Product Overview
30% Propylene Glycol Inhibited is a pre-diluted, corrosion-inhibited glycol solution used as an antifreeze and heat transfer fluid in closed-loop HVAC systems, chillers, and boilers. It is a clear, colorless liquid supplied at 30% concentration and fully miscible with water. The inhibitor package is the point: it protects the metal wetted surfaces of pumps, piping, and heat exchangers that plain propylene glycol leaves exposed. Buyers are typically facilities and maintenance teams running hydronic heating loops, process chillers, and light-duty freeze-protection circuits who want a ready-to-use fluid rather than blending from concentrate.
Why This Concentration
30% is the working strength many operators land on for moderate freeze protection in conditioned spaces and mild climates: enough glycol to protect the loop, with less viscosity penalty and better heat transfer efficiency than higher concentrations. Because it arrives pre-diluted, there is no on-site blending step and no dilution-water quality question — you fill and go.
If your system sees harder freezes or you need more thermal headroom, step up to 40% Propylene Glycol Inhibited or 50% Propylene Glycol Inhibited. If you prefer to blend to a custom concentration with your own treated water, 100% Propylene Glycol Inhibited is the concentrate form of the same inhibited family. Choose 30% when the loop needs corrosion protection and moderate freeze protection without the pumping cost of a heavier fluid.
Chemical Profile
The active component is propylene glycol, CAS 57-55-6, formula C3H8O2, molecular weight 76.09. As supplied, this inhibited 30% solution is a clear, colorless liquid with an odorless to mild odor. Density runs 1.026–1.034 g/cm³, slightly heavier than water, and the fluid is miscible with water in all proportions — useful when topping off a loop or flushing a system. It is not classified as hazardous under GHS based on available data (per the product's GHS classification).
Industrial Applications
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Antifreeze for closed loops: lowers the freezing point of the circulating fluid in hydronic heating, snow-melt, and freeze-protection circuits so coils and piping survive cold-weather duty.
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Heat transfer fluid: carries heat in chillers, boilers, and process HVAC loops; the 30% strength keeps viscosity low so pumps move the fluid efficiently.
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Corrosion protection: the inhibitor package passivates metal surfaces in the loop, extending the service life of heat exchangers, pumps, and fittings compared with uninhibited glycol-water mixes.
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Humectant and process roles: propylene glycol is broadly used across industry as a moisture-retaining agent and process solvent; this inhibited Technical Grade formulation is intended for thermal-fluid service, so match the grade to the job.
Handling & Storage
This product carries no signal word and is not classified as hazardous under GHS based on available data (per the product's GHS classification). Standard industrial practice still applies: wear gloves and goggles when transferring, and ventilate enclosed work areas. Keep the fluid away from strong oxidizing agents. Store in a cool, dry area out of direct sunlight, in compatible containers — polyethylene and stainless steel both work well. Our team packs glycols in sealed, appropriate containers from the quart up to the tote; keep containers closed to protect fluid quality and prevent contamination.
Hazmat & Shipping
30% Propylene Glycol Inhibited has no UN number, no hazard class, no packing group, and no assigned proper shipping name — it is not regulated as a hazardous material for ground transport (per 49 CFR 172.101). We state the governed classification only; carrier services, fees, and delivery terms are set by the carrier at booking. From single quarts to 275 and 330 gallon totes, each pack ships as ordinary freight or parcel under that classification.
Documentation
A Safety Data Sheet (English) accompanies every order, and a lot-specific Certificate of Analysis is available for this product, along with a technical data sheet. If your receiving or EHS team needs documents before purchase, request them with your quote and we will send them ahead of the shipment.
Why Buy from Alliance Chemical
You can order this fluid at the scale you actually use it: quart and gallon packs for bench trials and small loops, 5, 15, and 55 gal drums for plant service, and 275–330 gallon totes for full-system fills — every size offered with SDS, TDS, and lot-specific COA support. Alliance Chemical has operated since 1998 and has served 50,000+ customers from our Taylor, Texas warehouse. Shipping and handling guidance on this page is reviewed by Andre Taki, DOT Hazmat Specialist. Order online today or request a quote for drum and tote pricing.
