Use Case: Military Rotorcraft & UAVs

Erosion-Resistant Coatings for Rotor Systems and Hot Zones.

Replace brittle silicones and heavy heat shields with flexible, fuel-resistant coatings for nacelles, thrust reversers, and engine bays.

250°C
Longterm temp rating
FKM Chemistry
Erosion and fluid resistant
3–5×
Extended repaint interval

The hot zone compromise

Nacelles and Exhaust Zones Exceed Polyurethane Limits.

"Nacelles, thrust reversers, and APU compartments routinely exceed 177°C / 350°F — beyond polyurethane limits. Current solutions force trade-offs between thermal protection, chemical resistance, and flexibility."

Every coating on the market solves one problem and creates three more. Silicones handle the heat but crack under vibration and don't resist Skydrol. Ceramics are too heavy. Polyurethanes fail at temperature. Bare metal corrodes and adds weight. Engineers have been living with these compromises for decades.

GREOS ENDURE eliminates all four failure modes simultaneously — in a standard spray application that drops into existing finishing workflows.

Why current solutions fall short

Polyurethane
Fails in exhaust zone temperatures

Degrades above 177°C / 350°F, frequent repaint cycles in hot zones

Silicone
Cracks under rotor vibration

Brittle failure under cyclic loading, poor fluid resistance

Ceramic
Too heavy for rotary-wing

Weight penalty unacceptable for helicopter performance budgets

Bare Metal
Corrosion in desert environments

Sand abrasion and moisture cause rapid degradation in field conditions

Why materials engineers choose GREOS

Reduce Repaint Cycles While Cutting Component Weight.

GREOS ENDURE is the only coating that delivers 250°C / 480°F thermal protection with true elastomeric flexibility AND flight line fluids resistance. This capability does not exist anywhere else in the aerospace coatings industry.

Erosion & Vibration Resistance
Elastomeric flexibility maintains protective properties under sand impact and vibration — critical for rotor blade leading edges and UAV skins in desert operations.
High-Temperature Performance
Longterm exposure up to 250°C / 480°F without embrittlement. Protects engine cowlings, exhaust regions, and hot zone fuselage panels where polyurethane fails.
Fuel & Hydraulic Fluid Resistance
FKM chemistry resists hydraulic fluids, fuel, and de-icing fluids. Proven in aerospace seals — now sprayable for large surface protection.
Lightweight Protection
Thin spray-applied films replace heavy metal shields, contributing to weight reduction and improved platform performance and endurance.
Standard Application
No special equipment. No process changes. Compatible with existing rotary-wing MRO workflows and depot finishing operations.
High-Tempo Durability
Extended repaint intervals reduce maintenance downtime and total cost of ownership for high-utilization military rotorcraft and UAV fleets.

Where to specify GREOS

Critical Protection Zones on Commercial & Military Aircraft.

GREOS ENDURE is designed for any airframe surface where thermal demand exceeds polyurethane limits while maintaining flexibility, chemical resistance, and OEM finish requirements.

Rotor Blade Leading Edges
High-speed sand and particulate impact, combined with centrifugal loading and thermal exposure from main rotor downwash in desert operations.
GREOS ENDURE
Engine Cowlings & Exhaust Zones
Sustained exhaust heat exposure up to 250°C / 480°F combined with vibration, hydraulic fluid contact, and erosion from rotor downwash.
GREOS ENDURE
UAV Fuselage Hot Zones
Engine exhaust zones, motor housings, and hot-surface access panels on unmanned systems requiring lightweight protection with minimal maintenance.
GREOS ENDURE
Depot MRO Repaint
Hot zone repaint at depot and forward operating locations — standard spray application with CARB-exempt solvents, no process qualification required.
GREOS ENDURE

Environmental compliance

CARB-Compliant. Low-VOC. Non-PFAS.

GREOS coatings use California CARB-exempt solvents and non-PFAS dispersants, meeting stringent environmental regulations without compromising performance. Compliant for OEM manufacturing and MRO depot operations in California and global markets.

Low VOC Emissions
CARB-exempt solvent blend compliant for indoor application in regulated manufacturing environments
Non-PFAS Dispersants
Formulated without PFAS dispersants to support PFAS-free procurement requirements
CARB-Exempt Solvent System
Compliant for ground operations and depot application under California Air Resources Board regulations
Global Market Compliance
Formulated to meet or exceed environmental regulations in major aerospace manufacturing markets worldwide

Testing & qualification

Engineered to Meet Aerospace Standards.

GREOS ENDURE formulations are designed to meet recognized aerospace and aviation standards. GREOS provides evaluation samples and test method reference suites for customer qualification programs.

Thermal & Environmental
  • ASTM D573Heat aging resistance
  • RTCA DO-160GThermal cycling, humidity, salt fog
  • ASTM D746Low temperature brittleness
  • ASTM G155Xenon arc weathering
Fluid Resistance
  • BMS 10-86Flight line fluids compatibility
  • ASTM D471Fuel immersion resistance
  • SAE AMS 1424/1428De-icing fluid resistance
Mechanical & Adhesion
  • ASTM D412Tensile strength and elongation
  • ASTM D4541Pull-off adhesion strength
  • ASTM D968Abrasion resistance
  • MIL-STD-3034Rain erosion resistance

Performance characteristics and temperature ratings are based on internal laboratory testing. Actual results may vary by application, substrate, and operating conditions. Customers should conduct their own testing to confirm suitability for specific use cases. Information provided is for reference only and does not constitute a warranty or performance guarantee. For application-specific guidance, contact the GREOS technical team.

Other Applications
GREOS coatings serve every high-temperature aerospace and defense environment.
Use Case – Commercial and Military Aviation
Use Case – Defense Advanced Platforms
Use Case – Space and Launch Systems
Use Case – Advanced Air Mobility

Specify GREOS for Your Next Hot Zone Application.

Request the technical datasheet to review performance characteristics, application specifications, and test method references for nacelle, exhaust, and engine bay applications. Evaluation samples available for customer qualification testing.

Request Technical Datasheet Contact Application Engineer