Liquid cooling has become the standard for high-density data center thermal management. Inhibited propylene glycol-based coolants at 25% concentration — such as the widely used LC-25 — offer solid performance. However, supply chain volatility and rising procurement costs have become growing concerns for facility operators.
This article provides a technical comparison between LC-25 and Glacier Coolant LM-4ABG (25%), based on publicly available data and internal testing, to help you evaluate a reliable, cost-effective alternative.
The Cost Challenge of 25% Propylene Glycol Coolants
The typical performance specifications of a 25% inhibited propylene glycol-based heat transfer fluid (e.g., LC-25) are summarized below:
| Parameter | Typical Value |
|---|---|
| Freezing Point | -10°C |
| Boiling Point | 101.4°C |
| Thermal Conductivity @20°C | 0.456 W/(m·K) |
| Specific Het @20°C | 3.87 kJ/(kg·K) |
| Viscosity @20°C | 2.80 cP |
| pH | 8.0-10.5 |
| Chloride | <5 ppm |
| Sulfate | <10 ppm |
Despite their performance, two practical challenges persist:
Rising procurement costs — driven by supply chain disruptions, logistics, and brand premium
Supply uncertainty — extended lead times pose risks for time-sensitive projects
How LM-4ABG Compares: Data You Can Trust
The following table compares LC-25 with Glacier Coolant LM-4ABG (25% concentration), based on internal test data and publicly available technical documentation.
Performance Comparison Table
| Parameter | LC-25 | Glacier Coolant LM-4ABG (25%) | Comparison |
|---|---|---|---|
| Freezing Point | -10°C | ≤ -10°C | Equivalent |
| Boiling Point | 101.4°C | 101°C | Equivalent |
| Thermal Conductivity @20°C | 0.456 W/(m·K) | 0.46 W/(m·K) | Slightly better |
| Specific Heat @20°C | 3.87 kJ/(kg·K) | 3.92 kJ/(kg·K) | Slightly better |
| Viscosity @20°C | 2.80 cP | 2.41 cP | Significantly better |
| pH | 8.0-10.5 | 7.0-11.0 | Both alkaline |
| Chloride | <5 ppm | <25 ppm | Well below corrosion threshold |
| Sulfate | <10 ppm | <25 ppm | Well below corrosion threshold |
*Note: LC-25 performance data is sourced from publicly available technical documentation for reference purposes only.*
Why Lower Viscosity Means Lower PUE
Viscosity shows the most significant difference between the two fluids. LM-4ABG has a viscosity of 2.41 cP at 20°C, while LC-25 measures 2.80 cP — a difference of approximately 14%.
How viscosity impacts system operation:
Lower pump energy consumption — reduced flow resistance lowers the power required for circulation pumps
Better low-temperature startup — faster flow establishment during cold starts or low ambient temperatures
Reduced system pressure drop — enables the use of smaller pumps or extends the life of existing ones
For large data center cooling systems, this translates into measurable annual electricity savings and directly contributes to a lower PUE.
Heat transfer efficiency: LM-4ABG shows slightly higher thermal conductivity (0.46 vs. 0.456 W/m·K) and specific heat (3.92 vs. 3.87 kJ/kg·K), meaning more heat can be transferred per unit time and more thermal energy can be carried away per unit mass.
Corrosion control: Both products have chloride and sulfate levels well below industrial corrosion thresholds, and operate in the alkaline pH range (8-11), providing a good passivation environment for metals such as carbon steel, copper, and brass. Corrosion inhibition performance is comparable between the two.
The Bottom Line: Performance Without Compromise
Based on core heat transfer metrics, LM-4ABG is not a "cheap substitute" but a technically competitive alternative:
| Parameter | Conclusion |
|---|---|
| Thermal Conductivity | LM-4ABG slightly better |
| Specific Heat | LM-4ABG slightly better |
| Viscosity | LM-4ABG significantly better (14% lower) |
| Corrosion Control | Equivalent |
| Overall Heat Transfer | LM-4ABG expected to be better |
Key advantages summarized:
Lower viscosity → lower pump energy → lower PUE
Comparable freeze and corrosion protection → uncompromised system safety
Stable supply and lower procurement cost → better total cost of ownership (TCO)
For data center operators seeking lower PUE and better TCO, LM-4ABG is a worthy option to evaluate.
