Military & Rugged Electronics
Thermal Interface Materials for Mission-Critical, Harsh-Environment Electronics
Sheen supplies thermal pads, silicone-free TIMs, potting/adhesives, and silicone foams engineered for wide temperature swings, shock/vibration, sealing, and long-life reliability.
Wide-temp Stability
Materials designed to keep contact & thermal performance in thermal cycling.
Sealing + Cushioning
Foamed silicone for gasketing, vibration damping, and enclosure protection.
Engineering Support
Die-cut shapes, adhesive options, cure profiles, and application guidance.
Typical Platforms
- Rugged radios, SDR units, baseband & RF power modules
- Mission computers, embedded AI/FPGA modules, storage & networking
- Sealed power conversion: DC-DC, inverters, high-frequency transformers
- Sensor modules: radar/vision processing, navigation & control electronics
Harsh-Environment Thermal Challenges
Military and rugged electronics often operate in sealed enclosures, under high shock/vibration, and across wide temperature profiles. Material selection must balance heat transfer, mechanical stress control, and long-life stability.
Thermal Cycling & Shock
Prevent cracking, pumping-out, and thermal resistance drift during cycling.
Shock/Vibration Load
Low-stress gap fillers reduce board strain while maintaining contact pressure.
Sealing & Ingress
Foamed silicone supports gasketing, damping, and enclosure protection.
Contamination Sensitivity
Silicone-free options can mitigate siloxane/bleed risks for sensitive assemblies.
Solutions by Integration Scenario
Choose by interface type first (chip-to-heatsink, PCB-to-chassis, module-to-cold plate), then refine by gap, pressure, isolation, sealing target, and contamination constraints.
Chip / Module → Heatsink
Phase-change / grease / thin pad / carbon-fiber TIM
- Target minimal thermal resistance for processors & RF power devices
- Use thin solutions when mounting pressure is sufficient
- Optional adhesive backing for assembly efficiency
PCB → Chassis / Heat Spreader
Silicone thermal pads (SF) / silicone-free pads (AF)
- Bridge tolerance stack-ups and board flatness variation
- Electrical insulation available for power electronics layouts
- Silicone-free choice for optics/contacts sensitive systems
Sealed Enclosures & Protection
Thermal potting + silicone foam gasket
- Potting improves insulation, mechanical reinforcement & heat spreading
- Foam silicone supports sealing, damping, and long-life compression
- Design for serviceability: partial potting / controlled dispense
Manufacturing Options
Die-cut custom shapes, thickness range selection, adhesive (single/double side), and dispensing/printing process compatibility. Provide your drawing or contact area; Sheen can recommend stack-up and production-friendly formats.
Material Portfolio (Engineer-Focused)
Below is a practical starting set for rugged electronics programs. Final selection should be verified by your gap/pressure window, insulation needs, and environment profile.
Silicone Thermal Pad (SF Series)
General-purpose gap fillers for rugged enclosures, PCB-to-chassis, and power boards.
- up to 15 W/m·K (by grade)
- mm-level stack-ups for tolerance bridging
- dielectric strength options
- V-0 options
Silicone-Free Thermal Pad (AF Series)
For contamination-sensitive systems where silicone bleed/volatiles are a concern.
- up to 6 W/m·K
- 0.5–5.0 mm
- down to -40℃ class
- optics-adjacent, sensitive contacts, high-end control electronics
Thermal Potting (US-5201 Series)
For sealed modules: insulation + mechanical reinforcement + heat spreading.
- 0.8–3.5 W/m·K (by grade)
- up to >5.0 kV/mm (AC, by grade)
- room-temp or heat-cure options
- power modules, transformers, rugged control boxes
Thermal Adhesive (TIV800 Series)
Bond + conduct heat where fasteners are limited and vibration is high.
- 1.0–2.0 W/m·K
- 5–10 min
- ≥1.5 MPa
- -50~200℃
Silicone Foam (SA700 Series)
Closed-cell foam for sealing, buffering, vibration damping, and IP gasketing.
- 200–400 kg/m³
- <5% @ 100℃
- UL94 V-0 / HF-1
- -55~220℃
Thermal Absorber Pad (MSF Series)
When you need both heat transfer and EMI/absorption performance in one layer.
- MSF500 3.0 W/m·K
- shielding can interfaces, high-density RF/control boards
- cut-to-shape; thickness by design window
Reliability & Validation (Typical)
Sheen highlights 1000-hour thermal shock, 1000-hour 85°C/85%RH, and 1000-hour high-temperature aging test capability/results positioning for long-life applications.
