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Product

instrumentation cable seriesCu86Mn12Ni2 ManganinThermal EMF < 1.5 µV/K vs Cu30, 32 & 36 AWG Enamelled

WMW-30 / WMW-32 / WMW-36 Enamelled Manganin Low-Thermal-EMF30, 32 & 36 AWG enamelled Manganin (Cu86Mn12Ni2) low-thermal-EMF cryogenic wire

WMW-30, WMW-32 and WMW-36 Enamelled Manganin Cryogenic Wire drawn from precision Cu86Mn12Ni2 resistance alloy with heavy Polyimide (ML) or Formvar/Polyurethane-Nylon enamel—delivering ultra-low thermal EMF against copper (< 1.5 µV/K),.

DIN 17471 / ASTM B267
< 1.5 µV/K Low Thermal EMF
UHV Cryostat Compatible
Polyimide / Formvar Coat
Order designation
WMW-32 (32 AWG Manganin)
Insulated Ø
0.226 mm
DC R @ 295 K
13.70 Ω/m
DC R @ 77 K
12.74 Ω/m
DC R @ 4.2 K
12.33 Ω/m
All sizes (3)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Alloy comp.
Cu86 Mn12 Ni2
Precision Manganin alloy
Resistivity
0.43–0.48 µΩ·m
43–48 µΩ·cm @ 295 K
Thermal EMF
< 1.5 µV/K vs Cu
Typically ~0.6 µV/K @ 20 °C
Wire gauges
30 / 32 / 36 AWG
0.254 / 0.202 / 0.127 mm Ø
Thermal cond.
0.5 W/m·K @ 4 K
22 W/(m·K) @ 300 K
Temp. range
100 mK to 400 K
Flat ΔR (< 10 % 300K→4K)

Typical values for this cable type, based on DIN 17471 / ASTM B267 / NEMA MW 1000 — confirmed in the datasheet and quotation for your order.

Application fit

Is WMW-30 / WMW-32 / WMW-36 right for your machine?

Ideal for cryogenic nanovolt/microvolt transport measurements, Hall effect bars, Josephson/SQUID voltage standards, strain gauges and 2-wire cryostat leads where parasitic Seebeck thermal EMF against copper terminals must be eliminated.

Switchgear & control cabinet wiring

Suitable

Solders cleanly to copper PCB pads with standard SnPb or SnAgCu solder while generating < 1.5 µV/K parasitic Seebeck voltage.

Fixed installation

Suitable

Resistance changes by less than ~8–10 % between 300 K and 4.2 K, keeping RC filter time constants stable across cooldown.

Furnace, kiln & high-temp zone

Suitable

Heavy Polyimide (ML) or Formvar enamel withstands repeated liquid-helium thermal cycling and GE 7031 varnish.

Energy chain / drag chain

Not suitable

Precision solid 30–36 AWG cryogenic instrumentation wire; not for industrial drag chains.

Use PUR-HF Drag-Chain Cable
Typical machinesCryogenic Nanovolt & Quantum Hall TransportDilution Refrigerator & ⁴He Cryostat Sensor LoomsPrecision Reference Resistors & Current ShuntsHigh-Pressure Diamond Anvil Cell (DAC) Manganin GaugesSuperconducting Magnet Quench & Voltage Tap Wiring

Construction

Layer by layer

WMW-30 / WMW-32 / WMW-36 showing solid annealed Cu86Mn12Ni2 Manganin alloy wire and concentric Heavy Polyimide (ML) or solderable Polyurethane-Nylon / Formvar thin-wall enamel insulation.

123
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Solid annealed Manganin (Cu86Mn12Ni2) conductorPrecision vacuum-melted 86 % Copper, 12 % Manganese, 2 % Nickel solid wire (30, 32 or 36 AWG)Stabilized for ±15 ppm/K TCR at 20 °C and < 1.5 µV/K EMF vs Cu
2Heavy Polyimide (ML) or Formvar/Polyurethane enamelConcentric 12–16 µm radial wall of NEMA MW 16-C Polyimide or MW 28-C solderable enamelHigh dielectric breakdown (≥ 800 V rms) with minimal thermal barrier for heat-sinking
3Thermal-anchoring protective enamel overcoatCryogenic varnish-compatible cured Polyimide / Formvar protective topcoatBonds to OFHC copper heat-sink bobbins with GE 7031 or Stycast

WMW-30 (30 AWG · 0.254 mm Bare Ø)

9.46 Ω/m (295 K) enamelled Manganin wire for cryostat heaters, voltage taps and durable sensor leads

WMW-32 (32 AWG · 0.202 mm Bare Ø)

13.7 Ω/m (295 K) enamelled Manganin wire balancing mechanical strength and low 4 K heat load

WMW-36 (36 AWG · 0.127 mm Bare Ø)

34.7 Ω/m (295 K) ultra-fine enamelled Manganin wire for micro-watt heat leak to ≤ 1 K stages

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on DIN 17471 / ASTM B267 / NEMA MW 1000. Values for your order are confirmed in the datasheet and quotation.

