Propylene Glycol

This is a ready-to-use 30% aqueous solution of USP-grade propylene glycol (CAS 57-55-6), blended and delivered at a fixed 30% concentration so you can pour it straight into a system without further dilution. Propylene glycol is a low-toxicity glycol widely preferred over ethylene glycol for freeze and burst protection in systems where a safer fluid profile matters.

Because it arrives pre-mixed, there is no need to measure, add water, or verify mixing ratios on site. The solution is a clear liquid, slightly denser than water, and fully miscible with water.

• Concentration: 30% propylene glycol, balance water
• Base glycol grade: USP
• Form: clear, ready-to-use aqueous liquid

It is engineered for closed-loop heat-transfer service where dependable, meter-ready freeze protection is the priority.

This page features our 30% pre-diluted solution built on USP-grade propylene glycol — a ready-to-use working fluid, not a concentrate. USP refers to the quality of the base glycol used in the blend.

It sits inside a full family we stock: pre-mixes at 20%, 30%, 40%, 50%, and 60%, full-strength 100% propylene glycol, and each in your choice of USP grade, Technical grade, or inhibited versions with a corrosion-inhibitor package for closed loops. Pick the concentration by the freeze protection your climate demands, and the grade by what your process requires.

The 30% pre-mix contrasts with buying 100% glycol and diluting it yourself:

• No mixing errors: the ratio is fixed at the correct 30%, every batch
• Consistent water quality: blended with controlled water, avoiding the mineral contamination that tap water can introduce into a loop
• Meter-ready: pump or pour directly into the system with no on-site measuring

If you need deeper freeze protection for a colder climate, step up to a 40–60% pre-mix or buy the 100% concentrate and dilute to spec.

This 30% propylene glycol solution is used for freeze and burst protection in closed-loop systems where a low-toxicity glycol is preferred over ethylene glycol. It is a common choice wherever the heat-transfer fluid could contact or is adjacent to sensitive environments.

• HVAC and chilled-water loops requiring dependable freeze protection
• Geothermal ground-loop heat-pump systems
• Hydronic heating and radiant floor loops
• Food-facility-adjacent cooling where a low-toxicity glycol is favored over ethylene glycol
• RV, boat, and seasonal-property winterizing of plumbing and equipment

Propylene glycol is chosen over ethylene glycol in these settings specifically because of its lower toxicity profile, which reduces risk in occupied buildings and near food operations. The 30% concentration balances freeze protection against viscosity and pumping efficiency for typical moderate-climate service.

Store this 30% propylene glycol solution in its sealed original container, indoors, in a cool, dry, well-ventilated area away from direct sunlight. Propylene glycol solutions are stable and do not require special hazardous-storage arrangements, but keeping containers closed prevents contamination and evaporation of water from the blend.

• Keep drums and totes sealed when not dispensing
• Store away from strong oxidizers
• Protect from prolonged freezing to avoid slush formation in the container
• Use clean, compatible transfer equipment to avoid introducing contaminants

The solution is compatible with stainless steel, HDPE, and polypropylene. Avoid galvanized materials for long-term storage. If the fluid partially freezes into slush during cold storage, allow it to warm and remix before use; it does not separate permanently. Label any secondary containers clearly and reseal after each use.

An unopened, properly stored 30% propylene glycol solution typically remains usable for one to two years from date of manufacture, and often longer when kept sealed in a cool, dry location. Propylene glycol itself is chemically stable, so the practical limit comes from contamination and the condition of any corrosion inhibitors rather than breakdown of the glycol.

• Keep containers sealed to prevent contamination and water loss
• Inspect for clarity and expected color before use
• In service, monitor concentration and pH over time, since in-system fluid ages differently than sealed stock

Fluid already circulating in a loop should be checked periodically for glycol percentage and inhibitor condition, because contamination and heat exposure in service can shorten effective life. Sealed inventory that looks clear and normal is generally fine to use.

This 30% propylene glycol solution is a low-hazard industrial fluid, but standard handling precautions still apply. Wear safety glasses and chemical-resistant gloves, and avoid prolonged skin contact and eye exposure. Propylene glycol is valued for its low-toxicity profile relative to ethylene glycol, which is a key reason it is chosen for building and food-facility-adjacent systems.

As a roughly 70% water solution, the product is non-combustible as supplied and is not classified as a hazardous material for standard ground shipping.

• Use gloves and eye protection when transferring
• Clean up spills promptly; the fluid can make floors slippery
• Keep away from strong oxidizing agents

Consult the Safety Data Sheet (SDS) for complete first-aid, spill, and PPE guidance. No medical or ingestion use is intended or implied. This product ships in 1-2 business days.

This 30% propylene glycol solution is not classified as a hazardous material for standard ground transport and ships non-hazmat from Taylor, TX. As a water-based, low-toxicity glycol solution, it does not carry a DOT hazard class for typical quantities, simplifying both shipping and disposal.

Dispose of used fluid, spill residues, and contaminated materials in accordance with all applicable federal, state, and local regulations. Fluid drained from a system may contain dissolved metals, inhibitors, or other contaminants picked up in service, which can change its waste classification.

• Do not discharge to storm drains or surface water
• Contain spills with inert absorbent and collect for disposal
• Characterize used loop fluid before disposal, since in-service contamination affects its profile

Refer to the Safety Data Sheet for disposal considerations and use a licensed waste handler where required. This product ships in 1-2 business days.