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High-temperature wires & cablesType MG & UL 5107600 Vac · 450 °C27% NiCu + Mica + Glass

Mica Glass High-Temperature Wire (Type MG & UL AWM Style 5107)600 Vac 450 °C 27% nickel-clad copper, mica-tape & fiberglass-braided lead wire

Extreme-temperature 600 Vac single-core furnace and heater lead wire to Type MG and UL 758 Style 5107, pairing a 27% nickel-clad copper conductor with lapped phlogopite mica tapes and a treated fiberglass outer braid for +450 °C continuous duty.

Flame-retardant

Outdoor & humid

Approved

Preview configuration

Order designation: Type MG / UL 5107 · 14 AWG
Nominal OD: 3.72 mm
Mica+Braid: 0.92 mm
Mass ≈: 31.8 kg/km
Max. DC res.: 11.5 Ω/km

Check against my drum All sizes (12)

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Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum

Max. operating T: +450 °C
Rated voltage: 600 Vac
Insulation: Mica + Glass
AWG range: 26 AWG–4/0 AWG
Conductor: 27% NiCu / Ni
Min. bend radius: 6 × OD / 10 × OD

Typical values for this cable type, based on UL 758 Style 5107 & Type MG — confirmed in the datasheet and quotation for your order.

Application fit

Is Type MG / UL 5107 Mica-Glass right for your machine?

Phlogopite/synthetic mica tape + braided fibreglass wire for extreme +450 °C to +500 °C continuous heat in steelworks, glass furnaces and foundry heaters.

Furnace, kiln & high-temp zone

Suitable

Primary duty — blast furnaces, kilns, band heaters and steelworks hot zones up to +500 °C.

Switchgear & control cabinet wiring

Suitable

Internal busbar and resistor-bank interconnections inside high-power thermal equipment.

Motor stator, traction & converter leads

With conditions

Suitable for dry high-temperature furnace fan and heater terminals supported on insulators.

Immersion & wet locations

Not suitable

Fibreglass outer braid absorbs moisture; never use in submerged or wet outdoor service.

Use PFA High-Temp Wire

Motorised monospiral reel

Not suitable

Mica-glass insulation is for static or gently flexed hot-zone runs, not dynamic reeling.

Use (N)SHTÖU Reeling

Typical machinesIndustrial furnaces, kilns & heat-treat ovensExtruder barrel band & cartridge heatersGlass-melting & metallurgical equipmentCommercial pizza, bakery & catering ovensBurner ignition & flame-rod assembliesFoundry & refractory sensor lead-outs

Construction

Layer by layer

A concentric-stranded 27% nickel-clad copper conductor (ASTM B355 Class 27, or pure nickel) is wrapped with overlapping composite phlogopite/muscovite mica tapes as the primary 600 Vac dielectric barrier and armored with a closely woven, high-temperature saturant-treated E-glass fiberglass outer braid.

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	27% nickel-clad copper conductor	Stranded 27% nickel-coated annealed copper per ASTM B355 Class 27 (or pure nickel conductor), 26 AWG to 4/0 AWGASTM B355 / UL 758
2	Composite mica-tape dielectric	Helically lapped phlogopite/muscovite mica tapes providing non-melting 600 Vac primary dielectric isolation up to +450 °CUL 758 Style 5107
3	Treated E-glass fiberglass braid	Closely woven E-glass fiberglass outer braid finished with high-temperature silicone or PTFE dispersion saturantUL 758 Style 5107

Type MG · 22 AWG to 2 AWG

600 V · 450 °C · 27% nickel-clad copper + composite mica tape + high-temperature treated fiberglass braid for furnace and heater leads

