Propylene Glycol Supplier | USP, Technical & Inhibited

About Propylene Glycol (PG)

Buy propylene glycol (PG, CAS 57-55-6) from Alliance Chemical in USP, Technical, and inhibited grades. This collection includes concentrates and premixed solutions for HVAC, food and beverage processing, cosmetics, heat-transfer systems, fog fluid, and industrial formulation.

Products In This Collection

This collection includes propylene glycol USP, technical-grade PG, inhibited PG, and premixed concentrations such as 20%, 30%, 40%, 50%, and higher-strength options. Inhibited grades include corrosion inhibitor packages for closed-loop cooling systems.

Common Applications

HVAC and geothermal loops: Inhibited PG provides freeze protection and corrosion control in closed-loop cooling and heat-transfer systems.
Food and beverage processing: USP-grade PG is used as a heat-transfer fluid and formulation ingredient where the grade is suitable.
Data center cooling: PG blends are used in liquid cooling and thermal management systems where lower toxicity than ethylene glycol is preferred.
Cosmetics and fog fluids: USP PG serves humectant, carrier, and fog-fluid applications when product grade and formulation requirements align.

Grade & Selection Notes

Choose USP-grade PG for food, cosmetic, pharmaceutical-adjacent, or sensitive applications where the specification requires it. Choose Technical Grade for industrial use. Choose inhibited PG for HVAC, geothermal, data center, or process cooling loops that need corrosion protection.

Safety & Handling

Propylene glycol has a lower toxicity profile than ethylene glycol, but it should still be handled with normal industrial hygiene practices. Verify grade suitability, material compatibility, and inhibitor chemistry before charging a system. Review the Safety Data Sheets before use and follow your site-specific handling procedure.

Why Buy From Alliance Chemical

Most in-stock propylene glycol orders ship in 1-2 business days. SDS and lot-specific COA support are available, including documentation for USP-grade orders.

Frequently Asked Questions

What is propylene glycol used for?

Propylene glycol is used in HVAC loops, food processing, cosmetics, fog fluids, heat-transfer systems, and industrial formulations.

What is the difference between USP and Technical Grade PG?

USP grade is selected when a USP specification is required. Technical Grade is used for industrial and process applications where USP is not required.

When should I choose inhibited propylene glycol?

Use inhibited PG in closed-loop systems where corrosion protection for metals such as copper, brass, steel, or aluminum is required.

Is propylene glycol safer than ethylene glycol?

Propylene glycol generally has lower toxicity than ethylene glycol, which is why it is often selected for sensitive HVAC, food processing, and facility applications.

Can propylene glycol be mixed with deionized water?

Yes, PG is commonly blended with deionized water for heat-transfer systems. Use verified freeze-point calculations and compatible inhibitors.

Propylene Glycol (PG)