1. Core Properties and Formulation

1. Composition

• Base Fluid: Ethylene glycol-distilled water blend (ratio undisclosed) with antioxidants (e.g., benzotriazole derivatives) and corrosion inhibitors.

• Additives:

• Anti-corrosion agents: Protect metals (aluminum, copper, steel) with 1,200-hour salt spray resistance (per GJB 6100-2007).

• Defoamers: Control foam volume (≤50 mL) and collapse time (≤5 seconds) to ensure heat transfer efficiency.

2. Key Physicochemical Parameters

   Parameter	Specification	Comparison (Great Wall -50)
   Freezing Point	≤-50°C	≤-60°C
   Boiling Point	≥107.5°C	118°C
   Density (20°C)	1.065–1.085 g/cm³	1.070–1.090 g/cm³
   pH Value	7.5–11.0	8.0
   Mechanical Impurities	≤0.05%	≤0.03%

• Freezing Adaptability: Covers northern China and cold zones (-40°C to -50°C) with a 15–20% cost advantage over competitors.

2. Standards and Certifications

1. Core Standards

• Military Compliance: Meets GJB 6100-2007 for rust prevention (salt spray test), high-temperature stability (≤50% evaporation loss), and low-temperature fluidity (pour point ≤-55°C).

• International Benchmarking: Aligns with MIL-PRF-63460F (U.S. standard) but prioritizes extreme cold adaptability (-50°C vs. U.S. -40°C).

2. Environmental Concerns

• Contains ethylene glycol (poor biodegradability); lags behind eco-friendly alternatives like Chevron Delo ELC (nitrate/borate-free).

3. Applications and Performance Highlights

1. Military Use

• Missile Systems: Ensures cold starts (-50°C) and thermal management for C-300 missile launcher vehicles.

• Armored Vehicles: Cools tank and IFV engines in dusty, humid, and saline environments.

• Radar Equipment: Maintains thermal stability for electronics at -50°C, preventing signal loss.

2. Civilian Applications

• Arctic Machinery: Replaces -35°C coolants in crawler excavators and ATVs.

• EV Potential: Adaptable to battery cooling (requires electrical conductivity adjustments).

3. Advantages

• Broad Temperature Range: Operates from -50°C to +107.5°C, outperforming civilian coolants (e.g., Skalan -45°C).

• Longevity: 3-year service life (vs. 2 years for standard coolants) due to antioxidant systems.

4. Market Competition and Positioning

1. Domestic Competitors

   Brand/Model	Freezing Point	Boiling Point	Cost Edge	Use Cases
   Teli No. 50	-50°C	107.5°C	High	Military/Arctic machinery
   Sinopec Great Wall -50	-60°C	118°C	High cost	Ultra-cold military

• Teli’s Edge: Custom packaging (4 kg/20 kg drums) and adjustable specifications (No. 50/55).

2. Global Competitors

• Chevron Delo ELC 50/50: Silicate-free for EGR/DPF engines but limited to -37°C.

• Totachi G12+ -50°C: Complies with VW TL 774-F but weaker anti-corrosion.

• Red Line SUPERCOOL: Boiling point ≥120°C but carries Prop 65 carcinogen warnings.

5. Usage and Maintenance Guidelines

1. Operational Protocols

• Refilling: Flush systems thoroughly; avoid mixing with silicate-based coolants.

• Dilution: Use deionized water (hardness ≤180 ppm) to prevent scaling.

2. Maintenance

• Testing: Monitor pH (replace if <7.5) and freezing point every 6 months.

• Storage: Keep in cool, dry areas to avoid ethylene glycol photodegradation.

6. Challenges and Future Development

1. Current Limitations

• Low-Temperature Viscosity: Reduced pump efficiency at -50°C (requires pour point depressants).

• Eco-Friendliness: Explore alternatives like propylene glycol or organic acid-based formulas (e.g., Repsol CXR).

2. R&D Trends

• Full-Synthetic Upgrades: Polyether/fluorinated fluids (e.g., FEC-50) for -60°C to +150°C.

• Smart Monitoring: IoT sensors for real-time analysis (pH, conductivity).

Summary and Recommendations

Teli No. 50 Coolant, compliant with GJB 6100-2007, excels in extreme cold adaptability, longevity, and military reliability. Its strengths include:

• Civil-Military Dual Use: Versatility for harsh environments and civilian machinery.

• Cost Efficiency: Mineral oil-based formula reduces deployment costs.

• Scalability: Potential in EV and smart cooling sectors.