Secure® 99A50R008
Secure 99A50R008 is a fire-resistant single-sided thermal interface adhesive pad featuring 0.203 mm of uncured silicone between a 0.025 mm FEP top interleave and a 0.076 mm PTFE-coated fiberglass bottom carrier, with a thermal conductivity of 1.5 W/°C·m at 100°C and a dielectric strength of 30.8 kV/mm. The construction delivers thermal impedance of 0.28 °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: 0.28 °C·in²/W (ASTM E1530)
- Dielectric Strength: 30.8 kV/mm (ASTM D149)
- Durometer: 85 Shore A (ASTM D2240)
- Operating Temperature: -101°C to +204°C
- Overall Product Thickness: 0.203 mm
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Overall Product Thickness | 0.203 mm | — |
| Color | Mauve | — |
| Construction Designation | Construction 0 | Code Definitions |
| Specific Gravity | 2.50 | Arlon SQA-TMS-024 |
| Total Product Weight | 0.509 kg/m² | — |
Product Design & Construction
| Property | Value | Test Method |
| Top Interleave / Carrier | 0.025 mm FEP | — |
| Side 1 — Adhesive | 0.203 mm Uncured Silicone | — |
| Bottom Interleave / Carrier | 0.076 mm PTFE-coated Fiberglass | — |
Mechanical Properties
| Property | Value | Test Method |
| Durometer | 85 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 | 0.28 °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 | 30.8 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 |
| Fire-Resistant Formulation | Fire-resistant uncured silicone | — |
Processing & Packaging
| Property | Value | Test Method |
| Recommended Cure Cycle | 15 minutes @ 250°F and 50 psi | — |
| Shelf Life | 3 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)
- Fire-resistant thermal interface bonding
- Power electronics requiring flame retardancy
- LED module bonding in critical safety applications
- Heat sink attachment with electrical isolation
- Aerospace and defense thermal management
Common industries: power electronics, LED lighting, aerospace, defense, and safety-critical thermal management.
Secure 99A50R008 is a fire-resistant thermal interface adhesive pad in the Secure family, engineered for thermal bonding applications that combine reliable thermal transfer with documented flame retardancy. The 99A50R series uses a single-sided construction: a 0.203 mm fire-resistant uncured silicone layer sandwiched between a 0.025 mm FEP top interleave (for clean release) and a 0.076 mm PTFE-coated fiberglass bottom carrier.
99A50R008 increases the silicone build over 99A50R007, providing more adhesive material between bonded surfaces for applications that need additional wet-out and bondline accommodation.
Mechanical and physical performance includes 85 Shore A durometer, 2.50 specific gravity, 0.509 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 0.28 °C·in²/W thermal impedance at 380 psi, across an operating range of -101°C to +204°C. Electrically, the dielectric strength is 30.8 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. Recommended cure cycle is 15 minutes at 250°F and 50 psi. Shelf life is 3 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 99A50R008 from the thinner 99A50R007 or the higher-dielectric 99A50R009?
99A50R008 uses 0.203 mm of fire-resistant uncured silicone — more than the 0.1524 mm in 99A50R007 — to provide additional adhesive material between bonded surfaces. Compared with the 99A50R009 (which carries the same silicone build but a different overall product thickness), 99A50R008 has lower dielectric strength (30.8 versus 32.7 kV/mm) and similar thermal impedance (0.28 versus 0.29 °C·in²/W at 380 psi). The grade fits applications that need a thicker uncured silicone layer than 99A50R007 but do not require the higher dielectric performance of 99A50R009.
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 PTFE-coated fiberglass carrier and the uncured silicone provide that isolation, and the dielectric strength of 30.8 kV/mm per ASTM D149 — paired with UL RTI 150°C/150°C, V-0 flame rating, and the fire-resistant silicone formulation — establishes the voltage withstand and flame behavior required for safety-critical power electronics, LED, aerospace, and defense bondlines.
What is the operating temperature range for Secure 99A50R008?
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 99A50R008 suitable for UL-rated, fire-resistant electronics assemblies?
Yes. The material is UL listed under E54153 with a UL 94 V-0 flammability rating, RTI 150°C/150°C for both mechanical and electrical applications, and a fire-resistant uncured silicone formulation, making it suitable for UL-compliant power electronics, LED, aerospace, and defense thermal interface bonding.
How should Secure 99A50R008 be specified?
Specify grade (Secure 99A50R008), part geometry (die-cut, kiss-cut, slit roll, or sheet), single-sided fire-resistant uncured silicone construction (0.203 mm) with FEP top interleave and PTFE-coated fiberglass bottom carrier, overall thickness (0.203 mm), dielectric performance requirements, UL compliance (UL 94 V-0, E54153 RTI 150°C/150°C), cure cycle, and finished format.
