Product Overview
100% Propylene Glycol Inhibited is an undiluted, corrosion-inhibited glycol base used across HVAC, chiller, and industrial heat transfer systems. Supplied at full concentration for dilution with deionized water, it gives the operator complete control over dilution ratio — mix it to the exact freeze-protection point your system requires. The inhibitor package protects ferrous and non-ferrous metals in closed-loop circuits, extending fluid life and reducing maintenance intervals compared to uninhibited glycol. It contains a nitrite-containing hybrid organic-acid corrosion inhibitor package and is not dyed. Dilute with deionized water for closed-loop heat-transfer service.
This product is available to order from Alliance Chemical in sizes ranging from 1-quart bottles through 330-gallon totes, scaling from small evaluations to full system fills.
Why This Concentration
This is the undiluted inhibited concentrate — the starting point from which every lower dilution is made. Buyers who need a specific freeze point, a particular glycol-to-water ratio for a chiller loop, or a custom blend for a heat transfer circuit start here and dilute on-site. One drum of 100% replaces multiple pre-mixed SKUs and lets your team adjust the ratio seasonally or per-system.
If your application calls for a fixed, pre-diluted ratio and you want to eliminate on-site mixing, Alliance Chemical also offers ready-to-use concentrations: 30% Propylene Glycol Inhibited for moderate climates and light freeze protection, 40% Propylene Glycol Inhibited for standard HVAC loops, and 50% Propylene Glycol Inhibited for colder-climate systems that need lower freeze points. The 100% product is the right choice when you control the dilution, need maximum flexibility, or are filling a large system where shipping water adds unnecessary freight cost.
The "inhibited" designation means this glycol contains a corrosion-inhibitor additive package. Plain, uninhibited propylene glycol will degrade over time in a metal loop, forming acidic byproducts that attack copper, solder joints, and steel. The inhibitor buffers that degradation. For any closed-loop fluid application — chillers, hydronic heating, solar thermal collectors — the inhibited version is the correct procurement choice.
Chemical Profile
100% Propylene Glycol Inhibited is 95.6–96.4% propylene glycol by weight with a 3.6–4.4% nitrite-containing hybrid organic-acid corrosion inhibitor package (4.0% nominal; nitrite at least 2,400 ppm as NO2) and no added water. Propylene glycol (CAS 57-55-6, C₃H₈O₂, 76.09 g/mol) is a diol that is fully miscible with water. The concentrate is a clear, colorless to pale yellow, viscous liquid with a specific gravity of about 1.04 at 20 °C. The inhibitor dilutes with the glycol, so dilute by weight to at least 25% glycol; the Technical Data Sheet gives the dilution table. pH and reserve alkalinity are reported on each lot's Certificate of Analysis.
Industrial Applications
100% Propylene Glycol Inhibited is a closed-loop heat-transfer concentrate:
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Heat transfer fluid. The primary industrial use. Propylene glycol's thermal stability, low vapor pressure, and full water miscibility make it a standard heat transfer medium in closed-loop HVAC systems, process chillers, and industrial cooling circuits. The inhibitor package adds metal-surface protection that extends fluid service life in these systems.
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Antifreeze base. Diluted to the required ratio, inhibited propylene glycol lowers the freeze point of cooling and heating loops. It is the glycol of choice where lower toxicity relative to ethylene glycol is a design requirement.
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Not for food or potable-water service. This inhibited concentrate is not USP/NF grade and is not for food-contact, incidental-food-contact or potable-water systems; for those uses choose Propylene Glycol USP Grade.
Handling & Storage
Propylene glycol is not classified as hazardous under GHS based on available data (per the product's GHS classification). No signal word, pictograms, or hazard statements are assigned. That said, standard industrial hygiene applies: wear chemical-resistant gloves and safety goggles during transfer and mixing. The liquid is viscous at room temperature and slippery on hard floors — contain spills promptly.
Store in a cool, dry area away from direct sunlight and heat sources. HDPE drums, IBC totes, and glass containers are compatible. Keep containers sealed to prevent moisture absorption — propylene glycol is hygroscopic and will draw water from ambient air, which changes the effective concentration. Avoid contact with strong oxidizing agents and strong acids. Maintain adequate ventilation in enclosed storage areas, though vapor pressure is low enough that significant vapor accumulation under normal conditions is unlikely.
The product is thermally stable under normal storage conditions. No special temperature-controlled storage is required for the neat glycol, but avoid prolonged storage above 100 °F; heat can accelerate oxidative degradation and deplete the inhibitor package.
Hazmat & Shipping
100% Propylene Glycol Inhibited is not regulated as a hazardous material for transport (per 49 CFR 172.101). No UN number, hazard class, packing group, or proper shipping name is assigned. Standard ground, air, and ocean freight classifications apply — no DOT hazmat shipping papers are required for this product.
All shipping guidance for this product has been reviewed by Andre Taki, DOT Hazmat Specialist.
Documentation
A Safety Data Sheet ships with every order of this product. SDS documents are available in English, Spanish, French, and Japanese. A Technical Data Sheet is also available for detailed product specifications. Lot-specific Certificates of Analysis are available on request, documenting the analytical results for your specific shipment.
Why Buy from Alliance Chemical
This product is available in sixteen size and packaging options — from a single quart for small evaluations up to 330-gallon totes for production-scale system fills — with SDS, TDS, and lot-specific COA documentation available across the full range. Alliance Chemical has served over 55,000 customers since 1998, operating from our warehouse at 204 S Edmond St, Taylor, Texas 76574. Product pages and shipping classifications are reviewed by Andre Taki, DOT Hazmat Specialist, so the regulatory detail you read here is the same detail that governs how we pack and ship your order.
