Fluids, lubricants & process materials · Heat-transfer fluids
Propylene glycol
Propylene glycol is a process-fluid reference for thermal, hydraulic or lubrication screening. Concentration, additives, pressure, temperature and ageing must accompany properties.
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01
Overview
- Material class
- Fluids, lubricants & process materials
- Category
- Heat-transfer fluids
- Family
- Propylene glycol
- Product forms
- Bulk liquid
Composition
| Constituent | Min | Max | Typical | Note |
|---|---|---|---|---|
| Identity / formulation | C3H8O2 | Purity and additive package may vary |
02
Properties and conditions
Engineering properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Density | ~1035 at 20 °C | kg/m³ | Representative generic grade; verify supplier, condition and test method |
| Dynamic or kinematic viscosity | ~40–60 mPa·s at 20 °C | See condition | Representative generic grade; verify supplier, condition and test method |
| Thermal conductivity | ~0.20 | W/m·K | Representative generic grade; verify supplier, condition and test method |
| Indicative operating range | Mixture dependent | °C | Representative generic grade; verify supplier, condition and test method |
| Heat capacity | Temperature dependent | kJ/kg·K | Representative generic grade; verify supplier, condition and test method |
| Compatibility | Materials and concentration dependent | — | Representative generic grade; verify supplier, condition and test method |
Conditions
Representative clean fluid
Condition carried forward from the Phase 1 record.
03
Processing and use
Processing
- Viscosity, vapour pressure, oxidation, contamination and additive depletion must be evaluated at service temperature.
Applications
- Coolants and heat-transfer loops
- Hydraulic or lubrication systems
- Process equipment
Selection considerations
- A generic fluid-family record cannot replace a current supplier product datasheet or compatibility test.
04
Standards and related materials
Standards and designations
No standard designation is listed.
Other names
- PG
05
Sources and context
Sources
- NIST Chemistry WebBook — propylene glycolGovernment reference
- U.S. Nuclear Regulatory Commission materials resourcesApplication reference
Confirm the applicable specification, product form and condition before using values for design or procurement.
Supply and sustainability
Widely available, but additive packages and approvals are product specific.
Leak prevention, service life, reclaimability, toxicity and disposal route dominate environmental performance.
Strategic context
Critical to heat transfer, equipment reliability, energy efficiency and manufacturing stability.