Product Overview
100% Propylene Glycol Inhibited is an undiluted, corrosion-inhibited glycol base used across HVAC, chiller, and industrial heat transfer systems. Supplied as a laboratory grade product at full concentration, 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.
This product is available to order from Alliance Chemical in sizes ranging from 1-quart bottles through 330-gallon totes, scaling from lab and bench work to full production fills.
Why This Concentration
At 100% concentration, this is the neat propylene glycol base — 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
Propylene glycol (CAS 57-55-6, molecular formula C₃H₈O₂, molecular weight 76.09 g/mol) is a diol — a two-hydroxyl-group alcohol — that is fully miscible with water. In its neat form, it presents as a thick, colorless, practically odorless liquid. It is denser than water at 1.04 g/mL at 68 °F, so it will sink if added to a water surface. Solubility is high: greater than or equal to 100 mg/mL at 70 °F. Vapor pressure is low — 0.08 mmHg at 68 °F, rising to 0.13 mmHg at 77 °F — meaning minimal evaporative loss under normal ambient conditions, a practical advantage in open-top mixing and transfer operations.
Industrial Applications
100% Propylene Glycol Inhibited serves a range of fluid and solvent roles across industrial operations:
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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 — common in facilities with incidental-contact risk.
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Industrial solvent. Propylene glycol acts as a solvent and co-solvent in coatings, paints, and ink formulations, improving flow, leveling, and drying characteristics. Its hygroscopic nature helps control moisture in solvent systems.
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Humectant and carrier. In manufacturing processes that require moisture retention — certain textile treatments, paper coatings, or industrial formulations — propylene glycol functions as an effective humectant. It also serves as a carrier fluid for fragrances and active ingredients in industrial formulations.
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 exposure to temperatures above 150 °F, which 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 lab and bench evaluation 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 50,000 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.
