O / H11
Softest rod. Best for fine wire, magnet wire and flattening into rectangular winding conductor, and gives the highest finished conductivity.
Conductor rod guide
1370 Aluminium Wire Rod for Electrical Use
1370 wire rod is a higher-purity electrical aluminium (at least 99.70 % Al, EN AW-1370 / EAl99.7) that conducts slightly better than 1350 and draws to fine sizes with fewer breaks. It is chosen for winding wire, magnet wire, fine stranded conductors and other products where a fraction of a percent more conductivity, or better drawability, pays for the purer metal.
- Grade
- 1370 (Al ≥ 99.70 %)
- Conductivity
- Typically about 62 % IACS
- Tempers
- O, H11 – H16
- Standards
- EN 1715-2 · GOST 13843
1370 or 1350: what is the difference?
Both grades are electrical-conductor aluminium with controlled titanium, vanadium, chromium and manganese, and both use boron to tie up the residual transition metals. The difference is purity. 1370 requires 99.70 % aluminium and caps iron at 0.25 % and copper at 0.02 %, against 0.40 % and 0.05 % for 1350.
Lower iron and copper mean a little more conductivity and fewer hard intermetallic particles. In practice the conductivity gain is modest, typically a few tenths of a percentage point of IACS, but the cleaner structure helps when rod is drawn to very fine diameters or flattened into rectangular winding conductor, where particles trigger breaks and surface defects.
The price premium for 1370 depends on the cost of higher-purity primary metal. For standard overhead conductor and power cable, 1350 remains the economical choice; 1370 earns its place in winding wire, fine wire and premium low-loss products.
| Point | 1350 | 1370 |
|---|---|---|
| Minimum aluminium | 99.50 % | 99.70 % |
| Iron / copper limits | 0.40 / 0.05 % | 0.25 / 0.02 % |
| Typical conductivity | ≈ 61.5 – 62 % IACS | ≈ 62 % IACS and slightly above |
| Drawability to fine sizes | Good | Better |
| Main products | Overhead conductors, power cable | Winding and magnet wire, fine wire, low-loss conductors |
| ASTM rod specification | ASTM B233 | No dedicated ASTM rod standard; ordered to EN 1715-2 or by agreement |
1370 chemical composition (wt %)
| Element | 1350 | 1370 |
|---|---|---|
| Silicon (Si) | ≤ 0.10 | ≤ 0.10 |
| Iron (Fe) | ≤ 0.40 | ≤ 0.25 |
| Copper (Cu) | ≤ 0.05 | ≤ 0.02 |
| Manganese (Mn) | ≤ 0.01 | ≤ 0.01 |
| Magnesium (Mg) | — | ≤ 0.02 |
| Chromium (Cr) | ≤ 0.01 | ≤ 0.01 |
| Zinc (Zn) | ≤ 0.05 | ≤ 0.04 |
| Boron (B) | ≤ 0.05 | ≤ 0.02 |
| Gallium (Ga) | ≤ 0.03 | ≤ 0.03 |
| Vanadium + titanium (V + Ti) | ≤ 0.02 | ≤ 0.02 |
| Others, each / total | ≤ 0.03 / ≤ 0.10 | ≤ 0.02 / ≤ 0.10 |
| Aluminium (Al) | ≥ 99.50 | ≥ 99.70 |
Registered limits for 1370 and 1350. In the Russian system the corresponding grade is АД00Е (1010Е); European designation EN AW-1370 [EAl99.7].
Rod tempers and how to choose
Rod temper is set by the rolling temperature and the cooling of the rod at the end of the mill. Tempers run from fully annealed O through the strain-hardened H11 to H16 classes. EN 1715-2 and national standards give tensile ranges and minimum conductivities for each class; the ranges are of the same order as those for 1350 rod (roughly 80–150 MPa from H11 to H16).
H12 / H13
General-purpose drawing rod for insulated cable and medium-fine wire.
H14 / H16
Harder rod for wire that must reach high tensile strength after drawing, such as conductor strands.
Ask for the guaranteed tensile range and minimum conductivity of the class you order to be shown on the certificate.
Sizes, coils and linear mass
Typical supply
- Diameter
- 9.5 mm standard; 7.6, 12, 15, 19 and 24 mm on request
- Tolerance
- About ± 0.3 – 0.5 mm and limited ovality, depending on size
- Coil
- Large coils on pallets, strapped at several points; coil weight to suit your pay-off
- Marking
- Tag with grade, temper, diameter, lot and net weight
| Diameter (mm) | Area (mm²) | Linear mass (kg/m) |
|---|---|---|
| 7.6 | 45.4 | 0.123 |
| 9.5 | 70.9 | 0.192 |
| 12 | 113.1 | 0.306 |
| 15 | 176.7 | 0.478 |
| 19 | 283.5 | 0.767 |
| 24 | 452.4 | 1.224 |
| 25 | 490.9 | 1.328 |
Where 1370 rod is used
- Transformer and motor windings: round and rectangular enamelled or paper-covered wire
- Magnet wire: fine enamelled wire for coils, chokes and solenoids
- Fine and flexible conductors: multi-wire strands that need many drawing passes
- Low-loss power conductors: where specification calls for maximum conductivity
- Strip and tape: rod rolled flat for transformer foil leads and shielding
Drawing and annealing tips
- Match rod to lineAgree temper class with the drawing-machine supplier; soft rod on fine-wire lines reduces breaks.
- Keep it cleanStore rod dry and covered; oxide and dirt on the surface carry into the dies.
- Lubricate and coolUse emulsion or oil suited to aluminium and keep dies polished.
- Anneal for windingsContinuous or batch annealing restores ductility and conductivity in winding wire before enamelling.
- Test finished wireMeasure resistivity, elongation and spring-back on the finished size.
References and standards
- EN 1715-2 – Aluminium and aluminium alloys. Drawing stock. Specific requirements for electrical applications
- EN 573-3 – Chemical composition and form of wrought products
- GOST 4784-97 – Aluminium and wrought aluminium alloys. Grades (АД00Е / 1370)
- ASTM B233 – Aluminum 1350 Drawing Stock for Electrical Purposes (comparison grade)
- The Aluminum Association – International Alloy Designations and Chemical Composition Limits
1370 aluminium (aluminum) wire rod: frequently asked questions
Is 1370 more conductive than 1350?
Slightly. Both are about 62 % IACS; 1370 is typically a few tenths of a percentage point higher because iron and copper are lower.
Why choose 1370 rod if the conductivity gain is small?
Because it is cleaner. Fewer intermetallic particles mean fewer breaks when drawing fine wire and better surface on flattened winding conductor.
Which standard covers 1370 wire rod?
EN 1715-2 in Europe and GOST 13843 in the CIS. ASTM B233 covers only 1350, so 1370 is otherwise ordered by agreement on chemistry, temper and conductivity.
What is the Russian equivalent of 1370?
АД00Е (digital 1010Е) in GOST 4784, with 99.70 % minimum aluminium.
What sizes are available?
Mainly 9.5 mm, with 7.6 to 24 mm available, in coils with mill test certificates.
Need 1370 rod for winding or fine wire?
Send diameter, temper class, standard and monthly quantity. We will reply with specification and delivered pricing.
