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Coolants and Antifreeze
Ethylene Glycol, Propylene Glycol & Arctic Assist blends
30 products
About Coolants and Antifreeze
About Coolants and Antifreeze
Coolants and Antifreeze are heat transfer fluids primarily composed of Ethylene Glycol (CAS 107-21-1) or Propylene Glycol (CAS 57-55-6) designed to regulate temperature in closed-loop systems. These chemicals function by depressing the freezing point and elevating the boiling point of water while providing critical corrosion protection through specialized inhibitor packages. They are essential for protecting industrial machinery, HVAC systems, and internal combustion engines from thermal expansion damage and oxidative degradation.
Common Applications
- HVAC Chiller Systems: Use of inhibited ethylene glycol at 30-50% concentrations to prevent burst pipes and scale accumulation in commercial cooling towers.
- Data Center Liquid Cooling: High-purity heat transfer fluids utilizing OAT (Organic Additive Technology) to protect sensitive cold plates and manifolds in AI GPU clusters.
- TIG Welder Cooling: Specialized 50/50 ethylene glycol mixtures designed to prevent pump cavitation and electrolytic corrosion in welding torches.
- Solar Thermal Loops: Propylene glycol formulations used as primary heat transfer media in residential and industrial solar water heating systems.
- Heavy Equipment Cooling: Heavy-duty antifreeze meeting ASTM D6210 standards for cavitation protection in wet-sleeve diesel liners.
- Food & Beverage Processing: Propylene Glycol USP grade used in secondary cooling loops where incidental food contact may occur, ensuring compliance with FDA safety standards.
- Blockchain Infrastructure: Immersion and cold-plate cooling for ASIC miners to maintain optimal clock speeds and thermal stability.
What We Carry
We provide a comprehensive range of glycol-based coolants in concentrations from 100% concentrate to pre-diluted 50/50 and 60/40 solutions. Our inventory includes industrial, inhibited, USP, and semiconductor grades to meet specific resistivity and purity requirements.
| Grade | Purity / Type | Best For |
|---|---|---|
| Ethylene Glycol Inhibited | Industrial w/ Inhibitors | HVAC, Chillers, Heavy Duty Diesel |
| Propylene Glycol USP | 99.9% / Food Grade | Food Processing, Pharmaceuticals, HVAC |
| Semiconductor Grade | Ultra-High Purity | Electronic Etching, AI Hardware Cooling |
| Ethylene Glycol Technical | 99.0% Uninhibited | Chemical Manufacturing, De-icing Base |
Available packaging sizes include 1-gallon bottles, 5-gallon pails, 55-gallon poly drums, and 275-gallon IBC totes for bulk industrial requirements.
Safety & Handling
Ethylene Glycol is classified under GHS07 (Exclamation Mark) and GHS08 (Health Hazard) due to acute oral toxicity and target organ effects if ingested. Propylene Glycol is generally recognized as safe (GRAS) but should still be handled with standard industrial hygiene practices. Operators must wear nitrile gloves and splash-resistant safety goggles as per OSHA 29 CFR 1910.1200 requirements.
Storage should occur in a cool, well-ventilated area away from strong oxidizers and acids. Bulk storage of Ethylene Glycol is subject to EPA RCRA regulations if spilled, and quantities exceeding 5,000 lbs fall under DOT 49 CFR hazardous substance reporting (Reportable Quantity). In the event of exposure, flush eyes with water for 15 minutes and seek medical attention immediately if swallowed. Refer to our Safety Data Sheets for specific regional disposal guidelines.
Sourcing & Quality
Shipped from Taylor, Texas — same-day on in-stock items.
COA included with every order. Certificate of Analysis documents lot-specific purity and specifications.
28 years serving 55,000+ customers including 244 federal contracts.
✓ SDS Included ✓ COA Available ⚡ Same-Day Shipping ★ No Minimum Order
Last updated: March 2026
Frequently Asked Questions
What is the difference between ethylene glycol and propylene glycol for industrial heat transfer?
Ethylene glycol (CAS 107-21-1) offers superior heat transfer efficiency and lower viscosity at low temperatures, making it the standard for most industrial HVAC and automotive applications. Propylene glycol (CAS 57-55-6) is significantly less toxic and is required in food processing, pharmaceutical manufacturing, or any application where incidental contact with groundwater or consumer products is possible. While ethylene glycol is more efficient, propylene glycol is often mandated by local environmental regulations for burst protection in sensitive areas.
