Product Overview
Ethylene Glycol 30/70 is a pre-mixed blend of ethylene glycol and water, ready to charge directly into cooling loops, chiller circuits, and closed-loop heat-transfer systems without on-site dilution. The 30/70 ratio — 30 parts ethylene glycol to 70 parts water by volume — delivers freeze protection and thermal-transfer performance suited to moderate-climate installations and process systems where a lighter glycol load keeps viscosity low and pump efficiency high.
we distribute this blend in our Taylor, TX warehouse and ship it daily in sizes from single quarts up to 330-gallon totes. Every package leaves our dock DOT-compliant and labeled, with an SDS included. Buyers are typically facility engineers specifying chiller fill, HVAC contractors commissioning hydronic loops, fleet shops topping off engine coolant, and process operators running jacketed reactors or heat exchangers.
Why This Concentration
A 30/70 ethylene glycol blend sits at the lighter end of the glycol spectrum. That matters because glycol raises viscosity and lowers specific heat — the more glycol in the loop, the harder the pump works and the less heat each gallon carries. At 30%, you get meaningful freeze depression below the point where straight water would ice up and crack a coil, but you keep the fluid thin enough that flow rates and BTU transfer stay close to plain water. For most commercial HVAC systems in the southern half of the U.S., a 30% charge is the sweet spot: enough protection to survive an overnight cold snap or a chiller shutdown without risking burst tubes, without the viscosity penalty of a 50% fill.
If your system runs in a climate that routinely sees hard freezes well below 0 °F, or if your process demands a wider operating envelope, you may need a higher glycol concentration. When you only need burst protection — keeping the fluid from expanding enough to crack pipes, not necessarily keeping it liquid — 30% often covers it. The trade-off is straightforward: lower glycol means better heat transfer and lower pumping cost; higher glycol means deeper freeze protection.
Buying pre-mixed also eliminates a common source of field error. Diluting concentrated glycol on-site with tap water or inconsistent water quality introduces minerals, chlorides, and biological contaminants that accelerate corrosion. A factory-blended 30/70 mix arrives at a known ratio with controlled water quality, so the fluid goes into your loop ready to run.
Chemical Profile
Ethylene glycol has the molecular formula C₂H₆O₂ and a molecular weight of 62.07 g/mol. It is registered under CAS number 107-21-1. The neat compound is a clear, colorless, slightly viscous liquid with a faintly sweet odor and complete miscibility in water — which is why it blends so readily into water-based heat-transfer fluids. At a 30/70 dilution, the solution behaves closer to water in viscosity and density while retaining the glycol's freeze-point depression. Detailed physical properties for this specific blend ratio — including freeze point, boiling point elevation, specific heat, and viscosity at temperature — are documented in the product's Technical Data Sheet, available on request.
Industrial Applications
Ethylene Glycol 30/70 is used wherever a closed-loop system needs freeze protection or controlled heat transfer without the cost and viscosity of a higher glycol charge.
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HVAC and chiller systems. Hydronic heating and cooling loops in commercial buildings, data centers, and manufacturing plants use glycol blends to prevent freeze damage during shutdowns or cold-weather exposure. A 30% fill protects coils and piping while keeping flow rates efficient across the system's design load.
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Automotive and fleet coolant. Engine cooling systems run on ethylene glycol–water blends to transfer combustion heat to the radiator and prevent freeze-up in cold storage or winter operation. A 30/70 mix is a common top-off or full-fill ratio for fleets operating in moderate climates.
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Process heat transfer. Jacketed reactors, heat exchangers, and thermal baths in chemical processing and manufacturing use glycol solutions as the circulating medium. The 30/70 ratio keeps the fluid pumpable at lower temperatures without heavily penalizing the heat-transfer coefficient.
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Solar thermal systems. Closed-loop solar collectors circulate glycol blends to capture and transport thermal energy. A lighter glycol mix reduces pumping losses in systems where extreme freeze protection is not required.
Handling & Storage
Ethylene glycol carries a GHS signal word of Warning (per the product's GHS classification). The relevant hazard statements are:
- H302: Harmful if swallowed (per the product's GHS classification)
- H373: May cause damage to organs (kidneys) through prolonged or repeated exposure (per the product's GHS classification)
The swallowing hazard is serious — ethylene glycol is toxic if ingested, and its sweet taste makes accidental ingestion a real risk around untrained personnel or animals. Keep containers sealed and labeled. Any spill should be contained and cleaned promptly.
Wear chemical-resistant gloves (nitrile or butyl rubber) and splash-proof safety goggles when transferring or charging systems. In enclosed spaces or during drum pumping, ensure adequate ventilation. Avoid contact with strong oxidizing agents, which can react with glycol.
Store in original containers or HDPE/stainless-steel vessels, tightly closed, in a cool and dry area away from direct sunlight. Ethylene glycol solutions are hygroscopic and will absorb moisture if left open, which can alter concentration over time. Shelf life in sealed containers is excellent — the product does not degrade under normal storage conditions.
Hazmat & Shipping
Canonical transport status is not regulated. Review the current SDS and carrier requirements before shipment.
Documentation
A Safety Data Sheet (SDS) in English ships with every order. The SDS covers composition, hazard identification, first-aid measures, firefighting guidance, and exposure controls — everything your EHS team needs for site compliance.
A lot-specific Certificate of Analysis (COA) is available for this product. Request it at the time of order or contact us after delivery with your lot number.
A Technical Data Sheet (TDS) is also available, covering the physical and performance specifications for this blend ratio.
Why Buy from Alliance Chemical
We are a hazmat distributor, not a reseller with a drop-ship arrangement. This product sits in our warehouse in Taylor, Texas, and ships the day you order it. Every drum, pail, and tote is packaged by our team to DOT specification — correct UN packaging, proper markings, accurate shipping papers.
Shipping and handling guidance for this product is reviewed by Andre Taki, DOT Hazmat Specialist. That means your shipment arrives compliant, your carrier accepts it without delay, and your receiving dock has the paperwork it needs.
We carry sizes from single quarts for bench work and system top-offs all the way to 330-gallon totes for bulk plant fills — so you can scale your order to your actual need without minimum-order hassles. Hazmat surcharges may apply from our side. SDS and COA documentation included or available on request.
