A gallon of ethylene glycol weighs about 9.29 pounds (4.22 kg) at 68 °F. That is roughly 11% heavier than water, which weighs 8.345 lb per gallon. The number comes from ethylene glycol’s density of 1.1135 g/cm³ at 20 °C. A full 55-gallon drum of 100% ethylene glycol therefore holds about 511 lb of product, before container tare.

What is the density of ethylene glycol?

Ethylene glycol (MEG, CAS 107-21-1) has a density of 1.1135 g/cm³ at 20 °C. PubChem (CID 174) also lists a bulk density of 9.31 lb/gal measured at 15/15 °C (60 °F). Both values describe the same fluid at different reference temperatures, which is why published figures land between 9.29 and 9.31 lb per gallon.

Physical constants above are from PubChem CID 174.

How much does ethylene glycol weigh in each package size?

Net weights below use 9.29 lb per US gallon for 100% ethylene glycol. These are product weights only. Gross shipping weight adds the container tare, which is stamped on the drum or listed on the tote data plate.

Tank truck and rail car volumes vary by carrier and equipment. Use your carrier’s stated capacity when you calculate a load. For a container-size comparison across chemicals, see drum vs IBC tote vs bulk.

How do you convert ethylene glycol gallons to pounds?

Multiply gallons by 9.29 to get pounds. Multiply pounds by 0.1076 to get gallons. In metric, multiply liters by 1.1135 to get kilograms. One metric ton of ethylene glycol is about 237 US gallons.

• Gallons to pounds: gallons × 9.29 = lb
• Pounds to gallons: lb × 0.1076 = gallons
• Liters to kilograms: L × 1.1135 = kg
• Metric tons to gallons: MT × 237 = gallons

Our chemical density and volume calculator runs these conversions for ethylene glycol and the rest of the RightPath catalog.

Does temperature change ethylene glycol’s weight per gallon?

Yes. Liquids expand as they warm, so a gallon of warm ethylene glycol contains slightly less mass than a gallon of cold ethylene glycol. Between the two reference points PubChem publishes, the weight moves from 9.31 lb/gal at 60 °F to 9.29 lb/gal at 68 °F. Over normal warehouse temperatures the swing is small, but for custody transfer and tank gauging it matters: measure temperature and correct volume to a standard reference temperature before you invoice.

Do inhibited and aqueous glycol blends weigh the same?

No. Two things change the number:

• Water dilution lowers it. Water weighs 8.345 lb/gal, so any aqueous glycol blend — a 50/50 coolant, for example — weighs less per gallon than 100% ethylene glycol. The more water, the lighter the gallon.
• Inhibitor packages shift it slightly. Corrosion-inhibited glycols carry an additive package that changes density by a small amount relative to the uninhibited product.

For any diluted or inhibited grade, use the density printed on the certificate of analysis for that lot rather than the pure-component figure. Ethylene glycol is also frequently confused with propylene glycol, which is a different chemical with a different density — see propylene glycol vs. ethylene glycol.

What grades and sizes of ethylene glycol does RightPath stock?

RightPath Industries supplies ethylene glycol, low iron and chloride — a high-purity grade for heat transfer and specialty formulation — in bulk and small-package quantities with lot control. It sits in our glycols category alongside triethylene glycol and the glycol ether range. Current packaging availability is confirmed on your quote.

Before you handle it, review the storage, exposure and first-aid guidance in our ethylene glycol safety and properties guide and the product safety data sheet. Ethylene glycol is acutely toxic if swallowed.

How do you order ethylene glycol from RightPath?

Send the grade, the volume, the packaging you want, and the delivery ZIP code. RightPath Industries is a Pittsburgh-headquartered distributor carrying more than 8,000 chemicals, and quotes go out the same day. Request bulk pricing and we will come back with an all-in landed number, not a base price plus surprises.

Frequently asked questions

How much does a 55-gallon drum of ethylene glycol weigh?

A 55-gallon drum of 100% ethylene glycol holds about 511 lb (232 kg) of product. Gross weight adds the drum tare, which is stamped on the container.

Is ethylene glycol heavier than water?

Yes. Ethylene glycol weighs about 9.29 lb per US gallon versus 8.345 lb for water, making it roughly 11% heavier. It sinks in water and is fully miscible with it.

How much does a 275-gallon tote of ethylene glycol weigh?

A 275-gallon IBC tote of 100% ethylene glycol contains about 2,555 lb (1,159 kg) of product, plus the tote tare.

What is the specific gravity of ethylene glycol?

Ethylene glycol has a density of 1.1135 g/cm³ at 20 °C, which corresponds to a specific gravity of approximately 1.11 relative to water.

How many gallons of ethylene glycol are in a metric ton?

One metric ton (1,000 kg) of ethylene glycol is about 237 US gallons at 20 °C.

What is propylene glycol used for?

Propylene glycol (CAS 57-55-6) is used as a humectant, solvent, and carrier in food, pharmaceuticals, and cosmetics, and as a low-toxicity antifreeze and heat-transfer fluid in HVAC, deicing, and industrial systems. Because it is FDA-recognized as GRAS (generally recognized as safe) and available in USP, food, and technical grades, it appears in everything from processed foods to injectable medicines to engine coolants.

