UL 3135 and UL 3071 Silicone Rubber Wire — 200°C / 600V AWM Internal Wiring
UL Style 3135 and UL Style 3071 are the two standard silicone rubber wire constructions within UL Subject 758 AWM for appliance internal wiring at 200°C and 600V. Both use extruded silicone rubber insulation at 30 mils minimum average wall thickness over a copper conductor — the difference between them is the presence or absence of a fiberglass braid outer covering, which determines their applicable use classification and typical application range.
For international buyers familiar with Chinese-designation AGR and AGRP silicone wire, UL 3071 is the UL-recognized equivalent of AGR (with fiberglass braid) and UL 3135 is the equivalent of AGRP (bare silicone rubber insulation). Both styles are manufactured under UL Follow-Up Service and carry the UL Recognized Component Mark on the wire surface.
UL 3071 vs UL 3135 — Construction and Application Comparison
| Property | UL 3071 | UL 3135 |
|---|---|---|
| Voltage Rating | 600 Vac | 600 Vac |
| Temperature Rating | 200°C | 200°C |
| AWG Range | 18 AWG – 13 AWG | 26 AWG – 12 AWG |
| Insulation | Extruded SR — 30 mils min avg / 27 mils min at any point | Extruded SR — 30 mils min avg / 27 mils min at any point |
| Outer Covering | Fiberglass braid (SF-2 equivalent per UL 66) | None — bare silicone rubber insulation |
| UL Use Classification | Internal wiring of appliances | Internal wiring of appliances where totally enclosed |
| Flame Rating | Horizontal flame | Horizontal flame |
| Best For | Motor leads, heating element connections where mechanical protection needed | General appliance internal wiring in totally enclosed enclosures |
| UL Recognition | UL Recognized Component — file on record | UL Recognized Component — file on record |
Technical Specifications
| Parameter | Specification |
|---|---|
| Conductor Material | Tinned or bare copper, solid or stranded |
| Insulation Material | Extruded silicone rubber (SR) |
| Insulation Thickness | 30 mils min average / 27 mils min at any point |
| Temperature Rating | 200°C continuous / –60°C lower limit |
| Voltage Rating | 600 Vac (UL 3071 and UL 3135) |
| Flame Rating | Horizontal flame |
| Color Options | Red, black, white, yellow, blue, green, brown, orange (custom on request) |
| Spool Lengths | 50 m / 100 m / 200 m / custom lengths available |
| MOQ | 100 meters per AWG / color |
Application Categories
Household Appliance Internal Wiring
UL 3135 (bare silicone rubber) is the standard specification for internal wiring of household appliances in totally enclosed enclosures — connections between heating elements and thermostats, motor terminal to control board leads, and any internal wiring run passing through or near heat-generating components. The 200°C rating provides adequate thermal margin above the 85–130°C temperatures typically encountered in appliance hot zones.
Motor Lead Connections
UL 3071 (with fiberglass braid) is the preferred specification for motor lead wiring — the short connection between the motor winding terminal and the motor terminal box — where the fiberglass braid provides mechanical protection during motor assembly handling and the 200°C rating covers Class F (155°C) and Class H (180°C) motor winding thermal environments.
Industrial Heating Equipment
Both UL 3071 and UL 3135 are used for internal wiring of electric heaters, industrial dryers, infrared heating panels, and heat-sealing equipment where internal ambient temperatures reach 100–180°C — above the practical limit of 105°C-grade PVC wire. For applications exceeding 200°C, upgrade to UL 5107 mica-fiberglass wire rated for 450°C.
Commercial Kitchen and Oven Equipment
Convection ovens, commercial fryers, and industrial food processing equipment require 200°C-rated internal wiring for heating element leads and thermostat circuit connections. UL 3135 in the totally enclosed oven cavity and UL 3071 for external motor lead connections cover both zones of the same appliance under a single UL AWM style family.
Selecting Between UL 3071 and UL 3135
The selection between these two styles comes down to three factors: AWG range, mechanical environment, and enclosure type. If your AWG requirement falls between 18–13 AWG and the wire routing path involves mechanical contact with enclosure edges or handling during assembly, specify UL 3071 with fiberglass braid. If your AWG requirement falls between 26–12 AWG in a totally enclosed appliance enclosure with static wire routing, specify UL 3135 bare silicone rubber. For applications requiring silicone rubber wire with glass or aramid braid covering in a wider AWG range, consider UL 3172 (200°C / 600V, 26–18 AWG with glass or aramid braid).
Related UL Styles for Comparison
UL 3135 and UL 3071 buyers commonly cross-reference: UL 3172 (200°C / 600V silicone rubber with glass or aramid braid, 26–18 AWG), UL 3122 (200°C / 300V silicone rubber with fiberglass braid, 26–16 AWG), UL 5107 (200–450°C / 600V mica-fiberglass, for applications exceeding 200°C), and UL 1015 (80–105°C / 600V PVC, for standard-temperature appliance internal wiring below 105°C).
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Submit your UL Style (3071 or 3135), AWG, conductor type, color, spool length, and annual volume estimate below. Our team responds within 24 business hours. Free 10-meter samples available upon request.
