UL 5128 18 AWG Mica Glass Braid Wire Overview
This page covers UL AWM Style 5128 mica tape and treated glass braid insulated wire in an 18 AWG construction, supplied by CableApex as a factory-direct manufacturer. UL Style 5128 covers a conductor range of 24 AWG through 4 AWG, solid or stranded; this page focuses specifically on the 18 AWG construction. Buyers requiring a different gauge within the Style range should confirm their specific size during quotation.
UL 5128 18 AWG mica glass braid wire 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. Conductor construction 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, 15 mil min. average total tape layers (24–12 AWG range) |
| Shield / Covering | Glass braid treated with silicone varnish or TFE finish, 7 mil min. average (24–12 AWG range) |
| Optional Braid | Stainless steel alloy 304, applied over the treated glass braid (order-specific, not default) |
| 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 |
18 AWG 15/7 Mil Mica and Treated Glass Braid Construction
This page is built around the 18 AWG conductor size, which falls within UL Style 5128’s 24 AWG–12 AWG construction bracket. At this gauge, the insulation system consists of non-extruded mica tape or mica composite applied at a minimum average total thickness of 15 mil, covered by a treated glass braid at a minimum average thickness of 7 mil. The glass braid is treated with silicone varnish or TFE finish according to the qualified construction. This is a mica-and-glass-braid insulation system — not a silicone rubber, FEP, PFA, PVC, or XLPE polymer-insulated wire. We do not publish a finished outside diameter, conductor diameter, resistance, or current-carrying capacity on this page, as these depend on the actual ordered construction and are subject to the applicable UL determination.
Solid or Stranded Conductor Requirements
At 18 AWG, the conductor can be supplied solid or stranded per the Style scope. Conductor material and finish are not fixed by the UL Style definition and are confirmed according to your ordered specification rather than assumed as a default. We do not state a specific conductor material, plating, copper purity, strand count, or strand diameter. If your application requires a specific conductor construction or finish, specify this when requesting a quotation.
Optional Stainless Steel 304 Braid and Multiple-Conductor Construction
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, and its coverage or abrasion performance is not published on this page unless separately confirmed. The Style also permits two or more qualified insulated conductors to be cabled together, with a maximum assembly outside diameter of 1.500 inches, using a mica glass binder and/or fiberglass fillers, with an optional overall treated glass braid over the assembly. This is mentioned as an order-specific construction capability; this page’s primary focus remains the individual 18 AWG construction.
High-Temperature Equipment Internal Wiring Application Boundary
UL Style 5128 is designated for internal wiring of high-temperature equipment. This wire is internal wiring within such equipment — it is not the heat-generating element itself, and this page does not position it as resistance heating wire, a cartridge heater element, or a direct heater component. Application language on this page is limited to internal wiring of high-temperature equipment as stated in the UL Style file.
Repeated-Flexing and Mechanical-Protection Limitations
The UL Style use statement specifies that this wire is not subjected to repeated flexing and must be protected from mechanical abuse. This is an important installation limitation: UL 5128 is not described on this page as high-flex, ultra-flexible, or continuous-flex wire. Installation should route and secure the wire so it is not subject to repeated bending or flexing in service, and so it remains protected from mechanical damage during handling, installation, and servicing of the equipment.
UL Marking and Documentation Requirements
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. Acceptability of a given construction, including current-carrying capacity, is subject to the applicable UL determination rather than a generic published ampacity figure. 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 18 AWG Mica Wire
To provide an accurate quotation for UL 5128 18 AWG mica glass braid wire, please specify:
- Confirmation of 18 AWG as the required gauge
- Solid or stranded conductor
- Conductor material or finish requirement
- Mica construction requirement
- Silicone-varnish or TFE-finish requirement for the glass braid, where applicable
- Optional stainless steel 304 braid requirement, if needed
- Single- or multiple-conductor requirement
- 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.
For other gauges within this Style, see our UL 5128 Mica Wire category, or browse our broader Mica Wire range to compare constructions.
