| Matrix Code | Sample Type Code | |
| CS-Carbon Steel | NI-Nickel Alloy | 1-General Purpose Solid (OE, X-Ray) |
| LAS-Low Alloy Steel | CO-Cobalt Alloy | 2-Chip Pack Only (20g) (Dissolution Techniques) |
| TS-Tool Steel | ALW-Wrought Aluminum Alloy | 3-General Purpose Solid and Chip Pack (10g) |
| SS-Stainless Steel | ALF-Foundry Aluminum Alloy | 4-General Purpose Solid and Pin Pack (1-2g) |
| HTS-High Temp. Steel | MG-Magnesium Alloy | 5-Pin Pack Only (4-6g) |
| CU-Copper Alloy | ZN-Zinc Alloy | 6-General Purpose Solid, Pin and Chip Pack (10g) |
| TI-Titanium Alloy | OT-Other, Please Call | 7-Other, Please Call |