UL 3135 Silicone Wire — Selected Stranded Tinned-Copper Construction
This page covers UL AWM Style 3135 silicone rubber wire supplied with a selected stranded tinned-copper conductor construction. Tinned copper is one of the conductor options available within the Style scope — it is not a requirement of UL Style 3135, and the Style file itself does not define a conductor material or plating. Buyers specify it where the assembly process includes soldering steps, extended storage before use, or handling conditions that make conductor surface consistency worth controlling.
UL Style 3135 is rated 200°C at 600 Vac, covering 26 AWG to 12 AWG in solid or stranded construction, with extruded silicone rubber insulation at 30 mils minimum average and 27 mils minimum at any point. The stated use is internal wiring of appliances where totally enclosed. For the general Style overview and other conductor options, see UL 3135 Silicone Wire.
UL AWM Style 3135 — Specifications
| UL AWM Style | 3135 |
| UL Subject / Section | 758, Section 3 |
| Temperature rating | 200°C |
| Voltage rating | 600 Vac |
| Conductor range (Style scope) | 26 AWG – 12 AWG, solid or stranded |
| Conductor (this product) | Selected stranded tinned-copper construction — confirmed at order |
| Insulation | Extruded silicone rubber (SR) |
| Minimum average insulation thickness | 30 mils (0.76 mm) |
| Minimum insulation at any point | 27 mils (0.69 mm) |
| Flame rating | Horizontal flame; VW-1 vertical flame test available |
| Marking | Per UL Subject 758 marking requirements; confirmed for the qualified ordered construction |
| Use per UL Style file | Internal wiring of appliances where totally enclosed |
| RoHS / REACH | Requirements confirmed according to ordered materials and documentation requirements |
Note that the 30 mils minimum average insulation wall applies uniformly across the full 26–12 AWG range under this Style, so finished outer diameter varies with conductor size alone rather than stepping between wall classes.
Why Buyers Specify Tinned Copper
Tinned copper is available for confirmed OEM orders under this Style. It is worth specifying where the production process makes conductor surface condition a practical concern:
- Solder wetting. Tinned conductors typically show easier solder wetting than bare copper in many production processes, which can reduce variation in solder joint formation across a production run.
- Storage and handling. Tin plating helps reduce surface oxidation on the conductor during storage and handling before the wire reaches the assembly stage. This matters more where wire is bought in volume and consumed over an extended period.
- Termination consistency. Where soldering or a particular termination method is used repeatedly across production units, a tinned conductor surface can support more consistent results than a bare surface whose condition varies with age and storage.
Tinned copper is a construction choice rather than a performance guarantee — it does not prevent oxidation entirely, and it is not universally preferable to bare copper. Where the termination method is crimp or screw terminal and the wire is consumed shortly after receipt, bare copper may be equally suitable. Confirm the conductor requirement against your own assembly process at enquiry.
Application Boundary — Totally Enclosed Appliance Internal Wiring
The UL Style 3135 file states the use as internal wiring of appliances where totally enclosed. This condition applies to the finished installation, and it is the boundary within which this product is supplied.
- Protected internal appliance leads routed entirely within the appliance housing
- Internal wiring inside totally enclosed appliance assemblies where a 200°C silicone rubber construction is specified by the equipment design
- Protected internal routing where the appliance enclosure fully contains the wire path
- Internal leads located in warmer zones of the appliance interior, where the wire remains protected inside the enclosure and is not in contact with flame or heating elements
UL Style 3135 is not supplied or positioned as motor cable, control panel wiring, field wiring, building wire, exposed wiring or heating-element connection wire. Suitability for a specific appliance design depends on the equipment, the routing arrangement, the ordered construction and the applicable equipment-level evaluation.
OEM Processing and Harness Production
UL 3135 tinned-copper wire can be supplied for OEM harness production where the finished assembly is used as totally enclosed appliance internal wiring. Where harness production is part of your process, the following are worth settling at enquiry:
- Cut lengths. Fixed-length cutting can be arranged where the assembly uses repeated lead lengths.
- Stripping and termination. Silicone rubber insulation behaves differently from PVC under stripping tooling. Confirm the insulation dimensions so stripper settings can be calibrated to the actual ordered construction.
- Soldering. Where the assembly includes soldering steps, the tinned-copper construction on this page is the relevant option.
- Multiple colours. Harness assemblies typically require several colours for lead identification. Specify the colour list and the quantity per colour.
- Reel or spool format. Confirm the format your assembly line works with, including reel length.
Note that supplying wire for harness production does not change the Style boundary — the finished harness must be installed as totally enclosed appliance internal wiring.
UL Marking and Order Documentation
CableApex supplies UL AWM Style 3135 construction from factory production. UL marking and Style-specific documentation depend on the qualified ordered construction, and both should be confirmed during quotation before production begins. Where RoHS, REACH or other documentation is required, specify the requirement at enquiry so availability can be confirmed for the ordered materials and construction.
Ordering Information
To receive an accurate quotation, confirm the following:
- AWG size or sizes — harness orders commonly cover several
- Conductor construction — solid or stranded
- Tinned-copper requirement
- Colour list and quantity per colour
- Total quantity
- Reel or spool length
- Cut-length requirement, if applicable
- Marking requirement
- Documentation requirement
Related UL AWM Styles
Buyers evaluating this construction may also consider: UL 3135 Silicone Wire for the full Style range and other conductor options; UL 10362 PFA Wire (250°C / 600 Vac, extruded PFA, 30 AWG–4/0 AWG — fluoropolymer alternative at a higher temperature class); and UL 1007 PVC Wire (80°C / 300 Vac, extruded PVC, 32–16 AWG — lower-temperature PVC hook-up wire where 200°C silicone is not required). The wider ranges are available under Silicone Rubber Wire and AWM Wire.
