UL 5128 Multi-Core Mica Glass Braid Cable Overview
This page covers UL AWM Style 5128 mica tape and treated glass braid insulated cable in a multiple-conductor construction, supplied by CableApex as a factory-direct manufacturer. UL Style 5128 covers a conductor range of 24 AWG through 4 AWG and permits two or more qualifying insulated conductors to be cabled together into a multiple-conductor assembly. This page’s primary focus is that multi-conductor construction; buyers requiring a single-conductor UL 5128 construction should confirm that requirement separately during quotation.
UL 5128 multi-core mica glass braid cable is a non-extruded insulation construction, rated 450°C and 300 Vac, built from non-extruded mica tape or mica composite with a treated glass braid, for internal wiring of high-temperature equipment. Core count, conductor material and finish, braid treatment, and packaging are confirmed according to the ordered specification.
450°C / 300 Vac UL Style 5128 Rating
| Parameter | UL Style 5128 |
|---|---|
| Construction | Single or multiple conductor with other-than-extruded insulation |
| Rated Temperature (Maximum) | 450°C |
| Voltage Rating | 300 Vac |
| Flame Rating | Horizontal flame; VW-1 vertical flame test available |
| Conductor Size Range (Style) | 24 AWG – 4 AWG, solid or stranded |
| Insulation | Non-extruded mica tape, or mica composite per qualified construction |
| Braid Finish | Treated glass braid — silicone varnish finish or TFE finish |
| Optional Braid | Stainless steel alloy 304, over the treated glass braid (order-specific) |
| Assembly | Two or more insulated conductors may be cabled together; max. assembly OD 1.500 in. |
| Optional Assembly Materials | Mica glass binder, fiberglass fillers, overall treated glass braid |
| Marking | General — company name, model designation and UL Recognized Component Mark — file on record |
| Use per UL Style file | Internal wiring of high-temperature equipment where not subjected to repeated flexing and protected from mechanical abuse |
| RoHS / REACH | Confirmed during quotation according to ordered materials and documentation requirements |
Mica Tape and Treated Glass Braid Construction
Each conductor in a UL 5128 assembly is insulated with non-extruded mica tape or mica composite, covered by a treated glass braid. The braid may carry a silicone varnish finish or a TFE finish, depending on the qualified construction — this is a braid treatment, not a silicone rubber or PTFE primary insulation. This product should not be described as a silicone rubber, PTFE, FEP, neoprene, EPDM, PVC, or XLPE cable. The mica-and-glass-braid system is the defining insulation construction for this Style.
UL 5128 Construction by AWG Range
| Conductor Size | Mica Tape (min. avg.) | Treated Glass Braid (min. avg.) |
|---|---|---|
| 24–12 AWG | 15 mil | 7 mil |
| 11–4 AWG | 20 mil | 15 mil |
These are per-conductor construction thickness requirements and do not translate into an invented finished conductor or cable outside diameter. Conductor material, plating, strand count, and resistance are not established by the Style-level record and are confirmed according to your ordered specification.
Multiple-Conductor Cable Assembly
Two or More Insulated Conductors
UL Style 5128 permits two or more qualifying insulated conductors to be cabled together into a multiple-conductor assembly, with a maximum assembly outside diameter of 1.500 inches. This 1.500-inch figure is the maximum permitted OD for the assembly, not a standard or typical OD — actual finished assembly diameter depends on core count, conductor size, and construction, and is confirmed for the ordered configuration. Core count itself is not fixed by the Style and must be specified and confirmed according to your required assembly; this page does not present fixed 2-core, 3-core, 4-core, or other preset specifications.
Optional Binder, Fiberglass Fillers and Overall Glass Braid
The Style permits optional construction features for a multi-conductor assembly: a mica glass binder, fiberglass fillers, and an overall treated glass braid applied over the completed assembly. These are optional, order-specific features rather than standard components of every UL 5128 multi-core cable — specify which, if any, are required when requesting a quotation.
Optional Stainless Steel 304 Braid
UL Style 5128 permits an optional stainless steel alloy 304 braid applied over the treated glass braid. This is an order-specific feature, not a default component of every 5128 construction. We do not publish abrasion-cycle counts, tensile strength, braid coverage percentage, crush resistance, or EMI shielding effectiveness for this optional braid, as none of these are established by the Style-level record. If your application requires this optional braid, specify it when requesting a quotation.
High-Temperature Equipment Internal Wiring
UL Style 5128 is designated for internal wiring of high-temperature equipment. This is the application boundary for the product supplied from this page: protected internal wiring of high-temperature equipment, and fixed multi-conductor internal connections. It is not intended as field wiring, building wiring, branch circuit cable, tray cable, outdoor or direct-burial cable, or general machinery power cable, and this page does not position the product for welding leads, battery leads, EV charging, solar PV, marine, automotive, or robotic-motion applications.
Repeated Flexing and Mechanical Protection Limitations
The UL Style use statement specifies that this cable is not subjected to repeated flexing and must be protected from mechanical abuse. UL 5128 is not described on this page as flexible, extra-flexible, high-flex, continuous-flex, or a drag-chain or robotics cable — those characteristics fall outside its UL-supported use. This product is also not positioned for exposed floor use, abrasion against steel edges, workshop dragging, or exposed outdoor routing, as these conflict with the mechanical-protection requirement. We do not publish a bending radius, as none is confirmed by the supplied UL record. Installation should route and secure the assembly along a fixed or protected path.
UL Marking and Documentation
Qualifying UL AWM Style 5128 constructions can be supplied through the relevant partner manufacturing scope associated with the applicable UL Recognized Component file on record. UL marking and related documentation depend on the specific qualified construction ordered; not every configuration automatically carries a UL Mark, and marking requirements should be confirmed when requesting a quotation. Current-carrying capacity for a given construction is subject to the applicable UL determination based on the actual conductor size, assembly, and installation conditions — this page does not publish a generic ampacity table. We do not guarantee that a given shipment will pass a customer’s internal or third-party audit, certification review, or project bidding requirement.
RoHS and REACH are separate regulatory frameworks from UL recognition and are not treated as equivalent certifications on this page. Applicable RoHS / REACH documentation, where required, is confirmed according to the ordered materials and your documentation requirements.
Ordering UL 5128 Multi-Core Cable
To provide an accurate quotation for UL 5128 multi-core mica glass braid cable, please specify:
- Required AWG size within the 24–4 AWG Style range
- Solid or stranded conductor requirement
- Conductor material and finish requirement
- Number of conductors (core count)
- Mica tape or applicable mica composite construction
- Treated glass braid finish — silicone varnish or TFE
- Optional stainless steel 304 braid, if needed
- Optional mica-glass binder or fiberglass fillers, if needed
- Optional overall treated glass braid, if needed
- Order quantity
- Packaging requirement
- UL marking requirement, if applicable
- Documentation requirements, including RoHS / REACH if needed
- Shipping destination
Send this information and we respond with a quotation within 12 business hours. Production lead time depends on the confirmed construction and order quantity, and shipping options and applicable Incoterms are confirmed during quotation according to destination.
This construction supports our Multi-core Cable range. For other constructions within this Style, see our UL 5128 Mica Wire category.
