Product Overview
Propylene Glycol 40% Technical Grade is a pre-diluted aqueous solution of propylene glycol (C3H8O2, CAS 57-55-6) at a 40% concentration in water. It arrives ready to use — no on-site dilution, no mixing errors, no wasted labor. The solution is a clear, colorless liquid with little to no odor, fully miscible with water, and straightforward to handle in HVAC loops, closed systems, or batch processes.
This product carries its listed grade designation; confirm the lot-specific COA against your requirements. That makes it the right pick for facilities running heat-transfer systems, closed-loop chillers, antifreeze circuits, or general process work where pharmacopeial purity is unnecessary and cost matters.
we distribute this product in our Taylor, TX warehouse and ship it daily in containers from 1-quart bottles up to 330-gallon totes.
Why This Concentration
A 40% propylene glycol solution sits in a practical middle ground for freeze protection and heat-transfer work. It delivers meaningful freeze-point depression while keeping viscosity lower than higher-concentration blends — which directly affects pump energy, flow rates, and heat-exchanger efficiency in closed-loop systems.
If your system only needs mild protection or you operate in a warmer climate, a 30% Propylene Glycol Technical Grade solution will lower viscosity further and improve thermal conductivity. For harsher winter conditions or deeper freeze margins, step up to 50% Propylene Glycol Technical Grade.
Choosing the right concentration is a balance: higher glycol content extends freeze protection but increases viscosity and reduces heat-transfer rates. At 40%, most operators get adequate protection for moderate climates without overworking their pumps.
This is a technical grade product. If your application falls under food processing, pharmaceutical compounding, or any regulatory framework that requires USP-grade glycol, consider the 30% Propylene Glycol USP Grade instead. This product carries its listed grade designation; confirm the lot-specific COA against your requirements.
Chemical Profile
Propylene Glycol 40% Technical Grade is a clear, colorless liquid that is odorless to mild in character. It is fully miscible with water at all proportions, which makes dilution and system charging straightforward. The solution has a density of 1.02–1.04 g/cm³ — slightly denser than water, a useful indicator when checking concentration with a refractometer or hydrometer in the field. The parent compound has a molecular formula of C3H8O2 and a molecular weight of 76.09 g/mol. Its CAS number is 57-55-6.
Industrial Applications
Propylene glycol at this concentration is used across a range of industrial operations. Below are the most common.
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Heat Transfer and Antifreeze Systems — The primary use for a 40% propylene glycol solution is as a heat-transfer fluid in closed-loop HVAC systems, chillers, and process cooling circuits. It depresses the freezing point of the circulating fluid, protecting piping, coils, and heat exchangers from freeze damage during cold-weather shutdowns or in refrigerated environments.
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Industrial Solvent — Propylene glycol's solvency makes it a useful carrier and co-solvent in formulation work. At 40%, it provides moderate solvent strength while remaining easy to handle and dilute further in aqueous systems. Chemical manufacturers use it as a process intermediate and blending base.
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Humectant in Industrial Processes — Propylene glycol absorbs and retains moisture, which gives it a role in processes that require controlled humidity or moisture retention — such as certain textile treatments, paper manufacturing, and industrial coatings.
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Carrier Fluid — In industrial formulation, propylene glycol serves as a carrier for active ingredients, dyes, and additives. The 40% aqueous solution provides a lower-viscosity base than neat glycol, improving pumpability and dispersion in mixing operations.
Handling & Storage
This product is not classified as hazardous under GHS based on available data (per the product's GHS classification). No signal word, pictogram, or hazard statement is assigned. That said, standard industrial hygiene practices still apply.
Personal Protective Equipment: Wear chemical-splash goggles and chemical-resistant gloves (nitrile or butyl rubber) when handling. In poorly ventilated areas or during transfer operations that generate mist, use appropriate respiratory protection.
Storage: Store in a cool, dry area away from direct sunlight. Keep containers sealed when not in use. Compatible container materials include HDPE, polypropylene, and stainless steel. Avoid contact with strong oxidizing agents, which can degrade propylene glycol.
Spill Response: Propylene glycol solutions are slippery on hard surfaces. Contain spills promptly with absorbent material. The product is miscible with water and can typically be flushed to a sanitary sewer in small quantities — check local regulations for volume limits.
Shelf Life: When stored sealed in compatible containers out of direct sunlight, this product maintains its specification for an extended period. Contamination with foreign material or biological growth (in open systems) is the primary degradation risk.
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 — either printed in the box or provided electronically, depending on your preference. The SDS covers composition, hazard identification, first-aid measures, firefighting, accidental release, handling, exposure controls, and transport information.
A lot-specific Certificate of Analysis (COA) is available for this product, confirming that the material in your shipment meets its published specification. Request your COA at time of order or contact us after delivery with your lot number.
A Technical Data Sheet (TDS) is also available, summarizing the key physical and chemical properties for quick reference in your facility's documentation system.
Why Buy from Alliance Chemical
We are a hazmat chemical distributor operating out of Taylor, TX — not a marketplace reseller and not a drop-shipper. This product sits in our warehouse, packed and labeled, available to order the day you order it. Our shipping and handling guidance is reviewed by Andre Taki, DOT Hazmat Specialist, so every package leaves our dock with the correct container, the correct closure, and the correct documentation.
What that means in practice: your order ships under applicable requirements, arrives intact, and comes with real documentation — not a generic SDS pulled from a database. We handle propylene glycol in volumes from a single quart to 330-gallon totes, so whether you are running a bench test or charging a building loop, we have the right pack size in stock.
