Denatured Alcohol Proof A vs Denatured Alcohol Proof C
Comprehensive comparison of Denatured Alcohol Proof A and Denatured Alcohol Proof C including physical properties, applications, safety considerations, and pricing. Alliance Chemical supplies both chemicals in various grades and concentrations.
Quick Comparison Summary
Denatured Alcohol Proof A
- CAS:
- Mixture
- Formula:
- C₂H₆O (Ethanol) with denaturants (e.g., methanol, isopropyl alcohol, methyl ethyl ketone, or others)
Denatured Alcohol Proof C
- CAS:
- Mixture
- Formula:
- C₂H₅OH (Ethanol) + Denaturants (e.g., Methanol)
Physical & Chemical Properties Comparison
| Property | Denatured Alcohol Proof A | Denatured Alcohol Proof C | Key Difference |
|---|---|---|---|
| Boiling Point | 78.37 °C (for pure ethanol) | 78-79°C (for ethanol, may vary slightly based on denaturants) | Similar boiling points |
| Flash Point ⚠️ | 13 °C (for pure ethanol) | 13°C (for ethanol, may vary slightly based on denaturants) | Similar flammability |
| Density | 0.789 g/cm³ (for pure ethanol at 20°C) | 0.79-0.81 g/cm³ (typical range, may vary slightly based on denaturants) | Similar density |
| Water Solubility | Miscible with water | Miscible with water | Both fully water soluble |
| pH | 7.0 (Neutral) | Not applicable | Denatured Alcohol Proof C is more acidic |
| Molecular Weight | 46.07 g/mol (for pure ethanol) | Varies | Denatured Alcohol Proof A is heavier molecule |
| Melting Point | -114.1 °C (for pure ethanol) | -114.1°C (for ethanol, may vary slightly based on denaturants) | Similar melting points |
| Vapor Pressure | 59 mmHg at 20°C (for pure ethanol) | 59 mmHg at 20°C (for ethanol, may vary slightly based on denaturants) | Similar volatility |
| Auto-ignition Temp ⚠️ | 363 °C (for pure ethanol) | 363°C (for ethanol, may vary slightly based on denaturants) | Similar auto-ignition temperature |
| Vapor Density | 1.6 (air = 1) (for pure ethanol) | 1.6 (air = 1) (for ethanol, may vary slightly based on denaturants) | Similar vapor density |
| Appearance | Clear, colorless liquid | Clear, colorless liquid | Similar appearance |
| Odor | Characteristic alcohol odor | Characteristic alcoholic odor |
Data sourced from PubChem (NIH), OSHA Technical Guidelines, and Alliance Chemical laboratory analysis. Last verified March 2026.
Applications & Use Cases
Denatured Alcohol Proof A Best For:
- Industrial solvent
- Laboratory reagent
- Cleaning agent
- Fuel additive
- Surface preparation
Denatured Alcohol Proof C Best For:
- Industrial solvent
- Laboratory reagent
- Cleaning agent
- Surface preparation
- Paint thinner
Choosing Between Them
The right choice depends on your specific application, required purity, and handling capabilities. Contact our team for guidance on which chemical best fits your needs.
Safety & Handling Comparison
Storage Requirements
Always store in original containers in a cool, well-ventilated area per NFPA 30 guidelines. Refer to each product's SDS for specific storage temperature ranges and incompatible materials.
PPE Requirements
At minimum: chemical-resistant gloves, safety goggles, and adequate ventilation per OSHA 29 CFR 1910.132-138. Check each SDS below for chemical-specific PPE requirements.
Fire Hazard
Both have similar fire hazard levels.
Safety Data Sheets (SDS)
Which Chemical Should You Choose?
Decision Snapshot
| Decision Factor | Better Fit | Why |
|---|---|---|
| Evaporation Profile | Tie | Similar boiling points indicate similar evaporation behavior. |
| Fire Safety Margin | Tie | Higher flash point generally reduces ignition risk in handling and storage. |
| Application Breadth | Tie | Compares distinct listed use cases to avoid generic recommendations. |
| Purity Flexibility | Standard grades | Based on availability of 99%+ concentration options in current product metadata. |
Choose Denatured Alcohol Proof A if:
- You specifically need support for fuel additive applications.
- You need dependable pack-size availability with COA/SDS documentation from one supplier.
Choose Denatured Alcohol Proof C if:
- You specifically need support for fuel applications.
- You need dependable pack-size availability with COA/SDS documentation from one supplier.
Commercial & Fulfillment Snapshot
Built for purchasing teams that need predictable dispatch, compliant documentation, and freight flexibility from parcel to full truckload.
| Procurement Advantage | Denatured Alcohol Proof A | Denatured Alcohol Proof C |
|---|---|---|
| Grade & Concentration Coverage | multiple concentration options by application with industrial/lab procurement support. | multiple concentration options by application with industrial/lab procurement support. |
| Packaging Depth | small packs through bulk freight quantities for parcel, pallet, and truckload planning. | small packs through bulk freight quantities for parcel, pallet, and truckload planning. |
| Dispatch SLA | Order by 1 PM CT (Mon-Thu) or noon CT Friday for same-business-day outbound from Taylor, TX. | Order by 1 PM CT (Mon-Thu) or noon CT Friday for same-business-day outbound from Taylor, TX. |
| Freight Optionality | UPS Ground for small packs plus LTL/FTL lanes through ABF, SEFL, Saia, XPO, and partner carriers. | UPS Ground for small packs plus LTL/FTL lanes through ABF, SEFL, Saia, XPO, and partner carriers. |
| Compliance Readiness | SDS ready now; COA/TDS support available pre-PO and post-order. | SDS available on request; COA/TDS support available pre-PO and post-order. |
| Bulk Procurement CTA | Request bulk quote or call (512) 365-6838. | Request bulk quote or call (512) 365-6838. |
Need Help Deciding? Our technical team can help you choose the right chemical for your specific application. Email sales@alliancechemical.com for expert guidance.
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Alliance Chemical supplies both Denatured Alcohol Proof A and Denatured Alcohol Proof C in various grades and package sizes.