Product Overview
50% Propylene Glycol Technical Grade is a clear, colorless liquid: propylene glycol (CAS 57-55-6) pre-diluted to 50% concentration in water. It is not classified as hazardous under GHS based on available data (per the product's GHS classification), which makes it one of the more straightforward industrial fluids we pack and ship from our Taylor, TX warehouse. Buyers use it as a heat transfer fluid in chiller and coolant loops, as an industrial solvent and carrier in coatings and formulation work, and as a humectant base. It is offered to order in sizes from 1 quart bottles for bench work up to 275 and 330 gallon totes for production systems.
Why This Concentration
A 50% dilution means the fluid arrives ready to circulate. You skip the on-site blending step, the DI water sourcing, and the mixing error that comes with cutting concentrate by hand. That matters for maintenance crews charging a glycol loop between shifts, and for formulators who want a consistent starting concentration batch to batch. Verify the concentration against your system's freeze-protection chart before charging — the right percentage depends on your lowest expected temperature, not on habit.
If your loop needs less glycol, 40% Propylene Glycol Technical Grade and 30% Propylene Glycol Technical Grade cover milder climates and lower-viscosity requirements at lower cost per gallon. If your purchasing spec calls out a USP designation — common in personal-care, flavor, and fragrance procurement — start with 30% Propylene Glycol USP Grade instead. Technical Grade is the workhorse designation buyers request for closed-loop coolant, antifreeze, and general industrial solvent duty.
Chemical Profile
This is a clear, colorless liquid with an odorless to mild odor. The 50% solution carries a density of 1.032–1.042 g/cm³, slightly heavier than water, and it is fully miscible with water — you can dilute it further in-line or in a mix tank without separation. The active component is propylene glycol, formula C3H8O2, molecular weight 76.09, CAS 57-55-6. Its hygroscopic character is what makes it useful as a humectant and carrier; its heat capacity and freeze-point depression are what put it in chillers and heat transfer systems.
Industrial Applications
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Heat transfer and chiller coolant. Propylene glycol solutions circulate in closed-loop chillers, HVAC systems, and process cooling equipment, depressing the freeze point of the loop and carrying heat between the process and the exchanger. Note this product is uninhibited — if your system spec calls for corrosion inhibitors, confirm whether an inhibited formulation is required before charging.
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Antifreeze duty. The same freeze-point depression makes 50% propylene glycol a common charge for seasonal freeze protection in idle lines and equipment. Match the concentration to your lowest expected ambient temperature using a freeze-protection chart.
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Solvent for paints and coatings. As a slow-evaporating industrial solvent, propylene glycol improves flow, leveling, and open time in waterborne coating formulations.
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Humectant and carrier. Formulators use propylene glycol as a moisture-retaining humectant and as a carrier for flavors and fragrances. For those workflows, purchasing departments typically specify a USP designation rather than Technical Grade — see the related USP product above.
Handling & Storage
This product carries no signal word and no hazard statements; it 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, work with ventilation, and keep the fluid away from strong oxidizing agents. Store it in a cool, dry area out of direct sunlight in compatible containers — polyethylene and stainless steel both hold up well. The material is stable in storage and, being fully water-miscible, cleans up from spills with water. This handling guidance is reviewed by Andre Taki, DOT Hazmat Specialist.
Hazmat & Shipping
50% Propylene Glycol Technical Grade is not regulated as a hazardous material for transport (per 49 CFR 172.101). It carries no UN number, no hazard class, no packing group, and no proper shipping name. From an operations standpoint, that means we pack and ship it as ordinary freight — from single quarts by parcel up to drums and 275 or 330 gallon totes moving by pallet. Confirm any carrier-specific requirements with your receiving dock as you would for any liquid freight.
Documentation
A Safety Data Sheet (English) accompanies every order, and a Technical Data Sheet is available for spec review before you buy. A lot-specific Certificate of Analysis is also available, so your QC lead can tie the container on your dock to the assay data for that lot. If your quality system requires documents up front for supplier approval, request them with your quote.
Why Buy from Alliance Chemical
This product is offered across the full packaging ladder — 1 quart, 1 gallon, 5 gallon, 15 gallon, 55 gallon drums, and 275 and 330 gallon totes — so you can trial a gallon on the bench and scale the same fluid to a tote-fed system without changing suppliers, with SDS and lot-specific COA documentation on every order. Alliance Chemical has operated as an industrial chemical distributor since 1998 and has served more than 50,000 customers, shipping from our warehouse in Taylor, Texas. Product and shipping guidance on this page is reviewed by Andre Taki, DOT Hazmat Specialist.