UL AWM Style 5107 · 26 AWG to 550 kcmil

600 Vac · 450 °C · UL 758 recognized mica-tape + treated fiberglass-braided appliance wiring material

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on UL 758 Style 5107 & Type MG. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage: 600 Vac continuous rating (UL 758 Style 5107 & Type MG)
Dielectric & spark test: 2.0 kV RMS AC dielectric withstand test + 6.0 kV Vac in-line spark test per UL 758
Conductor metallurgy: Stranded 27% nickel-clad or nickel-plated annealed copper per ASTM B355 Class 27 (or pure nickel option for extreme thermal cycling)

Thermal

Operating temperature range: −60 °C to +450 °C continuous operating temperature (short-term mica dielectric excursion up to +550 °C)
Inorganic non-melting barrier: Phlogopite mica and E-glass fibers do not melt or drip under radiant heat or direct flame contact

Mechanical

Insulation & braid system: Helically lapped phlogopite/muscovite composite mica tapes covered by a closely woven silicone- or PTFE-treated E-glass fiberglass braid
Minimum bending radius: 6 × OD fixed; 10 × OD flexing

Resistance

Flammability & fire behaviour: UL VW-1 / Horizontal & Vertical flame resistant; inorganic mica + glass dielectric does not melt, drip or propagate flame
Moisture & environment note: Designed for dry high-temperature zones; protect terminations from liquid moisture or condensation

Reference standards

Applicable standards: UL 758 AWM Style 5107; North American Type MG; CSA C22.2 No. 210; ASTM B355 Class 27
Environmental compliance: Asbestos-free, RoHS & REACH compliant inorganic mica-glass system

Identification

Recognized style routes: Type MG (22 to 2 AWG reference) & UL AWM Style 5107 (26 AWG to 550 kcmil)
Standard braid colours: Natural tan/white with optional colour tracer threads (Black, Red, Blue, Yellow, Green, Brown)

Sizes

12 representative sizes across Type MG & UL AWM Style 5107 (24 AWG to 2 AWG)

Nominal 27% NiCu stranding, conductor diameter, composite mica + fiberglass wall, overall diameter, mass and DC resistance at 20 °C.

Dimensions, weights & DC resistance
Style · AWG size	Size AWG	CSA ≈ mm²	Stranding (count/AWG)	Conductor metallurgy	Cond. Ø mm	Mica+Braid mm	Nominal OD mm	Mass ≈ kg/km	Max. DC res. (20 °C) Ω/km
Type MG / UL 5107 · 24 AWG	24 AWG	0.24	7/32	27% NiCu	0.61	0.84	2.30	7.8	118.0
Type MG / UL 5107 · 22 AWG	22 AWG	0.38	7/30	27% NiCu	0.76	0.85	2.46	9.8	74.5
Type MG / UL 5107 · 20 AWG	20 AWG	0.62	10/30	27% NiCu	0.97	0.85	2.67	12.6	46.8
Type MG / UL 5107 · 18 AWG	18 AWG	0.96	16/30	27% NiCu	1.22	0.88	2.98	16.9	29.4
Type MG / UL 5107 · 16 AWG	16 AWG	1.31	26/30	27% NiCu	1.50	0.90	3.30	22.8	18.2
Type MG / UL 5107 · 14 AWG	14 AWG	2.08	41/30	27% NiCu	1.88	0.92	3.72	31.8	11.5
Type MG / UL 5107 · 12 AWG	12 AWG	3.31	65/30	27% NiCu	2.36	0.95	4.27	45.6	7.2
Type MG / UL 5107 · 10 AWG	10 AWG	5.26	105/30	27% NiCu	2.95	1.00	4.95	68.5	4.5
Type MG / UL 5107 · 8 AWG	8 AWG	8.37	133/29	27% NiCu	3.73	1.15	6.05	106.0	2.8
Type MG / UL 5107 · 6 AWG	6 AWG	13.3	133/27	27% NiCu	4.70	1.25	7.20	162.0	1.8
Type MG / UL 5107 · 4 AWG	4 AWG	21.2	133/25	27% NiCu	5.90	1.35	8.60	248.0	1.1
Type MG / UL 5107 · 2 AWG	2 AWG	33.6	259/26	27% NiCu	7.42	1.50	10.42	382.0	0.7

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
UL AWM Style 5107 extends from 26 AWG up to 550 kcmil; pure nickel (Nickel 200) conductors are available on request for temperatures above 450 °C.

