UL AWM Style 1659 is a single conductor with extruded insulation, defined under UL Subject 758, Section 1. The insulation material is PTFE/TFE, and the Style is rated 250°C and 600 Vac across a conductor range of 26 AWG to 4/0 AWG in solid or stranded round construction. The stated use is internal wiring.
Two features distinguish this Style within the fluoropolymer range. The insulation thickness steps across three AWG groups rather than remaining constant, so finished dimensions change noticeably at the group boundaries. And the Style file lists four optional elements — a mica tape wrap, a treated glass braid, an Oil Resistant 80°C rating and a Gasoline Resistant rating — none of which is a default characteristic. Each has to be specified and confirmed for the ordered construction.
UL 1659 Ratings and Construction
| UL AWM Style | 1659 |
| Construction | Single conductor with extruded insulation |
| UL Subject / Section | 758, Section 1 |
| Temperature rating | 250°C |
| Voltage rating | 600 Vac |
| Conductor range | 26 AWG – 4/0 AWG, solid or stranded round |
| Insulation material | PTFE / TFE |
| Optional covering | Mica tape wrap |
| Optional braid | Treated glass braid |
| Optional ratings | Oil Resistant 80°C; Gasoline Resistant |
| Flame rating | Horizontal Flame per the UL Style file; VW-1 vertical flame testing available by confirmed construction and agreed order requirement |
| Marking | General, per UL Subject 758 marking requirements |
| Use per UL Style file | Internal wiring |
Insulation Thickness by AWG Range
| AWG range | Minimum average | Minimum at any point |
|---|---|---|
| 26–10 AWG | 20 mils | 18 mils |
| 8–2 AWG | 30 mils | 27 mils |
| 1–4/0 AWG | 45 mils | 40 mils |
These are the only fixed dimensional values in the Style. Where an order spans a group boundary — 10 AWG and 8 AWG, for example — expect a step change in finished outside diameter and check it against the routing and termination hardware in the assembly.
Available UL 1659 Order Options
The UL Style range is 26 AWG through 4/0 AWG in solid or stranded round construction. Both conductor forms are within scope across the full range.
The Style file does not define a conductor material, plating, strand count or conductor resistance. Those are established for the specific ordered construction, together with insulation colour, finished outside diameter, reel length, wire marking and packaging format. The optional elements — mica tape wrap, treated glass braid, Oil Resistant 80°C rating and Gasoline Resistant rating — must each be specified separately at enquiry; they are not applied by default and are available only where supported by the applicable ordered construction.
Where a requested combination of AWG, conductor construction, optional covering and optional rating has not previously been produced, confirm feasibility during enquiry rather than assuming availability from the Style scope alone.
Internal Wiring Applications
The UL Style 1659 file states the use as internal wiring. That is the boundary within which this product is supplied and should be specified.
Within that scope, UL 1659 is typically considered for internal wiring in equipment where the internal operating temperature at the wire location is a design factor, subject to the actual equipment design and order confirmation. Whether a specific construction is suitable for a given installation depends on the equipment, the internal routing arrangement, the ordered construction and the applicable equipment-level evaluation — not on the Style rating alone.
This Style is not supplied or positioned for building wiring, field wiring, general power cable, direct heating-element leads, direct flame exposure, open furnace routing or outdoor wiring. Chemical exposure conditions require the applicable optional rating to be confirmed for the ordered construction rather than assumed from the insulation material.
Optional Oil and Gasoline Resistance
The Style file lists Oil Resistant 80°C and Gasoline Resistant as optional ratings. They are not characteristics of all UL 1659 wire, and they are separate from the optional mica tape wrap and treated glass braid constructions — specifying one does not carry the other.
Where either optional rating is required, the ordered construction, the applicable optional rating, the actual product marking and any required test or supporting documentation must all be confirmed during quotation. Do not assume the rating applies to a construction unless it has been confirmed for that specific order.
UL Marking and Order Documentation
The ordered construction, the applicable certified scope, the actual UL marking applied and the supporting documents must all be confirmed before production. Only products bearing the applicable UL Mark should be represented as covered products.
Where UL, RoHS, REACH, oil-resistance, gasoline-resistance or other documents are required, specify them during enquiry so availability can be confirmed for the ordered construction. Minimum order quantity, sample availability, reel length, packaging, delivery schedule and marking are confirmed in the quotation rather than fixed in advance.
Related Fluoropolymer Wire Products
For the full range of UL 1659 constructions, see the UL 1659 PTFE wire category. Two other fluoropolymer Styles are available: UL 1332 (200°C / 300 Vac, extruded FEP, 30–10 AWG) and UL 10362 (250°C / 600 Vac, extruded PFA, 30 AWG–4/0 AWG). Selection between them should follow the insulation material, ratings and conductor range required by the equipment design.
The wider ranges are available under Fluoropolymer Wire and AWM Wire.
Request a UL 1659 Wire Quote
Send the following with your enquiry so the construction can be confirmed against the applicable certified scope:
- AWG size
- Solid or stranded round requirement
- Requested conductor material and plating
- Detailed stranding requirement
- Required finished outside diameter
- Colour
- Mica tape wrap requirement
- Treated glass braid requirement
- Oil-resistant or gasoline-resistant rating requirement
- Quantity
- Reel or cut length
- Packaging format
- Equipment type
- Internal routing condition
- Actual temperature requirement at the wire location
- Voltage requirement
- Required wire marking
- Required order documents
