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Product

High-temperature wires & cablesUL 66 SF-2 / SFF-2CSA SEW-2 / SEWF-2600 V · 150 / 200 °C

Silicone Fiberglass Fixture Wire (UL SF-2 / SFF-2 & CSA SEW-2)600 V 150 °C / 200 °C silicone-insulated fiberglass-braided luminaire & oven wire

Dual-certified 600 V high-temperature fixture and equipment wire to UL 66 (Types SF-2 200 °C & SFF-2 150 °C) and CSA C22.2 No. 49 (SEW-2 & SEWF-2), combining tinned copper conductors, extruded silicone rubber and a treated fiberglass braid.

Flame-retardant
Outdoor & humid
Approved
Order designation
SF-2 / SEW-2 · 16 AWG
Nominal OD
3.39 mm
SiR wall
0.76 mm
Mass ≈
19.2 kg/km
Max. DC res.
13.7 Ω/km
Check against my drumAll sizes (9)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Temp. rating
150 / 200 °C
200 °C (SF-2/SEW-2) · 150 °C (SFF-2)
Rated voltage
600 V RMS
UL 66 & CSA C22.2 No. 49
Insulation
SiR + FG Braid
Silicone rubber + E-glass braid
AWG range
18–10 AWG
18–10 AWG (SF-2) · 18–12 (SFF-2)
Flammability
UL / CSA FT1
UL Vertical Flame & CSA FT1
Min. bend radius
6 × OD
Fixed internal routing

Typical values for this cable type, based on UL 66 & CSA C22.2 No. 49 — confirmed in the datasheet and quotation for your order.

Application fit

Is SF-2 / SFF-2 / SEW-2 / SEWF-2 right for your machine?

Silicone rubber core with protective fibreglass outer braid (-60 °C to +200 °C) for industrial ovens, drying tunnels, foundry lamps and heating elements.

Furnace, kiln & high-temp zone

Suitable

Primary duty — curing ovens, baking tunnels, infrared heaters and hot industrial luminaires up to +200 °C.

Switchgear & control cabinet wiring

Suitable

Protected internal wiring in heating appliances, furnace control boxes and thermal machinery.

Motor stator, traction & converter leads

Suitable

Glass braid resists hot surface contact on motor housings, transformers and resistor banks.

Immersion & wet locations

Not suitable

Fibreglass braid is for dry/damp indoor heat zones, not continuous water immersion.

Use Silicone Multicore

Trailing & towing

Not suitable

Not designed for floor dragging or mobile reeling under tensile load.

Use NSSHÖU Heavy Rubber
Typical machinesHigh-bay, floodlight & theatrical luminairesCommercial ovens, ranges & food warmersIndustrial drying & curing cabinetsMedical & laboratory autoclavesFurnace & boiler control enclosuresEnvironmental test chambers

Construction

Layer by layer

A soft annealed tinned copper conductor—solid or 7-strand concentric on 200 °C SF-2 / SEW-2 (18–10 AWG) or fine flexible bunched stranding on 150 °C SFF-2 / SEWF-2 (18–12 AWG)—is insulated with vulcanized silicone rubber (0.76 mm or 1.14 mm wall) and covered with a fray-resistant treated fiberglass braid.

123
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Tinned annealed copper conductorASTM B33 tinned copper: solid or 7-strand (SF-2 / SEW-2, 18–10 AWG) or flexible stranded (SFF-2 / SEWF-2, 18–12 AWG)UL 66 & CSA C22.2 No. 49
2Extruded silicone rubber insulationVulcanized high-temperature silicone rubber, 0.76 mm (18–14 AWG) or 1.14 mm (12–10 AWG) nominal radial wallUL 66 & CSA C22.2 No. 49
3Treated E-glass fiberglass outer braidClosely woven fiberglass braid (0.20–0.25 mm) finished with high-temperature moisture- and fray-resistant saturantUL 66 & CSA C22.2 No. 49