Cost & Supply: The Real-World Advantages
Without compromising performance, LM-4ABG delivers direct commercial benefits:
| Advantage | Description |
|---|---|
| Procurement Cost | Estimated 30-40% lower compared to similar 25% inhibited propylene glycol products (e.g., LC-25), based on bulk purchase estimates |
| Supply Stability | Reliable and controllable lead times — no more long waits |
| Compliance Simplicity | Not classified as hazardous (GHS no classification); easier transport, storage, and workplace compliance |
Quality, Compatibility & Compliance
Product Quality
LM-4ABG Glacier Coolant is manufactured by Chaoyang Guangda Chemical Co., Ltd., using an inhibited propylene glycol formulation specifically designed for closed-loop circulation systems. Key TDS and SDS data are derived from internal technical files and third-party testing.
Material Compatibility
Consistent with industry benchmark products, LM-4ABG demonstrates good compatibility with common system metals (carbon steel, stainless steel, copper, brass) and elastomers (EPDM, NBR, etc.). For a detailed compatibility list, please contact our technical engineers.
Regulatory Compliance
This product is not classified as dangerous goods, with minimal restrictions on transport and storage, meeting environmental and safety entry standards for most industrial facilities.
Technical Resources (Partial TDS Preview)
| Parameter | LM-4ABG |
|---|---|
| Composition (% by weight) | |
| Propylene glycol | 25% |
| Corrosion inhibitor | ≥1% |
| Deionized water | ≤74% |
| Color | Light color or colorless liquid |
| Density at 20°C (g/cm³) | 1.02 ± 0.02 |
| Freezing point (°C) | -10 |
| Boiling point (°C) | 101 |
| Viscosity at 20°C (cP) | 2.41 |
| Thermal conductivity at 20°C (W/m·K) | 0.46 |
| Specific heat at 20°C (kJ/kg·K) | 3.92 |
Next Steps: Test, Compare, Transition
For operations teams or procurement managers evaluating coolant optimization options, we recommend the following approach:
Sample Testing — Request an LM-4ABG sample from Glacier Coolant and validate compatibility and heat transfer efficiency in your skid unit or single rack.
Cost Assessment — Provide your annual usage volume, and we will deliver a direct financial cost comparison report.
Gradual Replacement — Existing coolant in your system does not need to be drained all at once. A scientifically designed mixing protocol allows for smooth transition through gradual replacement.
Safety & Environmental: Equal Peace of Mind
Based on publicly available SDS information:
| Parameter | LC-25 | LM-4ABG |
|---|---|---|
| Acute Oral Toxicity | LD50 >20,000 mg/kg (very low toxicity) | Same grade of propylene glycol — safety profile equivalent |
| Biodegradability | Readily biodegradable (81% / 28 days) | Same grade of propylene glycol — environmental profile equivalent |
LM-4ABG uses high-purity propylene glycol raw material, achieving the same level of safety and environmental performance as industry benchmark products.
Conclusion: A Smarter Choice for Data Center Cooling
Finding more economical cooling media without compromising core thermal performance is an inevitable trend in data center industry evolution. Glacier Coolant LM-4ABG demonstrates its capability through data and delivers value through cost efficiency.
※ Disclaimer:
*The LC-25 performance data cited in this article is sourced from publicly available technical documentation for reference purposes only. LM-4ABG performance data is derived from internal testing and publicly available technical information. Due to variations in specific operating environments, users are advised to conduct adequate suitability testing before bulk use. Results are for reference only. The company assumes no liability for any direct or indirect losses arising from reliance on the data contained in this article.*