Industrial chemicals · Taylor, TXTechnical Data Sheet
Propylene Glycol 20% USP GRADE
USP · 20%
Identity & Composition
- Product Name
- Propylene Glycol 20% USP GRADE
- Alliance Code
- propylene-glycol-20-usp-grade
- Grade
- USP
- Concentration
- 20%
- CAS Number
- 57-55-6PubChem
- Formula
- C3H8O2PubChem
- Molecular Weight
- 76.09PubChem
- Product Type
- mixture
Specifications
| Test | Specification | Typical | Method | Source |
|---|---|---|---|---|
| Assay | 19.0 - 21.0 %, by volume | 20.0 % | — | Interpreted |
| Propylene glycol concentration | 19.0 - 21.0 % v/v | 20.0 % | — | Interpreted |
| Dilution water | Purified Water USP; conductivity ≤ 1.3 µS/cm @ 25 °C | Passes test | USP <1231> / conductivity USP <645> | Interpreted |
| Acidity | not more than 0.04 mL of 0.10 N sodium hydroxide | 0.01 | USP monograph titration, 0.10 N NaOH | Interpreted |
| Microbial enumeration | TAMC ≤ 100 CFU/mL; TYMC ≤ 10 CFU/mL | Passes test | USP <61> | Interpreted |
| Chloride | 0.0015% max | 0.0000062 % | USP <221> | Interpreted |
| Heavy metals | 1 ppm max | 0.1 ppm | USP <231> | Interpreted |
| Iron | 0.11 ppm max | 0.01 ppm | HOC 0290 | Interpreted |
| Limit of Diethylene Glycol | 0.021% max | 0.00062 % | GC, flame ionization detector, 0.53-mm x 30-m fused-silica G43 column, 2,2,2-trichloroethanol internal standard | Interpreted |
| Limit of Ethylene Glycol | 0.021% max | 0.00041 % | GC, flame ionization detector, 0.53-mm x 30-m fused-silica G43 column, 2,2,2-trichloroethanol internal standard | Interpreted |
| Residue on ignition | 0.0016 wt% max | 0.0001 wt% | Ignition of 50 g, residue moistened with 0.5 mL sulfuric acid and ignited to constant weight | Interpreted |
| Sulfate | 0.0013% max | 0.0001 % | USP <221> | Interpreted |
| arsenic | 0.21 ppm max | 0.0041 ppm | — | Interpreted |
| dpg | 0.021 % max | 0.0062 % | — | Interpreted |
| pb | 0.21 mg/kg max | 0.0021 mg/kg | — | Interpreted |
| meg | 0.00021 % max | 0.0001 % | — | Interpreted |
| po | 0.00021 % max | 0.000041 % | — | Interpreted |
| tpg | 0.0062 % max | 0.0012 % | — | Interpreted |
| residue | 0.001 % max | 0.00021 % | — | Interpreted |
| Identification A (Infrared Absorption) | Infrared Absorption 〈197F〉 on undried specimen | Passes test | USP <197F> | Interpreted |
| Residual solvents | Pass | Passes test | USP <467> | Interpreted |
| Suspended matter | Pass | Passes test | HOC 0171 | Interpreted |
| Composition | 20 % propylene glycol / 80 % deionized water, by volume | Conforms | By formulation; confirmed by specific gravity | Interpreted |
| Freeze point | 18.7 °F (-7.4 °C) max | 18.7 °F (-7.4 °C) | ASTM D1177 | Interpreted |
Specification values are guaranteed limits. Typical values are representative of production lots and are not guaranteed. Lot-specific certificates of analysis ship with every order.
Available GradesSame CAS, alternate grades and concentrations
| Grade | Concentration | Typical Assay | SKU | TDS |
|---|---|---|---|---|
| This grade USP | 20% | — | current | current |
| — | 60% | — | propylene-glycol-60-inhibited | View TDS → |
| Technical | 60% | — | propylene-glycol-60-technical-grade | View TDS → |
| USP | 60% | — | propylene-glycol-60-usp-grade | View TDS → |
| USP Grade | 50% | — | 50-propylene-glycol-usp-grade | View TDS → |
| Technical Grade | 40% | — | 40-propylene-glycol-technical-grade | View TDS → |
| USP Grade | 40% | — | 40-propylene-glycol-usp-grade | View TDS → |
| — | 20% | — | propylene-glycol-20-inhibited | View TDS → |
| Technical | 20% | — | propylene-glycol-20-technical-grade | View TDS → |
| Technical Grade | — | — | propylene-glycol-technical-grade | View TDS → |
| USP Grade | — | — | propylene-glycol-usp-grade | View TDS → |
Typical assay shown is the rolling-window mean from the sibling product's most recent lots. Grade selection drives downstream end-use — verify the sibling grade matches your specification before substitution.