Reference Integration Examples (Non-Program-Specific)
The following examples describe common rugged electronics thermal architectures without program-specific details. They are intended to help engineers map interface types to material families.
Rugged Radio / SDR Processing Module
Use thin TIM (phase-change/grease/thin pad) between processor/FPGA module and heat spreader; use SF/AF pads for secondary hotspots to chassis.
gap tolerance window, mounting pressure, pump-out resistance, dielectric needs, rework strategy.
Sealed Power Conversion Unit
For sealed boxes, thermal potting improves insulation and mechanical support while spreading heat to enclosure walls; foam silicone gasket supports sealing and damping.
potting viscosity & cure, dielectric target, heat path design, serviceability (partial potting).
Sensor / Optics-Adjacent Electronics
For contamination-sensitive assemblies, prioritize silicone-free AF pads in interfaces near optics, sensitive contacts, or high-precision sensing components.
siloxane/bleed constraint, long-life stability, compression set, assembly cleanliness.
Material Selection Checklist (Copy/Paste for RFQ)
Send the following fields to Sheen to receive a recommended material stack-up (pad/gel/adhesive/potting/foam), thickness guidance, and prototype plan.
| Field | What to Provide | Why It Matters |
|---|---|---|
| Application & device | Rugged radio / mission computer / power converter / sealed enclosure / sensor module | Defines environment and interface priorities |
| Heat source & power | Device type (CPU/FPGA/PA/DC-DC) + W dissipation + hotspot size | Determines target thermal resistance and material family |
| Interface type | Chip→heatsink, PCB→chassis, module→cold plate, enclosure wall | Sets thickness and compliance requirements |
| Gap (min/typ/max) | mm + flatness/tolerance stack-up | Core input for thickness and compressibility selection |
| Mounting pressure | Estimated contact pressure/screw torque limit | Filters thin vs thick solutions; affects long-term drift |
| Electrical isolation | Need insulation? target dielectric strength (kV/mm) | Chooses pad grades / potting grades |
| Flame / safety rating | UL94 V-0 / HF-1 requirement | Critical for enclosed power systems and compliance |
| Environment | Shock/vibration, humidity, sealing target (IP), salt fog / dust | Decides foam gasket vs potting and material robustness |
| Contamination constraints | Silicone-free required? optics/contacts sensitive? | Triggers AF (silicone-free) selection strategy |
| Manufacturing | Die-cut shape, adhesive side, dispense method, cure constraints | Ensures DFM and stable production yield |
| Volume & timeline | Annual usage + prototype schedule | Optimizes sampling plan and cost structure |
FAQ (Military & Rugged Electronics)
Common engineering questions during material selection, prototype build, and reliability verification.
Start with your gap window and mounting pressure. Pads are best for repeatable thickness and simple assembly. Silicone-free pads are preferred when contamination constraints exist. Gels are useful when the gap varies significantly and you want low stress while maintaining contact.
Provide interface type, gap (min/typ/max), available pressure, power dissipation/hotspot size, insulation requirement, and environment profile (shock/vibration, humidity, sealing target). If you have a stack-up drawing, that accelerates thickness confirmation.
Use potting when you need combined protection (insulation + mechanical reinforcement) and stable heat spreading inside sealed modules. Consider serviceability: partial potting or controlled regions can preserve rework access while improving robustness.
Silicone foam is primarily for sealing, cushioning, and vibration damping (gasketing). It protects enclosures and supports IP sealing targets. It is commonly combined with a TIM (pad/gel/adhesive) that handles the main heat path.
Prototype with 2–3 candidate materials across your gap/pressure window, confirm thermal performance, then run reliability screens aligned to your program (thermal cycling, humidity, aging, vibration). Lock thickness and adhesive configuration once assembly repeatability is confirmed.
Yes. Provide your outline drawing (or contact area dimensions) and target thickness/gap; Sheen can propose die-cut formats, adhesive (single/double side), and process guidance to support stable assembly yield.
Get a Material Stack-Up Recommendation
Share your interface type, gap window, pressure, insulation target, and environment constraints. We will recommend candidate materials and a prototype plan aligned to your build process.
What to include in your message
- Gap (min/typ/max) + tolerance stack-up
- Power / hotspot map, target case temperature
- Insulation / flame rating requirements
- Shock/vibration + sealing target (IP)
- Silicone-free constraint (if applicable)
- Prototype quantity + schedule