Reel check

Will it fit your machine?

A first screen using datasheet values. Engineering confirms drum geometry, acceleration and tension with your quotation.

Cable sizeDrum core diameter (mm)

Cable length on drum (m)

Enter your drum core diameterMinimum for this size is about 44 mm

Minimum bending radius: 22 mm
Min. drum core diameter: ≈ 44 mm
Cable weight on drum: 3.2 kg
Outer diameter: 3.7 mm

Indicative only: based on the datasheet outer diameter and 6 × OD bending radius. Current derating for wound layers per DIN VDE 0298-4 is assessed separately.

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.

ConductorClass 5 stranding
Spark test100 % in-line
Lay-upCores, earth, fillers
SheathingInner, braid / screen, outer
Electrical testsAC voltage, resistance
DimensionsOD, wall thickness
Inspection documents & dispatchDrum & dispatch

Testing & inspection	Test value / reference	Frequency
Routine tests
AC dielectric & in-line spark test	2.0 kV RMS dielectric test and 100% 6.0 kV Vac spark test per UL 758 Style 5107	Every spool
Conductor DC resistance check	Verified at 20 °C per ASTM B355 Class 27 (27% NiCu) limits	Every spool
Sample tests
UL VW-1 vertical flame test	Non-propagating inorganic mica-glass flame test per UL 1581 VW-1	Production lot
450 °C thermal endurance & mandrel bend test	Dielectric withstand after 450 °C oven aging and mandrel flexing	Production lot

Inspection certificate

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

Product approvals

Type MG & UL 5107CE · LVDRoHS · REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX · E-file UL AWM STYLE 5107 · [AWG] · 450°C · 600V · TYPE MG

Delivery form: Spools, reels and pre-cut heater harness leads
Lengths: Standard spool lengths and custom cut-and-terminated assemblies
Certificate: EN 10204 3.1 inspection certificate with every dispatch
Quote response: Engineering specification and quote within 2 business hours

Technical documents

Downloads

PDFMica Glass High-Temperature Wire (Type MG & UL AWM Style 5107) – technical datasheet12 sizes · construction, technical data, approvals XLSXType MG / UL 5107 Mica-Glass spec data (Excel)All 12 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.

What is the difference between Type MG and UL AWM Style 5107?

Both use a 27% nickel-clad copper (or pure nickel) conductor insulated with helically lapped mica tapes and an outer treated fiberglass braid rated for 600 V and 450 °C. Type MG is the traditional North American furnace/heater lead designation, whereas UL AWM Style 5107 is the formal UL 758 Appliance Wiring Material component recognition.

Why is 27% nickel-clad copper required instead of tinned or silver-plated copper at 450 °C?

Tin coatings melt near 232 °C and silver-plated copper oxidizes above 200–260 °C. A heavy 27% metallurgical nickel cladding (ASTM B355 Class 27) prevents copper scaling and progressive contact resistance rise during continuous 450 °C operation.

Why can mica-glass wire emit slight smoke during its very first heating cycle above 250 °C?

The outer fiberglass braid is finished with a high-temperature organic saturant binder to prevent fraying during cutting and stripping. On the first excursion above 250–300 °C, trace binder volatiles bake out while the inorganic E-glass and mica dielectric remain intact.

Can Type MG / UL 5107 be used in wet or washdown locations?

No. Braided mica-tape insulation is a breathable dry-heat dielectric system. For wet, condensing or chemical washdown service up to +250/+300 °C, select melt-extruded PFA (UL 11905) or FEP hook-up wire.

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Mica Glass High Temperature Wire

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