Protect® 48A53R009
Protect 48A53R009 is a thermally conductive, ready-to-use thermal interface insulator pad featuring fully cured silicone on both sides of a Style 1080 Fiberglass substrate, with a thermal conductivity of 1.5 W/°C·m at 100°C and a dielectric strength of 42.7 kV/mm. The 0.229 mm overall construction delivers thermal impedance of 0.40 °C·in²/W at 380 psi across an operating range of -46°C to +204°C. UL listed (E54153) with a UL 94 V-0 flame rating, fire-resistant features, and a 60-month shelf life at room temperature.
Key Properties
- Thermal Conductivity: 1.5 W/°C·m @ 100°C (ASTM E1530)
- Thermal Impedance @ 380 psi: 0.40 °C·in²/W (ASTM E1530)
- Dielectric Strength: 42.7 kV/mm (ASTM D149)
- Durometer: 85 Shore A (ASTM D2240)
- Operating Temperature: -46°C to +204°C
- Overall Product Thickness: 0.229 mm
We want to help!
Enter your information and we'll get you in touch with our knowledgable staff. We know how important to the right product for your project.
Request a Consultation
- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Overall Product Thickness | 0.229 mm | — |
| Color | Mauve | — |
| Construction Designation | Construction 3 | Code Definitions |
| Specific Gravity | 2.50 | Arlon SQA-TMS-024 |
| Total Product Weight | 0.522 kg/m² | — |
| Features | Fire-Resistant | — |
Product Design & Construction
| Property | Value | Test Method |
| Top Interleave / Carrier | 0.064 mm Polyethylene | — |
| Side 1 — Silicone | 0.076 mm Cured Silicone | — |
| Substrate | 0.076 mm Style 1080 Fiberglass | — |
| Side 2 — Silicone | 0.076 mm Cured Silicone | — |
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 | 0.40 °C·in²/W | ASTM E1530 |
| Min. Operating Temperature | -46°C | — |
| Max. Operating Temperature | 204°C | — |
Electrical Properties
| Property | Value | Test Method |
| Dielectric Strength | 42.7 kV/mm | ASTM D149 |
Flame & Fire Performance
| Property | Value | Test Method |
| Flammability Rating | UL94 V-0 | UL 94 |
| UL Rating | E54153 | UL |
| Fire-Resistant Features | Yes | — |
Processing & Packaging
| Property | Value | Test Method |
| Shelf Life | 60 Months | — |
| Shelf Life Storage Temperature | 23.8°C ± 1.6°C (room temperature) | — |
| Ready-to-Use | Fully cured silicone — no cure cycle required | — |
Compliance
- UL 94 — Compliant (V-0)
- UL Listed — E54153 (UL94 V0, RTI 150°C/150°C as stated on TDS)
- Thermal interface insulation under mechanical fasteners
- Power electronics assembly
- Heat sink interface with electrical isolation
- LED module thermal management
- Fire-resistant electrical isolation pads
Common industries: power electronics, LED lighting, thermal management, and fire-resistant electronics assembly.
Protect 48A53R009 is a thermal interface insulator pad in the Protect family, engineered as a ready-to-use insulator rather than a bonding adhesive. Unlike the Secure line, which uses uncured silicone that requires a cure cycle to form a permanent bond, the Protect line uses fully cured silicone laminated to both sides of a Style 1080 Fiberglass substrate, making the pad immediately functional in assembly.
The construction combines fire-resistant features, mechanical strength from the fiberglass substrate, and a long 60-month shelf life at room temperature, providing significant inventory flexibility versus refrigerated, short-shelf-life uncured products.
Mechanical and physical performance includes 85 Shore A durometer, 2.50 specific gravity, and 0.522 kg/m² total product weight. Thermally, the material delivers 1.5 W/°C·m thermal conductivity at 100°C and 0.40 °C·in²/W thermal impedance at 380 psi, across an operating range of -46°C to +204°C. Electrically, the dielectric strength is 42.7 kV/mm.
The product is UL listed under E54153 with a UL 94 V-0 flammability rating and carries fire-resistant features. The construction consists of a 0.064 mm Polyethylene top interleave, 0.076 mm cured silicone on Side 1, a 0.076 mm Style 1080 Fiberglass substrate, and 0.076 mm cured silicone on Side 2, for a total product thickness of 0.229 mm. Shelf life is 60 months at a room-temperature storage of 23.8°C ± 1.6°C.
Compliant with UL 94 V-0, UL listing E54153 (UL94 V0, RTI 150°C/150°C as listed on TDS).
What differentiates Protect 48A53R009 from the Secure thermal interface adhesives?
The Protect line uses fully cured silicone, which makes Protect 48A53R009 a ready-to-use insulator pad that requires no cure cycle and no refrigerated storage — the Secure line, by contrast, uses uncured silicone that must be cured at 250°F and 50 psi after assembly and must be refrigerated with a 3- to 6-month shelf life. Protect 48A53R009 carries a 60-month shelf life at room temperature (23.8°C ± 1.6°C), providing significant inventory and handling advantages, while still delivering 1.5 W/°C·m thermal conductivity, 42.7 kV/mm dielectric strength, UL 94 V-0, and fire-resistant features.
Why is dielectric strength important for this application?
The Protect insulator's primary function is to thermally couple a heat-generating component to a heat sink while keeping the two electrically isolated. The Style 1080 Fiberglass substrate provides that isolation, and the dielectric strength of 42.7 kV/mm per ASTM D149 — paired with the UL E54153 listing, V-0 flame rating, and fire-resistant construction — establishes the voltage withstand and flame behavior required to safely separate a powered PCB or power transistor from a grounded heat sink in LED, power electronics, and similar service.
What is the operating temperature range for Protect 48A53R009?
The operating temperature range is -46°C to +204°C. (The TDS notes that the Specifications line includes RTI 150°C/150°C under the UL E54153 listing.)
Is Protect 48A53R009 suitable for UL-rated and fire-resistant electronics assemblies?
Yes. The material is UL listed under E54153 with a UL 94 V-0 flammability rating and fire-resistant construction, making it suitable for power electronics, LED, and other thermal interface insulation applications requiring documented flame retardancy and electrical isolation.
How should Protect 48A53R009 be specified?
Specify grade (Protect 48A53R009), part geometry (die-cut, kiss-cut, slit roll, or sheet), substrate (Style 1080 Fiberglass), overall thickness (0.229 mm) with cured silicone build per side (0.076 mm), dielectric performance requirements, UL compliance (UL 94 V-0, E54153), fire-resistant features, and finished format. Cure cycle is not required.
