Electrical Fish Paper Sheet & Roll | Vulcanized Fibre Insulation - STK
STK's Electrical Fish Paper (also widely recognized as electrical-grade Vulcanized Fibre) is a dense, rugged, and highly reliable dielectric material. Manufactured by chemically processing pure cellulose, this unique material blends the lightweight flexibility of heavy paper with the exceptional mechanical durability and high dielectric integrity of engineered plastics.
Available in both continuous rolls and flat sheets, our fish paper is engineered specifically to withstand extreme physical and electrical stress. It is the premier choice for electrical insulation systems requiring high resistance to tearing, puncturing, and mechanical friction, maintaining its structural integrity even when bent or formed into tight, permanent channels.
Technical Specifications
| Property | Value (Metric) | Value (Imperial) | Test Method / Compliance |
|---|---|---|---|
| Material Composition | 100% Vulcanized Cellulose Fibre | - | Electrical Grade |
| Thickness Range | 0.1 mm - 0.5 mm | 4 mil - 20 mil | Custom calipers available |
| Dielectric Strength | ≥ 11 kV/mm | ≥ 280 V/mil | ASTM D-149 |
| Tensile Strength (MD) | ≥ 85 MPa | - | High-Tension Resistant |
| Insulation Class | Class A (105°C) | Class A (221°F) | Continuous Running |
| Color Options | Dark Gray / Blue-Gray / Green | - | Industry Standard |
Key Features
Excellent Electrical Insulation Performance
Provides reliable dielectric insulation for transformers, motors, capacitors, and electrical assemblies.
01
High Mechanical Strength & Flexibility
Durable fiber structure resists tearing and abrasion while remaining flexible for wrapping and forming applications.
02
Good Heat & Oil Resistance
Suitable for electrical environments exposed to transformer oil, heat, and industrial operating conditions.
03
Easy Die-Cutting & Processing
Supports precision die-cutting, punching, folding, and lamination for custom insulation components.
04
Cost-Effective Insulation Solution
Compared with advanced insulation materials, fish paper offers economical protection for general electrical insulation applications.
05
Alternatives / Comparison
Brand Alternatives
Comparable to: DMD Electrical Insulation Paper
Comparable to: Nomex Insulation Paper
Comparable to: Vulcanized Fiber Insulation Sheet
Comparison Logic
Used for electrical insulation barriers and protection
Similar applications in transformers, motors, and electrical equipment
Provides dielectric insulation and mechanical protection
Cost-Effective Alternatives
Factory direct insulation paper solutions provide:
Cost savings of approximately 20%–50%
Custom sheet sizes and roll formats
Precision die-cutting and slitting services
OEM insulation component manufacturing.
Slot Insulation for Electric Motors & Transformers
In heavy electrical equipment manufacturing, materials must endure continuous physical vibration and thermal cycling. STK's Vulcanized Fibre Fish Paper is optimized to address these specific engineering pain points:
Armature & Stator Slot Insulation
Acts as a tough liner within the metal slots of electric motor stators and rotors, protecting fragile enameled copper magnet wires from snapping or rubbing against sharp laminated steel edges.
01
Transformer Core & Coil Barrier
Serves as a rugged layer insulator between transformer winding sheets, choking out electrical arcs and stabilizing voltage pathways under high loads.
02
Unmatched Mechanical Toughness
Unlike standard synthetic films, fish paper has superior resistance to tear propagation and edge-cracking, allowing it to absorb the mechanical stresses of automated high-tension wire winding machines.
03
Excellent Oil & Solvent Absorption
When used in oil-immersed transformers, it readily absorbs insulating oils without breaking down, augmenting its overall dielectric breakdown resistance.
04
B2B Custom Conversion: Precision Die-Cutting & Scoring
Modern automated electronic and motor assembly lines require drop-in, production-ready components. Sourcing raw rolls and cutting them manually slows down throughput and introduces quality risks. STK directly solves this bottleneck with our in-house conversion ecosystem:
Excellent Punching & Bending Properties
Our fish paper is specially conditioned to support high-speed stamping. It shears cleanly without edge fraying or delamination.
Custom Stamped Gaskets & Insulators
Send us your CAD, DWG, or PDF design blueprints. Using precision flatbed die-cutting machinery, we supply custom-shaped slot liners, insulating washers, spacer shims, and switch barriers built to tolerances of 0.1 mm.
Primary Commercial Application Fields
Electric Motors & Generators
Slot liners, phase insulation, and coil wrapping for industrial electric motors, automotive starters, and generators.
Power & Distribution Transformers
Layer insulation, barrier sheets, and lead wire wrapping.
Lithium Battery Packs
Insulation barriers positioned between cell matrices and exterior metallic cases to prevent grounding faults.
Electrical Switchgear & Lighting
Structural insulating backplates, fuse tubes, and safety barriers inside circuit breaker boxes and commercial lighting ballasts.
Equipment
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