UL Type SF-2 & CSA Type SEW-2 · 18 to 10 AWG (200 °C)

600 V · 200 °C · Solid or 7-strand tinned copper + extruded silicone rubber + treated fiberglass braid for fixed fixture/oven wiring

UL Type SFF-2 & CSA Type SEWF-2 · 18 to 12 AWG (150 °C Flexible)

600 V · 150 °C · Flexible bunched tinned copper (16 to 65 strands) + extruded silicone rubber + treated fiberglass braid

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on UL 66 & CSA C22.2 No. 49. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage
600 V RMS across UL Types SF-2, SFF-2 and CSA Types SEW-2, SEWF-2
Dielectric & spark test
2.0 kV RMS AC dielectric test + 6.0 kV Vac in-line spark test per UL 66 / CSA C22.2 No. 49
Conductor stranding & finish
Soft annealed tinned copper per ASTM B33: solid or 7-strand on SF-2 / SEW-2 (18–10 AWG); flexible bunched stranding on SFF-2 / SEWF-2 (18–12 AWG)

Thermal

Operating temperature range
−60 °C to +200 °C continuous for SF-2 & SEW-2 · −60 °C to +150 °C for flexible SFF-2 & SEWF-2
Thermal aging resilience
Cross-linked silicone core remains supple after prolonged 200 °C luminaire and oven cycling

Mechanical

Silicone wall & braid thickness
0.030 in (0.76 mm) extruded silicone wall on 18–14 AWG · 0.045 in (1.14 mm) on 12–10 AWG, plus 0.20–0.25 mm treated fiberglass braid
Minimum bending radius
6 × OD

Resistance

Flammability & cut-through protection
UL 66 horizontal/vertical flame retardant & CSA FT1; glass braid prevents cut-through on hot sheet-metal reflectors
Ozone, UV & halogen status
Halogen-free silicone rubber core resistant to ozone, UV and thermal shock

Reference standards

Applicable standards
UL 66 (Types SF-2 & SFF-2); CSA C22.2 No. 49 (Types SEW-2 & SEWF-2); NEC Article 402; CEC Part I
Environmental compliance
RoHS & REACH compliant

Identification

Available UL & CSA types
Dual-rated SF-2 / SEW-2 (200 °C, 18–10 AWG) and SFF-2 / SEWF-2 (150 °C flexible, 18–12 AWG)
Standard braid colours
White (standard), Black, Red, Blue, Yellow, Brown, Orange, Green/Yellow & tracer combinations

Sizes

9 standard configurations across UL SF-2 / CSA SEW-2 (200 °C) & UL SFF-2 / CSA SEWF-2 (150 °C Flex)

Nominal conductor stranding, silicone insulation thickness, fiberglass braid wall, overall diameter, mass and max DC resistance at 20 °C.

Dimensions, stranding & electrical
Type · AWG sizeTemp.
rating		Size
AWG		CSA ≈
mm²		Stranding
(count/AWG)		Cond. Ø
mm		SiR wall
mm		Braid
mm		Nominal OD
mm		Mass ≈
kg/km		Max. DC res. (20 °C)
Ω/km		Enquiry
UL Type SF-2 / CSA Type SEW-2 · 600 V · 200 °C · 7-Strand Tinned Copper (18–10 AWG)
SF-2 / SEW-2 · 18 AWG200 °C18 AWG0.827/261.170.760.203.0914.521.9
SF-2 / SEW-2 · 16 AWG200 °C16 AWG1.317/241.470.760.203.3919.213.7
SF-2 / SEW-2 · 14 AWG200 °C14 AWG2.087/221.850.760.203.7727.08.6
SF-2 / SEW-2 · 12 AWG200 °C12 AWG3.3119/252.361.140.255.1446.55.4
SF-2 / SEW-2 · 10 AWG200 °C10 AWG5.2619/222.971.140.255.7566.83.4
UL Type SFF-2 / CSA Type SEWF-2 · 600 V · 150 °C · Flexible Stranded Tinned Copper (18–12 AWG)
SFF-2 / SEWF-2 · 18 AWG150 °C Flex18 AWG0.8216/301.220.760.203.1414.822.4
SFF-2 / SEWF-2 · 16 AWG150 °C Flex16 AWG1.3126/301.500.760.203.4219.614.0
SFF-2 / SEWF-2 · 14 AWG150 °C Flex14 AWG2.0841/301.880.760.203.8027.58.9
SFF-2 / SEWF-2 · 12 AWG150 °C Flex12 AWG3.3165/302.361.140.255.1447.25.6
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Solid conductor constructions (18–10 AWG) are also available under UL Type SF-2 and CSA Type SEW-2.