Why must I use inhibited glycol instead of technical grade in a chiller?
Uninhibited or 'technical' glycol is naturally corrosive to metals like copper, steel, and aluminum because it becomes acidic over time as it oxidizes. Inhibited glycols contain buffers and passivating agents that maintain a stable pH (typically between 8.0 and 10.0) and create a microscopic protective film on metal surfaces. According to ASTM D1384 standards, inhibited fluids significantly reduce the rate of galvanic corrosion and scale buildup, extending the lifespan of heat exchangers and pumps.
What is the freezing point of a 50/50 ethylene glycol water mix?
A 50/50 volume-to-volume mixture of ethylene glycol and deionized water provides freeze protection down to approximately -34°F (-37°C). Increasing the concentration beyond 60% actually reduces the freeze protection capability; for example, 100% pure ethylene glycol freezes at approximately 9°F (-13°C). For maximum freeze protection in extreme climates, a 60/40 mix is recommended, which provides protection down to -60°F (-51°C).
What are the OSHA requirements for glycol safety labeling?
Under OSHA 29 CFR 1910.1200 (Hazard Communication Standard), all glycol containers must be labeled with appropriate GHS pictograms, including GHS08 for ethylene glycol due to its specific target organ toxicity (STOT). Employers are required to maintain current Safety Data Sheets (SDS) and provide training to employees regarding the ingestion hazards and proper PPE. NFPA 704 labeling for ethylene glycol typically carries a Health rating of 2, Flammability of 1, and Instability of 0.
How should spent industrial coolant be disposed of according to EPA regulations?
Spent glycol coolants are not listed as hazardous waste under EPA RCRA (40 CFR Part 261) in their pure state, but they often become hazardous during use due to the accumulation of heavy metals like lead, copper, or chrome from the cooling system. Generators must perform a waste determination to see if the spent fluid exceeds TCLP limits for these metals. Ethylene glycol also has a federal Reportable Quantity (RQ) of 5,000 pounds; spills exceeding this amount must be reported to the National Response Center (NRC).
Does propylene glycol USP grade meet food safety standards?
Yes, Propylene Glycol USP (United States Pharmacopeia) grade meets or exceeds the requirements of the Food Chemicals Codex (FCC) for purity. It is suitable for applications involving incidental food contact, such as immersion freezing of packaged foods or secondary cooling in breweries and dairies. Our USP grade propylene glycol is 99.9% pure and is produced in accordance with Current Good Manufacturing Practices (cGMP).
How often should I test the inhibitor levels in my heat transfer fluid?
Industrial heat transfer fluids should be tested at least annually to monitor pH, reserve alkalinity, and inhibitor concentration. A pH drop below 8.0 indicates the glycol is beginning to degrade and acidify, which can lead to rapid system corrosion. We recommend using a refractometer to verify glycol-to-water ratios, as hydrometers can be inaccurate due to temperature variations.
What is the shelf life of inhibited glycol concentrates?
Inhibited glycol concentrates typically have a shelf life of 2 years when stored in original, unopened containers in a cool, dry environment. Once diluted with water, the shelf life of the inhibitors depends on the quality of the source water and the system's operating temperature. Using deionized or distilled water for dilution is critical, as minerals in tap water can react with the inhibitor package and cause premature fluid failure.
Are there DOT restrictions for shipping ethylene glycol?
Ethylene glycol is not regulated as a DOT hazardous material for ground transport in non-bulk packages (e.g., pails or drums) unless the quantity per container exceeds the Reportable Quantity of 5,000 pounds. For bulk shipments, such as tankers or large IBC totes reaching that weight threshold, the material must be shipped as 'UN3082, Environmentally hazardous substance, liquid, n.o.s. (Ethylene Glycol), 9, PG III'.
Guides & Resources
Data Center Glycol Inhibitor Chemistry Guide | OAT vs NOAT vs HOAT
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Complete Guide to Winter Vehicle Antifreeze & Coolant Selection
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Maintaining Peak Cooling Performance: Ethylene Glycol (Inhibited) in HVAC Chillers
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AI GPU Cooling Revolution: Deionized Water, Ethylene Glycol & Propylene Glycol – The Ultimate Liquid Cooling Guide
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The Engineer's Guide to Ethylene Glycol for Heat Transfer Systems
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