UL 5128 Mica Wire
UL 5128 Mica Wire — 450°C · 300V AC · Mica Tape or Mica Composite with Glass Braid
UL AWM Style 5128 is a mica tape or mica composite insulated wire with a glass braid outer covering, rated at 450°C and 300V AC under UL Subject 758, Section 5. The insulation uses non-extruded mica tape wraps — or a mica composite construction per the facing page — with a glass braid treated with silicone varnish or TFE finish as the outer covering. An optional stainless steel alloy 304 braid shield may be applied over the treated glass braid. Both single-conductor and multiple-conductor cabled assemblies are available under this style.
The permitted use is internal wiring of high-temperature equipment where the wire is not subjected to repeated flexing and is protected from mechanical abuse, and where the acceptability — including current-carrying capacity — has been determined by UL. Typical protected internal wiring contexts include high-temperature ovens, kilns, and furnace enclosures where the circuit voltage is within the 300V AC limit. Application suitability is subject to equipment design, routing conditions, mechanical protection, and current-carrying requirements — confirm at enquiry stage.
UL 5128 shares the 450°C temperature class and mica tape / glass braid construction of UL 5107 but is rated 300V AC rather than 600V. For 600V mica wire, see UL 5107. For compact 300V mica wire constructions, see UL 5334. For thin-wall mica wire from 30 AWG, see UL 5359.
Technical Specifications — UL Style 5128
| Parameter | Specification |
|---|---|
| UL AWM Style | 5128 |
| UL Subject | 758, Section 5 |
| Temperature Rating | 450°C maximum |
| Voltage Rating | 300V AC |
| AWG Range | 24 AWG – 4 AWG, solid or stranded |
| Insulation | Non-extruded mica tape or mica composite — per facing page construction |
| Outer Covering | Glass braid treated with silicone varnish or TFE finish |
| Optional Shield | Stainless steel alloy 304 braid over treated glass braid (optional) |
| Conductor | Solid or stranded copper; bare or nickel-plated |
| Assembly | Single conductor or multiple conductors cabled together (max O.D. 1.500 in); optional overall glass braid |
| Flame Rating | Horizontal flame |
| UL Recognition | UL Recognized Component — file on record |
| Permitted Use | Internal wiring of high-temperature equipment — not subjected to repeated flexing, protected from mechanical abuse; acceptability including current-carrying capacity determined by UL |
| RoHS / REACH | Documentation available on request |
Request a Quote
To receive an accurate quotation, please include the following in your enquiry: required temperature rating, voltage rating, AWG size, conductor type (solid / stranded; bare / nickel-plated), single or multiple conductor requirement, optional SS304 shield requirement, glass braid covering specification, colour, quantity (metres or reels), routing condition (protected internal / conduit), equipment type, and end application. Minimum order: 100 m per specification. Response within 12 hours.
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