Grade matters more than the metal name
A scrap metal grade describes more than the metal family. Buyers consider composition, cleanliness, coating, attachments, size, product form, and the processing needed before resale or remelting. Two copper or aluminum items can therefore receive different grades, rates, or even acceptance decisions at the same facility.
Grade names are not perfectly universal. Ask your yard what it calls a material and what preparation changes the category before spending time processing it.
| Material family | Often separated by | Common disqualifiers or lower-grade factors |
|---|---|---|
| Copper | Wire, clean solids or tube, coated or soldered copper, recovery items | Insulation, solder, paint, plating, brass, steel, mixed assemblies |
| Brass | Alloy or product group, cleanliness, attachment level | Steel screws, rubber, plastic, plating, unknown alloy mix |
| Aluminum | Cans, sheet, extrusion, cast, wheels, radiators, conductor | Iron, rubber, glass, insulation, oil, moisture, mixed alloy groups |
| Stainless steel | Alloy chemistry, product form, cleanliness | Ordinary steel, attachments, unknown chemistry, oil or moisture in turnings |
| Ferrous steel and iron | Dimensions, density, preparation, product source | Oversize pieces, sealed units, fluids, prohibited or attached material |
Copper and insulated wire
Clean, unalloyed copper is generally separated from copper tubing with solder or fittings, motors, transformers, and insulated wire. Insulated wire can be graded by copper recovery, insulation, connectors, and whether the yard accepts that construction.
Never burn wire or coatings. Burning can release hazardous substances, create a fire risk, violate local rules, and make a yard reject the material.
Brass
Brass items may include plumbing fittings, valves, fixtures, and hardware. Steel screws, rubber, plastic, plated parts, and other attachments can affect the grade. A magnet can help reveal some ferrous attachments, but it cannot confirm an alloy by itself.
Aluminum
Common categories can include cans, siding, sheet, cast aluminum, extrusions, wheels, and insulated aluminum wire. Paint, iron attachments, rubber, glass, and mixed alloys can change how the yard buys the material.
Stainless steel and other alloys
Stainless grades contain different alloying elements and may be sorted with identification equipment. Some stainless is weakly magnetic or non-magnetic, so a magnet test alone does not establish its grade.
Specialty alloys, catalytic converters, electronics, batteries, refrigerant equipment, and sealed containers can have special acceptance, documentation, environmental, or safety requirements. Contact the yard before transporting them.
Ferrous steel and iron
Ferrous scrap is often separated by preparation, dimensions, density, and source. A yard may distinguish light iron, heavy melt, appliances, vehicles, and prepared steel. Ask about size limits and prohibited attachments before cutting anything.
What commonly disqualifies a cleaner grade
The most common problems are mixed composition and extra processing. Insulation, coatings, solder, paint, oil, moisture, rubber, plastic, glass, steel fasteners, fittings, sealed components, and unknown residue can move material into another grade or make it unacceptable.
Do not process an item merely to chase a grade name. Ask whether the yard buys it differently, estimate the recoverable weight, and include labor, tool wear, disposal, and safety in the decision. Never burn coatings or open sealed, energized, pressurized, refrigerant-containing, or hazardous equipment without proper qualification and authority.
A useful sorting rule
Sort only as far as you can identify the material safely and consistently. Keep an unknown item separate, photograph it, and ask the buyer. A reliable label from your yard is more valuable than a confident guess from an old online chart.
- What does your yard call this exact material?
- Which attachments or conditions move it to another grade?
- Would safe preparation change the grade enough to justify the lost weight and labor?
- Are there minimum quantities, prepared dimensions, documentation rules, or prohibited items?
- Can I send a representative photo or bring a sample before transporting the full load?
Questions people ask
Common questions
What determines the grade of scrap metal?
Composition, cleanliness, coating, attachments, size, product form, contamination, and required processing can all affect grade. The receiving yard applies its own current acceptance and buying specification.
Are scrap metal grade names the same at every yard?
No. Industry specifications support common communication, but local buying categories and preparation limits vary. Confirm the exact yard name, condition, and quote before estimating.
Does cleaning scrap always increase its value?
Not necessarily. A cleaner rate may apply to less recovered weight and require time, tools, disposal, or added risk. Compare the confirmed as-is and prepared scenarios before doing the work.
What should I do with scrap I cannot identify?
Isolate it, avoid destructive testing, record its source when appropriate, photograph it, and ask the receiving facility. Hazardous, sealed, regulated, or suspicious material may need a specialized recycler.