Electrical

DC resistance @ 295 K
9.46 Ω/m (WMW-30) · 13.7 Ω/m (WMW-32) · 34.7 Ω/m (WMW-36)
DC resistance @ 77 K / 4.2 K
≈ 93 % of 295 K value (@ 77 K) · ≈ 90 % of 295 K value (@ 4.2 K)
Thermoelectric EMF vs Cu
< 1.5 µV/K (0 to +100 °C) — 25× lower than Constantan (~40 µV/K)
Temp. coeff. of resistance
± 15 ppm/K (+15 °C to +35 °C parabola peak)

Thermal

Operating temperature
100 mK to 400 K (+127 °C) · Polyimide ML version to +220 °C
Thermal conductivity
22 W/(m·K) @ 300 K · 13 W/(m·K) @ 77 K · 0.5 W/(m·K) @ 4.2 K
Specific heat @ 300 K
≈ 410 J/(kg·K)

Mechanical

Bare conductor diameter
0.254 mm (30 AWG) · 0.202 mm (32 AWG) · 0.127 mm (36 AWG)
Insulated outer diameter
0.279 mm (30 AWG) · 0.226 mm (32 AWG) · 0.147 mm (36 AWG)
Tensile strength (annealed)
400 to 520 MPa with ≥ 15 % elongation

Resistance

Piezo-resistive coeff.
≈ +2.3 × 10⁻⁶ / bar (used as primary high-pressure manometer gauge)
Solvent & varnish resist.
Withstands GE 7031 varnish, ethanol, acetone & Stycast epoxies
Solderability
Readily soldered with RMA rosin or mild organic flux (unlike stainless)

Reference standards

Resistance alloy std
DIN 17471 (CuMn12Ni) & ASTM B267 Class 9
Enamel insulation std
NEMA MW 1000 (MW 16-C / MW 28-C) & IEC 60317
RoHS & REACH
2011/65/EU & EC 1907/2006 compliant

Identification

Enamel colours
Amber/Clear, Red, Green or Blue for cryostat channel coding
Customs tariff (HS)
8544.1900
Spool packaging
Precision-wound cleanroom spools (30 m, 100 m, 300 m, 500 m)

Sizes

3 standard WMW-30 / WMW-32 / WMW-36 enamelled Manganin configurations

AWG gauge, bare/insulated diameter, DC resistance at 295 K, 77 K and 4.2 K, and thermal conductivity.

Dimensions & cryogenic resistance
Order designationAWG & bare ØInsul. Ø
mm		R @ 295K
Ω/m		R @ 77K
Ω/m		R @ 4.2K
Ω/m		Enquiry
Enamelled Manganin (Cu86Mn12Ni2) Cryogenic Resistance Wire
WMW-30 (30 AWG Manganin)30 AWG · 0.254 mm Bare Ø0.2799.468.808.51
WMW-32 (32 AWG Manganin)32 AWG · 0.202 mm Bare Ø0.22613.7012.7412.33
WMW-36 (36 AWG Manganin)36 AWG · 0.127 mm Bare Ø0.14734.7032.2731.23
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Can also be ordered as factory-twisted pairs (WDT-MN) or woven 12-pair looms (WQL-MN).

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
100 % linear DC resistance (@ 20 °C), laser micrometer & pinhole checkResistance within ±2 % and zero enamel pinholes per NEMA MW 1000Every manufactured spool
Sample tests
Thermoelectric Seebeck EMF vs OFHC Copper verificationThermal EMF < 1.5 µV/K between 0 °C and +100 °CPer alloy melt
Liquid helium (4.2 K) resistance ratio & enamel bend adhesion testR(4.2K)/R(295K) = 0.90 ± 0.02 with zero enamel flakingQualification test

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

DIN 17471 CuMn12NiASTM B267 Class 9NEMA MW 1000 Enamel

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

Spool label: TEBAOFLEX WMW-30 / WMW-32 / WMW-36 MANGANIN CRYO
Delivery form
Fumigated wooden drums, steel reels or precision spools
Standard lengths
500 m · 1000 m (or custom cut/spooled lengths)
MOQ
100 m (standard) · 500 m (custom)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFWMW-30 / WMW-32 / WMW-36 Enamelled Manganin Low-Thermal-EMF – technical datasheet3 sizes · construction, technical data, approvalsXLSXWMW-30 / WMW-32 / WMW-36 spec data (Excel)All 3 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

Why do physicists prefer Manganin (WMW) over Constantan (Cu55Ni45) for low-voltage cryogenic measurements?
Although both Constantan and Manganin have low thermal conductivity and flat resistance vs temperature, Constantan has a huge thermoelectric (Seebeck) coefficient against copper (~40 µV/K—in fact, Copper/Constantan is a Type T thermocouple!). Any slight temperature asymmetry where Constantan wires meet copper terminals creates tens of microvolts of DC offset error. Manganin against copper has a thermal EMF < 1.5 µV/K (~0.6 µV/K typical), eliminating thermal offset drift.
Does Manganin exhibit any magnetic behaviour below 4 K?
Because Manganin contains 12 % Manganese and 2 % Nickel, it undergoes a spin-glass magnetic transition below ~40 K that can introduce slight low-temperature magnetoresistance or susceptibility in ultra-sensitive SQUID pick-up loops. For strictly zero-susceptibility wiring near SQUIDs or in 20 T magnets, use Phosphor-Bronze (WDT/WQT).
Why is Manganin wire also used inside high-pressure Diamond Anvil Cells (DACs) and shock-wave gauges?
Manganin combines a near-zero temperature coefficient of resistance (±15 ppm/K at ambient) with a well-calibrated, linear positive pressure coefficient of resistance (+2.3 × 10⁻⁶ / bar), allowing direct electrical measurement of gigapascal (GPa) pressures.
How do you strip and solder Polyimide vs Polyurethane-Nylon enamelled Manganin?
Polyurethane-Nylon (MW 28-C) enamel is heat-strippable directly with a +380 °C soldering iron droplet. Heavy Polyimide (MW 16-C) will not melt under a soldering iron and should be stripped with a precision mechanical blade/tweezers or chemical stripper before soldering with RMA rosin flux.

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WMW-30 / WMW-32 / WMW-36 Enamelled Manganin Low-Thermal-EMF

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