Stripping aluminum wire means removing the plastic or rubber insulation to expose the bare metal underneath, and the best method depends on the wire gauge and how much you have to process. For most people, this is a scrap recycling project: bare aluminum wire sells as “clean” scrap at a significantly higher price per pound than insulated wire, which scrap yards categorize as “dirty” aluminum. Whether you’re working through a small box of leftover electrical cable or processing hundreds of feet from a demolition job, the right approach saves time and keeps the aluminum in its best condition for resale.
Why Stripping Pays Off
Scrap yards price aluminum wire in two basic categories. Insulated wire falls under “dirty” aluminum because the plastic coating adds weight without value and requires processing on the yard’s end. Stripped aluminum wire counts as “clean” scrap and commands a higher per-pound rate. The aluminum used in most electrical wiring belongs to the 1xxx series, which is 99% pure aluminum and carries the highest scrap value of any aluminum alloy. At scrap yards, this material is often listed as “EC wire” (electrical conductor wire).
That said, stripping doesn’t always make financial sense. The payoff is best with large-gauge wire that has thick insulation, because the ratio of aluminum to plastic is high and each piece yields a meaningful amount of bare metal. Thin wire or mixed batches with lots of small-gauge pieces can eat up hours of labor for a marginal bump in price. If you have a small amount of thin wire, selling it insulated may be the smarter move.
Manual Stripping With a Knife
For small jobs, a utility knife is the most accessible tool. Lay the wire on a flat, stable surface like a workbench or a piece of plywood. Score the insulation lengthwise by running the blade along the length of the wire, applying just enough pressure to cut through the plastic without gouging the aluminum underneath. Once you have a clean slit, peel the insulation back with your fingers or pliers and slide it off.
Aluminum is softer than copper, so it nicks and gouges more easily. A deep cut into the metal won’t disqualify it from scrap recycling, but keeping your cuts shallow preserves the wire’s integrity. Some people find a hook-blade utility knife easier to control than a straight blade, since the curved edge naturally rides along the wire without digging in. For thicker cables with multiple conductors inside a single jacket, cut the outer jacket first, separate the individual wires, then strip each one.
This method works fine for a few dozen feet of wire but becomes tedious quickly on larger volumes.
Handheld Wire Strippers
A step up from a knife, handheld wire stripping tools clamp around the insulation and slice it cleanly without touching the metal. Standard electrician’s wire strippers have notched jaws sized for common wire gauges. You match the wire to the correct notch, squeeze, and pull. These are fast and precise for single conductors up to about 10 AWG.
For larger aluminum cable (4 AWG and above, the kind used in service entrance wiring or feeder lines), a dedicated cable stripper works better. These tools typically use an adjustable blade mounted in a channel that you draw along the wire’s length. They handle the thicker insulation found on large-gauge aluminum without requiring much grip strength. Some models clamp to a bench and let you pull the cable through, which speeds up repetitive work considerably.
Machine Stripping for Large Volumes
If you’re processing wire in bulk, a benchtop wire stripping machine is the standard tool. These machines use motorized rollers to feed wire past a set of adjustable blades that slit and peel the insulation in one pass. You feed the wire in one end and bare aluminum comes out the other. Most tabletop models handle wire from about 18 AWG up to 1.5 inches in diameter, covering everything from household wiring to heavy service cable.
Industrial-grade strippers go further, using rotary blade systems to handle round cable, coaxial cable, and even enamel-coated magnet wire. Blade-type machines are common for round wire with standard plastic insulation, while fiberglass wheel strippers work better for thinner film-type coatings like enamel or varnish found on motor and transformer wire. Portable air-operated models exist for stripping wire on job sites without a full bench setup.
Machine stripping is where the economics of scrap wire really start to work in your favor, since processing speed jumps from a few feet per minute to continuous feeding.
Stripping ACSR Cable
ACSR (aluminum conductor, steel reinforced) cable is a special case. This is the type of cable used on overhead power lines, and it consists of aluminum strands wound around a central steel core. Stripping ACSR isn’t just about removing insulation. You need to separate the aluminum from the steel, since scrap yards pay different rates for each metal and won’t accept them combined at aluminum prices.
For small quantities, you can cut the cable into manageable lengths, then manually unwrap the aluminum strands from the steel core using pliers or a vise. The aluminum strands are wound in layers and pull away with some effort. For larger volumes, dedicated ACSR processing machines shred the cable and use mechanical separation to sort the aluminum from the steel automatically. The end product is clean aluminum pieces and steel wire, each ready for its own scrap category.
Keeping the Aluminum Clean
Scrap yards pay the best rates for aluminum that’s free of attachments and contaminants. After stripping, remove any remaining bits of insulation, tape, connectors, or steel screws. Separate your aluminum wire from any copper wire in the batch, since mixing metals drops the value of both. If you’re working with large-gauge service entrance cable that has a bare aluminum neutral bundled with insulated conductors, strip and sort each piece individually.
Aluminum naturally forms a thin oxide layer on its surface when exposed to air. This is normal and doesn’t affect scrap value. You don’t need to polish or clean the bare wire beyond removing insulation and foreign materials.
Safety While Stripping
Wire stripping creates real hazards, especially with machines. An OSHA inspection of one wire processing facility documented a finger amputation when a worker’s hand contacted the blade of a stripping machine. Keep your hands well away from cutting surfaces, and never reach into the feed area of a powered stripper while it’s running.
Even with manual stripping, cut-resistant gloves protect against slips with a utility knife and against the sharp edges of freshly cut wire ends. Safety glasses are worth wearing since small pieces of insulation and metal can flick off during cutting. If you’re processing a large volume, the repetitive motion of feeding wire through a tool can strain your hands and wrists, so take breaks and switch grips periodically.
One more thing: make sure the wire isn’t energized. This sounds obvious, but salvaged wire from demolition or renovation sites can still be live if circuits haven’t been properly disconnected. Test with a non-contact voltage tester before handling any wire you didn’t personally disconnect.