Secure® 1500 KT2
Secure 1500 KT2 is a double-sided thermal interface adhesive featuring thermally conductive uncured silicone on both sides of a Kapton MT substrate, with a thermal conductivity of 1.5 W/°C·m at 100°C and a dielectric strength of 53.1 kV/mm. The 0.191 mm overall construction delivers the lowest thermal impedance in the Secure family at 0.29 °C·in²/W at 380 psi across an operating range of -101°C to +204°C. UL listed (E54153) with a UL 94 V-0 flame rating and RTI 150°C/150°C for both mechanical and electrical applications.
Key Properties
- Thermal Conductivity: 1.5 W/°C·m @ 100°C (ASTM E1530)
- Thermal Impedance @ 380 psi: 0.29 °C·in²/W (ASTM E1530)
- Dielectric Strength: 53.1 kV/mm (ASTM D149)
- Durometer: 77 Shore A (ASTM D2240)
- Operating Temperature: -101°C to +204°C
- Overall Product Thickness: 0.191 mm
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Overall Product Thickness | 0.191 mm | — |
| Color | Mauve | — |
| Construction Designation | Construction 1 | Code Definitions |
| Specific Gravity | 2.50 | Arlon SQA-TMS-024 |
| Total Product Weight | 0.448 kg/m² | — |
Product Design & Construction
| Property | Value | Test Method |
| Top Interleave / Carrier | 0.038 mm Polyethylene | — |
| Side 1 — Adhesive | 0.064 mm Uncured Silicone | — |
| Substrate | 0.025 mm Kapton® MT | — |
| Side 2 — Adhesive | 0.102 mm Uncured Silicone | — |
| Bottom Interleave / Carrier | 0.051 mm Release PET | — |
Mechanical Properties
| Property | Value | Test Method |
| Durometer | 77 Shore A Points | ASTM D2240 |
Thermal Properties
| Property | Value | Test Method |
| Thermal Conductivity | 1.5 W/°C·m @ 100°C | ASTM E1530 |
| Thermal Impedance @ 380 psi | 0.29 °C·in²/W | ASTM E1530 |
| Min. Operating Temperature | -101°C | — |
| Max. Operating Temperature | 204°C | — |
| Glass Transition Temperature (Tc) | -118°C | ASTM 3418 |
Electrical Properties
| Property | Value | Test Method |
| Dielectric Strength | 53.1 kV/mm | ASTM D149 |
Flame & Fire Performance
| Property | Value | Test Method |
| Flammability Rating | UL94 V-0 | UL 94 |
| UL Rating | E54153 (RTI 150°C/150°C) | UL |
Processing & Packaging
| Property | Value | Test Method |
| Recommended Cure Cycle | 15 minutes @ 250°F and 50 psi | — |
| Shelf Life | 6 Months | — |
| Shelf Life Storage Temperature | 7.2°C ± 1.6°C | — |
| Shipment | Refrigerated shipment recommended | — |
Compliance
- UL 94 — Compliant (V-0)
- UL Listed — E54153 (RTI 150°C/150°C, Mechanical and Electrical)
- Thermal interface bonding requiring high dielectric strength
- Power electronics assembly
- Heat sink attachment with electrical isolation
- LED module bonding
- Power module thermal management
Common industries: power electronics, power module manufacturing, LED lighting, and thermal management.
Secure 1500 KT2 is a thermal interface adhesive in the Secure family of double-sided uncured silicone constructions, engineered for thermal bonding applications that require electrical isolation, reliable thermal transfer, and high dielectric strength in a thin profile. The construction places thermally conductive uncured silicone on both sides of a Kapton MT substrate, with the polyimide film providing high dielectric strength and a thin, dimensionally stable carrier.
At 0.191 mm overall, Secure 1500 KT2 is the thinnest grade in the Secure adhesive line, and pairs that thin profile with the highest dielectric strength (53.1 kV/mm) and lowest thermal impedance (0.29 °C·in²/W at 380 psi) of the family.
Mechanical and physical performance includes 77 Shore A durometer, 2.50 specific gravity, 0.448 kg/m² total product weight, and a glass transition temperature of -118°C. Thermally, the material delivers 1.5 W/°C·m thermal conductivity at 100°C and 0.29 °C·in²/W thermal impedance at 380 psi, across an operating range of -101°C to +204°C. Electrically, the dielectric strength is 53.1 kV/mm. The product is UL listed under E54153 with a UL 94 V-0 flammability rating and RTI 150°C/150°C for both mechanical and electrical applications.
The construction is supplied with a 0.038 mm Polyethylene interleave on Side 1 and a 0.051 mm Release PET carrier on Side 2; 0.064 mm of uncured silicone is on Side 1 and 0.102 mm on Side 2, with a 0.025 mm Kapton MT substrate between them. Recommended cure cycle is 15 minutes at 250°F and 50 psi. Shelf life is 6 months at a storage temperature of 7.2°C ± 1.6°C, and the manufacturer recommends refrigerated shipment.
Compliant with UL 94 V-0 and UL listing E54153 (RTI 150°C/150°C).
What differentiates Secure 1500 KT2 from the Fiberglass-substrate 48A51R009 and 48A51R016?
Secure 1500 KT2 uses a 0.025 mm Kapton MT polyimide substrate rather than Style 1080 Fiberglass, and is the thinnest grade in the Secure family at 0.191 mm overall. The Kapton MT substrate raises dielectric strength to 53.1 kV/mm — the highest in the Secure line — and the thinner overall build gives it the lowest thermal impedance at 0.29 °C·in²/W at 380 psi. The trade-off versus the Fiberglass-substrate grades is less in-plane mechanical reinforcement; Kapton MT is selected when dielectric performance and thin profile are the priorities.
Why is dielectric strength important for this application?
The Secure adhesive's primary function is to bond a heat-generating component to a heat sink while keeping the two electrically isolated. The Kapton MT substrate provides that isolation, and the dielectric strength of 53.1 kV/mm per ASTM D149 — paired with UL RTI 150°C/150°C and V-0 flame rating — establishes the voltage withstand and aging performance that allows the bondline to safely separate a powered PCB or power module from a grounded heat sink. Among the Secure grades, this construction provides the highest dielectric strength.
What is the operating temperature range for Secure 1500 KT2?
The operating temperature range is -101°C to +204°C, with a glass transition temperature of -118°C. The UL relative thermal index (RTI) is 150°C for both mechanical and electrical applications.
Is Secure 1500 KT2 suitable for UL-rated electronics assemblies?
Yes. The material is UL listed under E54153 with a UL 94 V-0 flammability rating and RTI 150°C/150°C for both mechanical and electrical applications, making it suitable for UL-compliant power electronics, power module, LED, and thermal interface bonding work.
How should Secure 1500 KT2 be specified?
Specify grade (Secure 1500 KT2), part geometry (die-cut, kiss-cut, slit roll, or sheet), substrate (Kapton MT), overall thickness (0.191 mm) with adhesive build per side (0.064 mm Side 1, 0.102 mm Side 2), dielectric performance requirements, UL compliance (UL 94 V-0, E54153 RTI 150°C/150°C), cure cycle, and finished format.
