840 C |
| Casting temperature (°C) | 960 - 1020 C |
| Modulus of Elasticity (MPa) | 90 |
| Elongation (%) - As cast | 5 |
| Vickers hardness - As cast | 195 |
| 0.2% proof stress (MPa) - As cast | 195 |
| Tensile Strength (MPa) - As cast | 570 |