UL 5107 450°C Mica Glass Wire for Extreme-Heat Equipment
UL AWM Style 5107 is a mica-and-glass-braid insulation system used for internal wiring inside equipment where operating temperatures exceed what standard hook-up wire, silicone wire, or many general high-temperature constructions are built to handle. This page focuses on the qualified 450°C configuration of Style 5107, rated 600 Vac, using mica tape with a treated glass braid. It is selected specifically where furnace, heater, kiln, or other thermal-processing equipment routes fixed internal wiring through a genuinely high-temperature zone — not as a general-purpose alternative to lower-temperature AWM Styles.
The Confirmed UL 5107 Construction
| Parameter | UL 5107 |
|---|---|
| UL AWM Style | 5107 |
| Description | Single or multiple conductor with other-than-extruded insulation |
| Temperature Rating | 200°C or 450°C, depending on the qualified construction — this page: 450°C |
| Voltage Rating | 600 Vac |
| Conductor Size Range | 26 AWG – 550 kcmil; solid or stranded for 26–8 AWG, stranded only above 8 AWG |
| Insulation | Mica tape with braid, or mica composite with braid |
| Braid Finish | Treated glass braid — silicone varnish or TFE finish |
| UL-Defined Use | Internal wiring of high-temperature equipment where not subjected to repeated flexing and protected from mechanical abuse; acceptability, including current-carrying capacity, determined by applicable UL evaluation |
Mica Tape and Treated Glass Braid — Not a Silicone or Fluoropolymer Construction
UL 5107’s insulation system is mica tape (or a qualified mica-composite construction) with a treated glass braid — not extruded silicone rubber, FEP, PTFE, or PFA. The treated glass braid may carry a silicone varnish or TFE finish depending on the qualified construction; this is a braid treatment, not the primary insulation material. This page does not describe UL 5107 as a silicone-jacketed, fluoropolymer-insulated, PVC, or XLPE product — the mica-and-glass-braid system is the defining construction for this Style.
Mica and Braid Thickness by Conductor Size
UL 5107’s mica tape and treated glass braid thickness requirements change by conductor size group:
| Conductor Size | Mica Tape (min. avg.) | Treated Glass Braid (min. avg.) |
|---|---|---|
| 26–12 AWG | 25 mils | 7 mils |
| 11–4 AWG | 30 mils | 15 mils |
| 3 AWG–4/0 AWG | 35 mils | 20 mils |
| 250–550 kcmil | 40 mils | 20 mils |
These are per-conductor construction thickness requirements — this page does not convert them into an invented finished cable outside diameter. Conductor material, plating, and construction details remain order-specific and should be confirmed for the ordered construction.
Not Subjected to Repeated Flexing — Protected from Mechanical Abuse
This restriction is central to how UL 5107 must be installed. The confirmed UL Use states that this construction is for internal wiring of high-temperature equipment where the wire is not subjected to repeated flexing and is protected from mechanical abuse. This page does not describe UL 5107 as flexible, high-flex, continuous-flex, or suitable for moving or drag-chain applications, and does not publish a bend radius or flex-cycle rating, since none of these are established by the Style-level record. Installation should route the wire along a fixed path, secured so that it is not subject to repeated bending or flexing in service, and positioned so it remains protected from mechanical damage during handling, installation, and servicing of the equipment.
Optional Multiple-Conductor Assembly
Where required, two or more insulated conductors may optionally be cabled together, with a maximum assembly outside diameter of 1.500 inches. A mica glass binder and/or fiberglass fillers, and an optional overall treated glass braid, may be added to a multi-conductor assembly. These are optional provisions within the Style — this page does not present a multi-conductor assembly, binder, fillers, or overall braid as mandatory construction features of every UL 5107 product; the base construction is a single insulated conductor, with multi-conductor assembly available where the project specifically requires it.
Current-Carrying Capacity Is Not Defined by This Product Page
The confirmed UL 5107 Use statement explicitly refers to acceptability, including current-carrying capacity, being determined by the applicable UL evaluation. This page does not publish an ampacity figure, current rating, wattage, maximum heater power, conductor resistance, or allowable load for any conductor size — these must be evaluated for the actual equipment design, installation conditions, and applicable UL determination rather than read from a generic table on this page.
Furnace, Heater, and Thermal-Equipment Internal Wiring
The confirmed UL 5107 use is internal wiring of high-temperature equipment under the conditions described above. Realistic commercial contexts for this construction include furnace internal wiring, heater and burner internal lead routing, kiln internal connections, thermal-processing equipment internal circuits, and OEM assemblies where a mica-based construction is specified. Equipment examples are mentioned only as possible contexts where the fixed, protected, mica-and-braid construction is appropriate — this page does not describe UL 5107 as a resistance heating element, heater coil, or heating cable; it is internal wiring, not a heat-generating component.
What UL 5107 Does Not Automatically Define
The Style data does not automatically define: conductor material, conductor plating, strand count, strand diameter, conductor resistance, ampacity, finished OD, bend radius, flexibility class, flex cycles, standard colour, MOQ, lead time, stock, standard reel length, or production capacity. These are order-level or design-level details that must be confirmed separately — none of them are invented on this page.
RFQ Checklist for UL 5107 450°C 600V Mica Glass Wire
To request an accurate quotation, please specify:
- UL AWM Style 5107
- 450°C or 200°C construction required
- Conductor size
- Solid or stranded requirement, where applicable
- Conductor material / plating, if specified
- Single or multiple conductor configuration
- Required colour or identification
- Finished OD limit, if controlled
- Fixed installation condition
- Mechanical-protection condition
- Furnace / heater / thermal equipment application
- Expected operating temperature
- Quantity
- Reel or cut-length requirement
- Destination
- Documentation requirement
Applicable RoHS / REACH documentation can be confirmed according to the ordered construction.
See our AWM Wire category, our Mica Tape Wire range, or the UL 5107 Mica Wire Style category for other conductor sizes and configurations within this Style.
