Product Overview
50% Propylene Glycol Inhibited is a pre-mixed, water-based heat transfer fluid: propylene glycol (CAS 57-55-6) blended at 50% concentration with a corrosion inhibitor package. It arrives ready to charge into a system — no on-site dilution, no metering glycol against your water supply. Buyers use it as the working fluid in closed-loop HVAC systems, industrial chillers, and process cooling loops, and as an antifreeze where equipment sits through freezing conditions. It is not classified as hazardous under GHS based on available data (per the product's GHS classification), which simplifies handling compared with many of the fluids our Taylor, Texas team packs and ships every day.
Why This Concentration
50% is the workhorse concentration for inhibited propylene glycol. At this strength the fluid delivers strong freeze protection for most North American climates while keeping viscosity — and therefore pumping load — lower than concentrate diluted incorrectly on site. Because it ships pre-mixed, the inhibitor is already proportioned to the glycol content; you avoid the most common field error, which is diluting concentrate with hard or untreated water and stripping the inhibitor's effectiveness.
Match the concentration to your exposure. If your loop runs indoors in a milder climate and you mainly want burst protection with maximum heat transfer efficiency, look at 30% Propylene Glycol Inhibited or 40% Propylene Glycol Inhibited — thinner solutions move heat more efficiently. If you want to control the dilution ratio yourself, or you top off systems at varying strengths, 100% Propylene Glycol Inhibited gives you the concentrate and leaves the water chemistry to you. For a single fluid that covers deep freeze exposure without site mixing, 50% is the standard pick.
Chemical Profile
This Technical Grade inhibited formulation is a clear, colorless liquid with an odorless to mild odor. Density runs 1.04–1.05 g/cm³, noticeably heavier than water — a full 55-gallon drum reflects that, so plan drum handling equipment accordingly. The fluid is miscible with water in all proportions, which is what makes glycol loops forgiving to top off and flush. The base molecule is propylene glycol, formula C3H8O2, molecular weight 76.09, CAS 57-55-6.
Industrial Applications
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HVAC heat transfer fluid. Charged into hydronic heating and cooling loops, the 50% solution carries heat between boilers, air handlers, and coils while the inhibitor package protects wetted metal surfaces through service cycles.
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Industrial chillers and process cooling. In chiller circuits and jacketed process equipment, the fluid moves heat away from the load and keeps the loop liquid through low-temperature excursions.
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Antifreeze and freeze protection. In idle or seasonally exposed equipment — rooftop units, outdoor piping runs, fire-protection adjacent loops — the glycol fraction suppresses the freeze point and protects against burst damage.
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Corrosion inhibition in closed loops. The inhibitor package is the difference between this product and plain glycol-water: it is formulated to protect the metals in a circulating system over time, which is why operators specify an inhibited fluid rather than mixing their own.
Handling & Storage
This product carries no signal word; it is not classified as hazardous under GHS based on available data (per the product's GHS classification). Standard industrial practice still applies: wear appropriate PPE when transferring, keep adequate ventilation in storage areas, and avoid contact with strong oxidizing agents. Store cool and dry, out of direct sunlight, in compatible containers — HDPE and stainless steel are the common choices, and every package we fill ships in glycol-compatible packaging. Keep containers closed when not in use to protect the fluid and its inhibitor package from contamination; a contaminated charge is the fastest way to shorten a loop's service life.
Hazmat & Shipping
50% Propylene Glycol Inhibited is not regulated as a hazardous material for transport — it carries no UN number, hazard class, packing group, or proper shipping name (per 49 CFR 172.101). We state the governed classification only; carrier-specific services, routing, and any receiver paperwork are between you and your carrier. Our team packs quarts, gallons, pails, drums, and totes to the same standard as the regulated hazmat that moves through our Taylor, TX dock daily. Shipping and handling guidance on this page is reviewed by Andre Taki, DOT Hazmat Specialist.
Documentation
A Safety Data Sheet (SDS, English) ships with every order, and a Technical Data Sheet is available for engineering review. A lot-specific Certificate of Analysis (COA) is available on request, so your maintenance records tie the fluid in your loop to a specific production lot.
Why Buy from Alliance Chemical
We offer this fluid in the full range a glycol buyer actually needs — 1 quart samples for evaluation, 1 and 5 gallon containers for top-offs and small loops, 15 and 55 gal drums for plant maintenance, and 275 and 330 gallon totes for full system charges — each backed by SDS, TDS, and available lot-specific COA documentation. Alliance Chemical has operated since 1998 and has served 50,000+ customers, shipping from our warehouse at 204 S Edmond St, Taylor, Texas. You get a distributor that handles its own packing and hazmat logistics, not a drop-ship storefront.
