Product Overview
30% Propylene Glycol USP Grade is a pre-diluted aqueous solution of propylene glycol (CAS 57-55-6) at 30% concentration — a thick, practically odorless, colorless liquid that mixes freely with water. It suits buyers who want a working-strength glycol solution without diluting concentrate on site: heat-transfer and HVAC operators, formulators in cosmetic and personal-care work, and laboratory users preparing mobile phases or process solutions. The USP Grade designation is the version procurement teams request when their workflow calls for a pharmacopeia-grade descriptor rather than a technical-grade material.
Why This Concentration
At 30%, the dilution work is already done. You receive a consistent, ready-to-use solution instead of handling concentrate, metering water, and verifying the blend yourself — a real labor saving in daily glycol loop top-offs and small-batch formulation. The trade-off is freight efficiency: you are shipping water along with the glycol, so high-volume users who blend on site sometimes prefer stronger solutions. If your process tolerates a technical-grade material, 30% Propylene Glycol Technical Grade covers the same concentration at an industrial designation. If you need more glycol per gallon — deeper freeze protection or a stronger stock solution to dilute downward — step up to 40% Propylene Glycol Technical Grade or 50% Propylene Glycol Technical Grade.
Chemical Profile
This is a clear, colorless liquid solution of propylene glycol — formula C3H8O2, molecular weight 76.09, CAS number 57-55-6 — in water at 30% concentration. It is thick relative to water, practically odorless, and fully miscible: solubility is greater than or equal to 100 mg/mL at 70 °F. Density of the 30% w/w aqueous solution is 1.025 at 20 °C. Vapor pressure is low — 0.08 mmHg at 68 °F and 0.13 mmHg at 77 °F — which is why open handling produces little odor or vapor in a ventilated workspace. These are our published product data for this solution.
Industrial Applications
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Heat transfer and antifreeze service. Propylene glycol solutions circulate in closed heat-transfer loops and antifreeze formulations, where the glycol depresses the freezing point of the water it is blended with. A 30% solution is a common working strength for systems with moderate freeze exposure.
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Cosmetic and personal-care formulation. Propylene glycol functions as a humectant and carrier in cosmetic work, helping formulations hold moisture. Formulators specifying a pharmacopeia-grade descriptor typically source the USP-designated material.
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Pharmaceutical formulation solvent. Propylene glycol serves as a solvent and vehicle for active ingredients in formulation work; a pre-diluted 30% solution gives a repeatable starting point for solvent systems.
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Laboratory and analytical use. Glycol-water solutions appear in reversed-phase chromatography mobile phases and general bench solution prep, where a consistent pre-mixed concentration removes one variable from the method.
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Humectant service. Beyond cosmetics, propylene glycol's moisture-retention behavior makes it a standard humectant across industrial formulation work.
Handling & Storage
This solution is not classified as hazardous under GHS based on available data (per the product's GHS classification), and no signal word is assigned. That does not make it a zero-precaution material on our dock or yours: wear gloves and goggles when transferring, and work with ventilation to minimize inhalation exposure. Keep it away from strong oxidizing agents — the one incompatibility class that matters for glycols. Store in a cool, dry place out of direct sunlight, in compatible containers such as HDPE or glass. Sealed in original packaging, the solution is stable in ordinary warehouse conditions; its low vapor pressure means minimal loss or odor from a properly closed container. This handling guidance is reviewed by Andre Taki, DOT Hazmat Specialist.
Hazmat & Shipping
30% Propylene Glycol is not regulated as a hazardous material for transport: no UN number, hazard class, packing group, or proper shipping name is assigned (per 49 CFR 172.101). Our team packs DOT-regulated chemicals daily, so a non-regulated glycol solution is straightforward by comparison — standard closures, standard cartons, no hazmat-specific packaging class. Carrier services, routing, and any receiver-side paperwork remain matters between you and your carrier; we state only the governed transport classification.
Documentation
A Safety Data Sheet ships with every order, available in English, Spanish, French, and Japanese. A lot-specific Certificate of Analysis is available for the material you receive, and a Technical Data Sheet is available for spec review before you buy. If your receiving, QC, or regulatory team needs any of these documents ahead of purchase, request them and we will send current copies.
Why Buy from Alliance Chemical
We offer this solution across sixteen listed sizes — 1 quart bottles for bench and formulation work up through 1 gallon, 5 gallon, 15 gallon, and 55 gallon drums to 275 and 330 gallon totes — so a lab trial and the production order that follows come from the same distributor with the same documentation trail. Alliance Chemical has distributed industrial chemicals from Taylor, Texas since 1998, serving 50,000+ customers, and most in-stock orders ship in 1–2 business days from our Taylor warehouse. Every listing on this page is offered to order with SDS, COA, and TDS support, and the shipping and handling guidance above is reviewed by Andre Taki, DOT Hazmat Specialist.
