Formex GK-17 Electrical Insulation Sheet | Flame Retardant Die-Cut Polypropylene - STK
STK's Formex GK-17 Electrical Insulation Sheet is the global industry benchmark for flame-retardant electrical isolation and electronic shielding. Formex GK-17 is a specialized polypropylene material with a nominal thickness of 0.43 mm (17 mil). It is a rigid yet highly flexible engineered plastic sheet designed to serve as a permanent internal physical barrier against electrical arcing and thermal events.
Formex GK-17 is widely recognized for its superior dielectric strength, exceptional physical toughness, and near-zero moisture absorption. Its unique structural composition allows it to be scored, folded, and bent repeatedly into complex three-dimensional shapes without cracking or splitting. This makes it an ideal choice for lining electronic enclosures, separating high-voltage components, and protecting delicate parts within power supplies, EV batteries, and industrial switchgear.
Certified Safety: UL94 V-0 Flame Retardant Performance
In commercial electronics and industrial power distribution, compliance with safety regulations is absolute. STK's Formex GK-17 provides the essential certifications required to pass rigorous safety audits:
Strict UL94 V-0 Flammability Rating
Formex GK-17 features advanced flame-retardant chemistry that ensures it self-extinguishes within seconds in the event of an electrical short, preventing the spread of fire within internal compartments.
01
Exceptional Dielectric Breakdown Protection
Delivering a dielectric strength profile exceeding 22 kV, this 17 mil sheet provides a reliable electrical barrier even in high-power, space-constrained electronic layouts.
02
Excellent Chemical & Moisture Resistance:
Boasting a moisture absorption rate of less than 0.06%, it maintains full electrical integrity and dimensional stability in humid, harsh industrial environments.
03
Non-Conducive Mechanical Durability:
Offers high tear resistance and structural rigidity, acting as a physical shield that prevents sharp wire edges or metallic components from puncturing the insulation barrier.
04
Technical Specifications
| Property | Value (Metric) | Value (Imperial) | Test Method / Compliance |
|---|---|---|---|
| Material Base | Flame-Retardant Polypropylene | - | Formex GK Series |
| Nominal Thickness | 0.43 mm | 17 mil | - |
| Flammability Rating | UL 94 V-0 | UL 94 V-0 | UL Certified |
| Dielectric Strength | ≥ 22,000 Volts | ≥ 22 kV | ASTM D-149 |
| Moisture Absorption | < 0.06% | < 0.06% | ASTM D-570 |
| Temperature Index | 115°C | 239°F | UL 746B (Electrical) |
Precision Die-Cutting & Scoring Services for Custom Insulators
Standard rectangular sheets rarely fit directly into advanced industrial enclosures. At STK Tape, we provide an end-to-end fabrication service to deliver production-ready components directly to your assembly line:
CAD/PDF Custom Die-Cutting:
Send us your technical drawings. Using precise flatbed and rotary die-cutting equipment, we punch Formex GK-17 into intricate custom patterns, windows, and perimeter gaskets with tight tolerances of ±0.1 mm.
Advanced Creasing & Scoring:
We implement specialized creasing techniques that allow the 17 mil material to be shipped flat but easily folded into 3D boxes, shields, or channels by your assembly staff, saving storage space and reducing freight costs.
Optional Adhesive Lamination:
If your design requires the insulation sheet to be permanently anchored inside a metal chassis, we can laminate the back of the Formex sheet with high-performance 3M or STK double-sided acrylic adhesive before die-cutting.
Primary B2B Application Fields
Power Supply Enclosures: Folding insulators used to separate high-voltage primary circuits from low-voltage secondary outputs inside PC, server, and industrial switch-mode power supplies (SMPS).
EV Battery Packs: Barrier sheets placed between cell modules and the outer metal container to prevent cell-to-chassis grounding faults.
Industrial Control Panels: Custom-shaped barriers inside motor control centers, electrical switchgear, and circuit breaker housings.
Equipment
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