Physical & Chemical Properties
| Property | Value | Source |
|---|---|---|
| Appearance | Clear, colorless to pale liquid | Published reference |
| Color | 10 APHA (maximum) | Interpreted |
| Odor | Pass | Interpreted |
| pH | Essentially neutral (unbuffered blend) | Published reference |
| Specific Gravity (20 °C) | 1.022 (20 °C) | Published reference |
| Density | 1.022 g/mL at 20 °C | Published reference |
| Boiling Point | ~101 °C | Published reference |
| Melting Point | -7 °C (freeze / crystallization onset) | Published reference |
| Flash Point | Not flammable (aqueous solution) | Published reference |
| Solubility (water) | Miscible with water | Published reference |
Regulatory & Transport
DOT / 49 CFR
- UN Number
- Not regulatedAdjudicated
- Hazard Class
- Not regulatedAdjudicated
- Packing Group
- Not regulatedAdjudicated
- Proper Shipping Name
- Not regulatedAdjudicated
GHS / OSHA HazCom 2012
- Signal Word
- Not regulatedAdjudicated
- H-Codes (Hazard Statements)
- Not applicableECHA CLP Annex VI
- P-Codes (Precautionary Statements)
- Not applicableECHA CLP Annex VI
Occupational Exposure Limits
- OSHA PEL (29 CFR 1910.1000)
- —no canonical
- ACGIH TLV
- —no canonical
- NIOSH REL
- —no canonical
- NIOSH IDLH
- —no canonical
Transport descriptions reflect 49 CFR 172.101 lookup at time of publication. Sourced data: ECHA CLP Annex VI for harmonised classifications, NIOSH Pocket Guide for REL/IDLH, OSHA Z-Tables for PEL. Always verify against the latest regulatory text before shipment-critical decisions.
Supplier Qualification Packet
One zipped download containing the TDS, SDS, latest lot COA (when available), and a fresh Letter of Continuing Guaranty for Propylene Glycol 20% USP GRADE. Every file included is SHA-256 hashed and listed in a manifest your QA team can audit.
Application Guidance
Propylene Glycol 20% USP GRADE (USP) is a glycol-based heat-transfer and freeze-protection fluid. Concentration sets the freeze and burst protection; the inhibitor package sets how long the system stays protected from corrosion.
- Closed-loop heat transfer and process cooling
- Data-centre and chilled-water freeze protection
- HVAC hydronic loops and glycol makeup
- Freeze and burst protection for idle or seasonal systems
- Humectant and carrier applications (USP/food-grade propylene glycol only)
Verify concentration against the required freeze and burst protection, and confirm elastomer and metallurgy compatibility for the service temperature. Ethylene glycol is toxic by ingestion and must not be used where incidental food or potable contact is possible — specify a propylene glycol grade for those services.
Storage & Handling
- Recommended Storage
- Cool, dry, well-ventilated area in tightly sealed original containers. Neat glycols are combustible liquids with high flash points (roughly 99–111 °C) and do not require a solvent store; aqueous blends will not sustain combustion. Protect inhibited coolants from contamination and from freezing below their stated protection point.Class-level guidance — not product-specific; the SDS controls.
- Handling Precautions
- Chemical-resistant gloves and splash goggles. Ethylene glycol grades are toxic by ingestion and must be kept away from food, drink and animals; propylene glycol grades are not. Avoid contact with hot surfaces and hot process equipment. Inhibitor packages deplete in service — monitor rather than top up blindly.Class-level guidance — not product-specific; the SDS controls.
- Incompatibilities
- Strong oxidizers, strong acids and strong bases. Galvanized (zinc) surfaces are attacked by many inhibited coolant packages. Verify elastomer and gasket compatibility for the service temperature; EPDM is standard for glycol/water service.Class-level guidance — not product-specific; the SDS controls.
- Shelf Life
- Consult Technical Services for product-specific shelf life
For full hazard, PPE, and emergency response guidance, refer to the Safety Data Sheet (SDS) for this product. The SDS controls in all cases where guidance differs.
Packaging & Logistics
Shipping Description (US DOT)
Not regulated for transport.
Confirm against shipping documents and carrier requirements before tender.
Revision History
Last reviewed 2026-06-17 by Andre Taki, DOT Hazmat Specialist.
| Version | Date | Change | Trigger |
|---|---|---|---|
| 1.3 | 2026-09-09 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.2 | 2026-07-24 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.1 | 2026-06-17 | Canonical data re-verified: 3 fields updated against independent vendor SDSs, CLP Annex VI, 49 CFR, and OSHA HazCom 2024 (GHS classification, hazard/precautionary codes, signal word, physical properties as applicable).
| canonical_change |
| 1.0 | 2026-05-20 | Initial URL-first TDS published from canonical chemistry registry. | initial |
This Technical Data Sheet is provided for technical reference. The Safety Data Sheet (SDS) controls in all cases where guidance differs. Values reflect Alliance Chemical canonical data at time of generation; subsequent revisions are recorded in the Revision History above.