LiPOLY’s AS50-s is a fiberglass-reinforced thermal interface pad designed for applications where mechanical durability matters as much as thermal transfer. Most thermally conductive silicone pads are soft and conformable but can tear, puncture, or deform under assembly stress. The AS50-s solves this by embedding one or more layers of glass fiber cloth into a thermally conductive silicone substrate, giving the pad the toughness, tensile strength, and puncture resistance needed for high-volume manufacturing without giving up the thermal performance engineers expect from a 5.0 W/m·K material.
The AS50-s is part of LiPOLY’s fiberglass-reinforced series of thermal pads, which sit alongside the non-reinforced T-work line. The reinforcement layer changes how the material behaves in production: it holds dimensional stability during die-cutting, resists damage during automated placement, and maintains consistent thickness across large-area applications. With a thermal conductivity of 5.0 W/m·K, the AS50-s delivers solid thermal transfer for a reinforced pad while adding the mechanical properties that unreinforced silicone cannot provide on its own.
AS50-s Specifications
The AS50-s is built on a thermally conductive silicone substrate rated at 5.0 W/m·K per ASTM D5470. The fiberglass reinforcement layer is integrated directly into the pad, not applied as a separate film, so the material remains a single conformable layer that can be die-cut, supplied in sheets, or delivered in roll form. Thermal impedance is measured at 0.398 °C-in²/W at 10 psi and 0.287 °C-in²/W at 50 psi, meaning the pad conforms well under moderate clamping pressure and improves further as mounting pressure increases. The pad is rated for application temperatures from -60°C to 180°C, covering the full range of automotive, telecom, and industrial electronics environments. It has a hardness of 25 Shore OO, placing it on the softer end of the reinforced pad scale so it still fills uneven surface gaps effectively. Thickness is customized to the application per ASTM D374. The material is gray in color with a density of 3.1 g/cm³, and surface tack is available in one-side or two-side configurations—option 1 provides a single-sided tack surface for applications where the pad must adhere to one interface but remain clean on the other. The AS50-s is RoHS and REACH compliant.
Typical properties:
- Thermal conductivity: 5.0 W/m·K (ASTM D5470)
- Thermal impedance: 0.398 °C-in²/W @ 10 psi, 0.287 °C-in²/W @ 50 psi
- Color: Gray
- Surface tack: 2-side/1-side, option 1 (one-side)
- Reinforced layer: Fiberglass
- Thickness: Customized (ASTM D374)
- Density: 3.1 g/cm³ (ASTM D792)
- Hardness: 25 Shore OO (ASTM D2240)
- Application temperature: -60°C to 180°C
- Compliance: RoHS & REACH
Download the AS50-s datasheet at lipoly.com
Applications Where AS50-s Excels
The AS50-s is designed for thermal interfaces that benefit from both reliable heat transfer and the structural integrity a fiberglass reinforcement layer provides. The pad fills the air gaps between a heat-generating component and its heat sink, conforming to surface irregularities while the fiberglass layer maintains pad integrity during assembly and throughout the product’s thermal cycling life. It is particularly well suited to applications where the pad may be handled during automated assembly, subjected to shock and vibration, or used in larger formats where an unreinforced pad might sag or tear.
- Between a component and heat sink: Primary use case—fills surface gaps with conformable silicone while fiberglass provides dimensional stability.
- Flat-panel displays: Thermal management for display driver ICs and backlight assemblies where pad durability and electrical isolation are required.
- LED / HDDs / DVDs: Heat dissipation for LED modules and storage devices where shock and vibration resistance matters.
- Heat pipe assemblies: Interface material between heat pipes and mounting surfaces, maintaining contact under mechanical stress.
- Memory modules: Thermal transfer for memory chips where thin, mechanically stable pads are needed.
- Power supplies: Heat management for power conversion components operating at elevated temperatures.
- 5G base station & infrastructure: Outdoor telecom enclosures where wide temperature range (-60°C to 180°C) and long-term reliability are critical.
- EV electric vehicle: Battery thermal management and power electronics in automotive environments subject to vibration and thermal cycling.
The fiberglass reinforcement gives the AS50-s two properties that matter in real-world assembly: high dielectric breakdown for electrical isolation between live components and grounded heat sinks, and good mechanical strength for resistance to puncture, tearing, and deformation. In applications where a power device sits at a different electrical potential than its heat sink, the pad functions as both thermal interface and electrical insulator. The fiberglass layer ensures the insulation barrier remains intact even if the pad is compressed, handled roughly during installation, or subjected to mechanical shock in service. This combination of thermal performance, electrical isolation, and mechanical durability is why the AS50-s is specified for automotive and telecom applications where field reliability is non-negotiable.
AS50-s and the LiPOLY Fiberglass-Reinforced Lineup
The AS50-s fits into LiPOLY’s broader thermal pad portfolio alongside the non-reinforced T-work series. The T-work9000 offers higher thermal conductivity in a non-reinforced pad for applications where maximum heat transfer is the priority and mechanical handling is less of a concern. The T-work8000 and T-work7000 provide mid-range non-reinforced options. The AS50-s is the choice when the application requires the fiberglass-reinforced construction—when the pad will be die-cut into complex shapes, handled in automated assembly, or deployed in environments where an unreinforced silicone pad would not survive the mechanical demands. Engineers selecting between the T-work and AS series should weigh thermal conductivity against mechanical requirements: if the pad needs to survive puncture, resist tearing during placement, or maintain dimensional stability across a large interface area, the AS50-s with its 5.0 W/m·K rating and fiberglass reinforcement is the appropriate specification.
Custom Die-Cut Supply Through NEDC
NEDC is an authorized converter of LiPOLY thermal products and supplies the AS50-s in custom die-cut parts, sheets, and roll form to meet specific application requirements. NEDC converts the AS50-s material to customer-specified dimensions using rotary die-cutting, flatbed die-cutting, and other precision cutting methods, producing parts ready for direct placement on production lines. Whether the application calls for a simple rectangular pad, a complex multi-feature geometry with registration holes, or material supplied in roll form for automated assembly equipment, NEDC works from customer drawings or samples to produce AS50-s parts that meet the dimensional and tolerance requirements of the end application. Material is stocked and converted in NEDC’s facility, and NEDC can advise on thickness selection, tack configuration, and design considerations specific to the AS50-s fiberglass-reinforced construction.
For more information on thermal interface materials available through NEDC, visit the thermal pads page.
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Need a custom AS50-s die-cut part? Contact NEDC with your specifications.