Reel check

Will it fit your machine?

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

Check results

Enter your drum core diameterMinimum for this size is about 40 mm
Minimum bending radius
20 mm
Min. drum core diameter
≈ 40 mm
Cable weight on drum
1.9 kg
Outer diameter
3.4 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.

  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
AC dielectric & in-line spark test2.0 kV Vac dielectric withstand and 100% 6.0 kV spark test per UL 66 & CSA C22.2 No. 49Every spool
Conductor DC resistance checkVerified at 20 °C per ASTM B33 tinned copper limitsEvery spool
Sample tests
UL vertical flame & CSA FT1 testSelf-extinguishing silicone-glass flame test per UL 66 and CSA C22.2 No. 49 FT1Production lot
200 °C heat aging & cold bend testElongation retention after oven aging and −60 °C cold mandrel bendProduction lot

Inspection certificate

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

Product approvals

UL 66 SF-2 / SFF-2CE · LVDRoHS · REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX · E-file UL TYPE SF-2 200°C (or SFF-2 150°C) 600V · CSA SEW-2 (or SEWF-2) FT1
Delivery form
Spools, reels, barrel packs and cut-and-stripped luminaire leads
Lengths
Standard spool lengths and custom OEM harness kits
Certificate
EN 10204 3.1 inspection certificate with every dispatch
Quote response
Engineering specification and quote within 2 business hours

Technical documents

Downloads

PDFSilicone Fiberglass Fixture Wire (UL SF-2 / SFF-2 & CSA SEW-2) – technical datasheet9 sizes · construction, technical data, approvalsXLSXSF-2 / SFF-2 / SEW-2 / SEWF-2 spec data (Excel)All 9 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 SF-2 / SEW-2 and SFF-2 / SEWF-2?
Under UL 66 and CSA C22.2 No. 49, SF-2 and SEW-2 use solid or 7-strand tinned copper conductors (18–10 AWG) rated for 200 °C continuous operation. SFF-2 and SEWF-2 use fine flexible bunched stranding (16 to 65 strands in 18–12 AWG) for movable fixture arms or hinged doors and carry a 150 °C rating under the fixture-wire standard.
How does Type SF-2 differ from Type SF-1?
Type SF-1 is restricted to 18 AWG with a thin 0.015 in (0.38 mm) silicone wall rated at 300 V, whereas Type SF-2 has a 0.030 in (0.76 mm) or 0.045 in (1.14 mm) silicone wall rated for full 600 V service from 18 AWG to 10 AWG.
Why is an outer fiberglass braid used over the extruded silicone rubber?
While vulcanized silicone rubber provides excellent 200 °C dielectric and moisture isolation, it is an elastomer that can be nicked by sharp sheet-metal knockouts or reflector edges inside lighting fixtures and ovens. The saturant-treated E-glass braid adds tough cut-through and abrasion protection.
When should I choose SRML / UL 3231 instead of SF-2 / SFF-2?
Choose Silicone Rubber Motor Lead Wire (SRML / UL 3231) when you need heavy power sizes larger than 10 AWG (up to 4/0 AWG or 500 kcmil), full 200 °C rating with fine rope-lay flexible stranding, or varnish-bake compatibility on motor stators.

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Silicone Fiberglass Fixture Wire

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Reel & motion:
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