That versatility comes from a rare combination of traits: it dissolves both water- and oil-based ingredients, holds moisture, resists freezing, and has low toxicity. Below is a breakdown of where propylene glycol (PG) actually gets used, by industry, and how the grade you choose depends on the application.

What are the main uses of propylene glycol by industry?

Propylene glycol’s roles fall into two broad buckets: it either carries and preserves other ingredients (as a solvent and humectant) or manages heat and freezing (as a glycol coolant). The table maps the most common applications to the grade typically specified.

Grade guidance is general; confirm the specification required by your process and regulator.

Why is propylene glycol used in food?

Propylene glycol is an FDA-approved food additive used as a humectant, solvent, and preservative — it keeps baked goods and processed foods moist, dissolves flavors and colors so they distribute evenly, and helps extend shelf life. It is recognized as GRAS for many food uses. Food and beverage applications require USP or food-grade PG, not technical grade.

Why is propylene glycol used in pharmaceuticals and cosmetics?

In pharmaceuticals, propylene glycol is a workhorse solvent and excipient that dissolves active ingredients and stabilizes oral, topical, injectable, and ophthalmic products — it is a common carrier in lubricating eye drops — supporting consistent dosing. In cosmetics and personal care, propylene glycol is one of the most widely used humectants: it draws and holds moisture in lotions, creams, deodorants, makeup, and hair-care products, while its solvency carries fragrances and actives. Both uses call for USP-grade material.

Why is propylene glycol used as a humectant in skin and hair care?

A humectant attracts water and holds it in place, and propylene glycol does this while also thinning formulas and dissolving other ingredients. In skin care it keeps lotions and creams from drying out and improves spreadability; in hair care it helps conditioners and styling products retain moisture and stay stable. Its low toxicity and skin compatibility are why it appears so widely on personal-care ingredient lists.

Is propylene glycol a good antifreeze?

Yes — propylene glycol is the low-toxicity alternative to ethylene glycol antifreeze, which makes it the standard choice for HVAC loops, food-processing cooling, breweries, solar thermal systems, and aircraft/pavement deicing, where a leak or overspray could contact people, food, or the environment. It depresses the freezing point and transfers heat effectively, usually as an inhibited industrial-grade blend for corrosion protection.

Propylene glycol vs. ethylene glycol: what’s the difference?

Both are glycols used as antifreeze, but ethylene glycol is toxic if ingested, while propylene glycol has low toxicity and is food-safe in appropriate grades. Ethylene glycol offers slightly better heat transfer at lower cost; propylene glycol is chosen wherever toxicity, food contact, or environmental exposure is a concern.

What are the key properties of propylene glycol?

Verify against the current SDS and PubChem entry for propylene glycol (CID 1030).

What grades and sizes of propylene glycol does RightPath stock?

RightPath Industries supplies propylene glycol (CAS 57-55-6) in USP, food, and technical grades, so you can match the exact specification your application and regulator require. We fill from small packaging through rail car, with lot control available for tightly controlled processes.

See the full propylene glycol product page and browse related glycols in our catalog.

How do you order propylene glycol from RightPath?

Request a quote through the RightPath pricing form, call 888-255-2401, or email sales@rightpathind.com. Specify the grade (USP, food, or technical), packaging, and quantity, and we will cross-reference your current material, confirm availability, and can sequester and lot-control stock at one of our three U.S. warehouses for just-in-time delivery.

Request bulk pricing: Get a propylene glycol quote →

Frequently asked questions

Is propylene glycol safe?

Propylene glycol has low toxicity and is FDA-recognized as GRAS for many food uses, which is why it appears in food, pharmaceuticals, and cosmetics. Safety depends on using the correct grade (USP or food grade) for consumable applications and following the SDS for handling.

What is the difference between USP and technical grade propylene glycol?

USP grade meets United States Pharmacopeia purity specifications for food, pharmaceutical, and cosmetic use. Technical (industrial) grade is intended for non-consumable applications such as antifreeze, deicing, and resins, and should not be used where food or pharmaceutical purity is required.

Is propylene glycol the same as ethylene glycol?

No. They are different glycols. Propylene glycol has low toxicity and is used where food safety matters, while ethylene glycol is toxic if ingested and used mainly in automotive antifreeze.

What is propylene glycol used for in e-liquids?

Propylene glycol serves as an aerosol base fluid in e-liquids, carrying flavor and producing vapor. USP-grade PG is used for this application.

Does propylene glycol freeze?

Pure propylene glycol has a low freezing point and, when blended with water, sharply depresses the freezing point of the mixture, which is why it is used as antifreeze and in deicing and cooling systems.

What is the difference between propylene glycol and glycerin?

Both are humectants used in food, pharma, and cosmetics, but they are different molecules. Glycerin (glycerol) is thicker and sweeter and is often preferred in food and some skin care; propylene glycol is thinner, a stronger solvent, and better at carrying flavors and actives. Formulators often choose based on viscosity, solvency, and mouthfeel.

Where can I find the propylene glycol SDS?

RightPath provides a Safety Data Sheet with every propylene glycol order, covering handling, storage, and disposal for the specific grade you buy. Request it with your quote, and always follow the SDS rather than generic figures.

Sources & links: Propylene glycol product page · Glycols category · External authority: PubChem — Propylene glycol (CID 1030)

Ready to source? See our guide to buying propylene glycol in bulk, and for formulators, our breakdown of propylene glycol in skincare and hair products.