Industrial chemicals · Taylor, TXTechnical Data Sheet
Propylene Glycol 20% Inhibited
20%
- CAS number
- 57-55-6
- Structure
Structure · PubChem - Grade
- 20%
Identity & Composition
- Product Name
- Propylene Glycol 20% Inhibited
- Alliance Code
- propylene-glycol-20-inhibited
- Grade
- —
- Concentration
- 20%
- CAS Number
- 57-55-6PubChem
- Formula
- C3H8O2PubChem
- Molecular Weight
- 76.09PubChem
- Product Type
- Mixture
Specifications
| Test | Specification | Typical | Method | Source |
|---|---|---|---|---|
| Assay | 20.0 - 21.0 % w/w | 20.14 % w/w | — | Interpreted |
| Freeze point | 19.2 °F (-7.1 °C) max | 19.1 °F (-7.2 °C) | ASTM D1177 | Interpreted |
| Total hardness of dilution water | < 100 ppm as CaCO3 | 0.33 ppm as CaCO3 | ASTM D1126 | Interpreted |
| Dipropylene glycol (DPG) | 0.1 wt% max | 0.039 wt% | GC area % (ASTM E202) | Interpreted |
| Reserve alkalinity | ≥ 2.0 mL at 20 wt % propylene glycol | 2.4 | ASTM D1121 | Interpreted |
| Acidity as Acetic Acid | 0.001 % max | 0.00024 % | — | Interpreted |
| Chlorides as Cl | 0.52 ppm max | 0.064 ppm | — | Interpreted |
| Heavy Metals as Pb | 1 ppm max | 0.048 ppm | — | Interpreted |
| Iron | 0.21 ppm max | 0.025 ppm | — | Interpreted |
| ash | 0.001% max | 0.00011 % | — | Interpreted |
| Appearance | Pass | Passes test | — | Interpreted |
| Suspended Matter | Pass | Passes test | — | Interpreted |
| Composition | 20 % propylene glycol in deionized water with the OAT inhibitor package, by weight | Conforms | By formulation; confirmed by specific gravity | Interpreted |
Values are reproduced from the current product reference. Source labels do not by themselves establish a supplier guarantee or a test result for your lot. Confirm applicable acceptance limits and request lot-specific documentation.
Available GradesSame CAS, alternate grades and concentrations
| Grade | Concentration | Typical Assay | SKU | TDS |
|---|---|---|---|---|
| This grade — | 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 → |
| Technical | 20% | — | propylene-glycol-20-technical-grade | View TDS → |
| USP | 20% | — | propylene-glycol-20-usp-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 yellow liquid (not dyed) | Adjudicated |
| Color | 10 APHA (maximum) | Interpreted |
| Odor | Mild, characteristic | Adjudicated |
| pH | Typically 7.0-9.0 (ASTM D1287); measured value reported on the lot Certificate of Analysis | Adjudicated |
| Specific Gravity | 1.017-1.025 (20 °C), calculated from formulation | Adjudicated |
| Density | approx. 1.02 g/mL (8.5 lb/gal) at 20 °C | Adjudicated |
| Boiling Point | approx. 101 °C (214 °F) at 760 mmHg | Adjudicated |
| Melting Point | Freeze point approx. -7 °C (19 °F) at 20 wt% propylene glycol | Adjudicated |
| Flash Point | Not flammable (aqueous solution) | Adjudicated |
| Solubility (water) | Miscible with water | Adjudicated |
Regulatory & Transport
DOT / 49 CFR
- UN Number
- Not regulatedAdjudicated
- Hazard Class
- Not regulatedAdjudicated
- Packing Group
- Not regulatedAdjudicated
- Proper Shipping Name
- Not regulatedAdjudicated
GHS / OSHA HCS 2024
- Signal Word
- Not regulatedAdjudicated
- H-Codes (Hazard Statements)
- Not applicableECHA C&L Inventory
- P-Codes (Precautionary Statements)
- Not applicableECHA C&L Inventory
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: 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% Inhibited. Every file included is SHA-256 hashed and listed in a manifest your QA team can audit.
Application Guidance
Propylene Glycol 20% Inhibited 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
Verify concentration against the required freeze and burst protection, and confirm elastomer and metallurgy compatibility for the service temperature. Only a USP or food-grade propylene glycol is suitable where incidental food or potable contact is possible; inhibited grades are for closed-loop heat-transfer service only.
Storage & Handling
- Recommended Storage
- Keep closed in a cool place away from oxidizers. Protect from freezing below the rated freeze point. Stainless steel, carbon steel, polyethylene or polypropylene containers.Adjudicated
- Handling Precautions
- Chemical-resistant gloves and splash goggles. 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 oxidizing agents; strong acids; strong bases.Adjudicated
- 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.
A package holding 25,000 lb (11,350 kg), about 2,920 US gal, or more of this product contains a reportable quantity (RQ) and ships as:
UN3082, Environmentally hazardous substance, liquid, n.o.s. (Sodium nitrite), 9, III, RQ
Confirm against shipping documents and carrier requirements before tender.
Revision History
Last reviewed 2026-06-17 by Andre Taki, Chief Commercial Officer, DOT Hazmat–certified (49 CFR 172.704).
| Version | Date | Change | Trigger |
|---|---|---|---|
| 1.5 | 2026-10-13 | Canonical data updated: 4 fields changed via the provenance/adjudication pipeline.
| canonical_change |
| 1.4 | 2026-09-24 | Canonical data updated: 1 field changed via the provenance/adjudication pipeline.
| canonical_change |
| 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.