YDNFoam™ 4 kg/m³ Ultra-Lightweight Melamine Foam
Lightweight Thermal Protection Solution for Rocket and Launch Vehicle Fairing Insulation

1. Application Background: The Challenge of Extreme Thermal Environments
Rocket and launch-vehicle fairings play a critical role in protecting satellites and payloads from aerodynamic heating, acoustic vibration, and structural stress during ascent.
During the launch phase, the outer surface of the fairing can reach +200 °C, while the inner payload compartment must be kept below −40 °C — a temperature difference of more than 240 °C.
Traditional insulation materials such as glass wool, aramid honeycomb, and aluminum foam provide partial protection but face persistent drawbacks:
High density → increases the total vehicle mass, reducing thrust-to-weight efficiency.
Complex processing → difficult to form and bond over large curved composite surfaces.
Thermal aging → performance degradation after repeated launch cycles.
A new generation of insulation is therefore required — ultra-lightweight, wide-temperature-range, thermally formable, and intrinsically flame-retardant — to meet the growing demands of modern aerospace systems.

2. YDNFoam™ Material Properties and Structural Advantages
Property Value Technical Note
Density 4 ± 0.3 kg/m³ Industry-leading ultralight density for weight reduction
Thermal Conductivity ≤ 0.032 W/m·K Excellent thermal insulation at ambient temperature
Service Temperature Range −200 °C to +240 °C Withstands extreme cold-hot cycling
Sound Absorption (NRC) ≥ 0.85 Attenuates acoustic and vibration energy during launch
Flame Retardancy Intrinsic — UL 94 V-0 Halogen-free, non-smoking, non-melting
Radiation / Aging Resistance Excellent Long-term structural stability in aerospace environments
Processability Cuttable, thermally formable, laminable Compatible with aluminum foil, carbon fiber, and aerogel composites
YDNFoam™ features a unique micro-cellular skeletal network, in which each closed cell is formed by a highly cross-linked melamine resin matrix.
This honeycomb-like thermal-barrier architecture effectively prevents heat transfer while maintaining outstanding compressive stability.
The combination of extremely low density and high structural integrity delivers more than 30 % higher insulation efficiency than conventional materials of equivalent thickness.

3. Fairing Insulation Design
Typical Layer Configuration:
Outer Layer: Carbon-fiber-reinforced composite skin
Middle Layer: YDNFoam™ ultra-light thermal insulation core (thickness 10–30 mm)
Inner Layer: Aluminum foil / aramid fabric heat-barrier layer + adhesive bonding system
Key Performance Highlights:
Thermal Stability: Maintains shape and integrity under continuous service at +240 °C and remains flexible at −200 °C.
Structural Compatibility: Excellent adhesion with CFRP/epoxy skins using high-temperature adhesives or silicone-based bonding agents.
Acoustic Damping: Absorbs intense 500 Hz–4 kHz launch acoustic loads, protecting sensitive satellite electronics.
Reusability: Easily cleaned and re-installed after launch cycles, supporting reusable rocket systems.

4. Verified Performance Data
Test Item Result Remark
Thermal Conductivity (25 °C) 0.031 W/m·K Better insulation than glass wool of equal thickness
Linear Shrinkage (200 °C × 72 h) ≤ 0.5 % Exceptional dimensional stability at high temperature
Limiting Oxygen Index (LOI) ≥ 32 % Intrinsically flame-retardant, additive-free
Vibration Absorption Rate +40 % Effective suppression of structural resonance
Specific Gravity Reduction −65 % vs aramid honeycomb Enables substantial fairing weight savings

5. Typical Aerospace Applications
🚀 Launch Vehicle Fairing Insulation Liners — prevents aerodynamic heat transfer to satellite bays.
🛰️ Stage-Transition Insulation Layers — ensures thermal balance between propulsion stages.
🔋 Aerospace Battery / Control Module Thermal Barriers — stabilizes critical onboard systems.
🧊 Cryogenic Tank Support Pads (LH₂ / LOX) — prevents frost formation and condensation.

6. Conclusion: A New Era of Lightweight Aerospace Materials
With its ultra-low density (4 kg/m³), wide service temperature range (−200 °C to +240 °C), and intrinsic flame-retardant safety,
YDNFoam™ has become a breakthrough material for next-generation rocket and launch vehicle thermal-protection systems.
Its balance of thermal insulation, acoustic damping, and reusability supports both traditional expendable rockets and emerging reusable platforms.
YDNFoam™ continues to collaborate with global aerospace partners to advance lightweight materials and promote sustainable, high-efficiency flight technology.

📞 Contact Information
YDNFoam™ | Advanced Melamine Foam Manufacturer
📍 Address: No. 2088, Jiuliting Avenue, Caoqiao Street, Pinghu City, Zhejiang Province, China
📧 Email: [email protected]
🌐 Website: www.ydnfoam.com
📞 Phone / WeChat: +86-135-4070-2776