Acetic Acid (50%) vs Buna-N Compatibility
Verified chemical resistance rating (Caution: Limited / Intermittent Service Only), thermal boundary limits (Ambient intermittent contact only; do not pressurize), and material specification guide for Buna-N exposed to Acetic Acid (50%) in Organic / Weak Mineral Acid service.
Acetic Acid (50%) vs Buna-N: C-Fair
Exposing Buna-N to Acetic Acid (50%) (Formula: CH3COOH (50% aq.), CAS: 64-19-7) carries an official rating of C-Fair (Caution: Limited / Intermittent Service Only). Maximum recommended thermal operating limit: Ambient intermittent contact only; do not pressurize. Best Grade A alternative materials for continuous or high-temperature service: Polypropylene, PTFE, EPDM, PVC.
Technical Specifications and Operating Parameters
| Chemical Medium | Acetic Acid (50%) |
|---|---|
| Chemical Formula | CH3COOH (50% aq.) |
| CAS Registry Number | 64-19-7 |
| Chemical Functional Class | Organic / Weak Mineral Acid |
| Wetted Material | Buna-N |
| Official Resistance Rating | C-Fair (Grade C) |
| Engineering Service Verdict | Caution: Limited / Intermittent Service Only |
| Max Temp and Concentration Limit | Ambient intermittent contact only; do not pressurize |
| Best Grade A Alternatives | Polypropylene, PTFE, EPDM, PVC |
| Backtest and Audit Verification | Verified against Cole-Parmer, ISM, Graco & CP Lab Safety industrial chemical resistance charts. |
Acetic Acid (50%) Cross-Material Comparison Matrix (9 Materials)
Direct benchmark ratings across all 9 reference industrial materials for Acetic Acid (50%):
| Material Name | Compatibility Rating | Service Verdict | Temperature Limit | Datasheet |
|---|---|---|---|---|
| Buna-N | C-Fair | Caution: Limited / Intermittent Service Only | Ambient intermittent contact only; do not pressurize | Report |
| EPDM | A1-Excellent | Safe for Continuous Industrial Service | Up to 120°F (49°C) verified; up to material thermal limit in non-pressurized service | Report |
| HDPE | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | Report |
| Polypropylene | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | Report |
| PTFE | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | Report |
| PVC | A1-Excellent | Safe for Continuous Industrial Service | Up to 120°F (49°C) verified; up to material thermal limit in non-pressurized service | Report |
| PVDF | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | Report |
| Stainless Steel | B1-Good | Acceptable with Routine Inspection | Up to 120°F (49°C) with minor absorption/corrosion allowance | Report |
| Viton | C-Fair | Caution: Limited / Intermittent Service Only | Ambient intermittent contact only; do not pressurize | Report |
Chemical and Material Interaction Analysis
Engineering Compatibility Verdict
Acetic Acid (50%) vs Buna-N: C – Fair (Moderate Effect / Not Recommended for Continuous Duty)
Summary Verdict: Buna-N (Nitrile / NBR Elastomer) is rated C-Fair (Caution: Limited / Intermittent Service Only) when exposed to Acetic Acid (50%) (Formula: CH3COOH (50% aq.), CAS: 64-19-7). Do not specify for primary containment or pressurized lines. Select an A-rated alternative from the comparison matrix below.
Quick Engineering Specifications
| Chemical Media | Acetic Acid (50%) |
|---|---|
| Chemical Formula | CH3COOH (50% aq.) |
| CAS Registry Number | 64-19-7 |
| Chemical Classification | Organic / Weak Mineral Acid |
| Wetted Material | Buna-N (Nitrile / NBR Elastomer) (Acrylonitrile-Butadiene Copolymer Elastomer) |
| Official Resistance Rating | C – Fair (Moderate Effect / Not Recommended for Continuous Duty) (Grade C) |
| Recommended Temperature Window | Ambient intermittent contact only; do not pressurize (Material limit: -40°F to 250°F (-40°C to 121°C)) |
| Top Grade-A Alternatives | Polypropylene, PTFE, EPDM, PVC |
| Data Verification Status | Verified against Cole-Parmer, ISM, Graco & CP Lab Safety industrial chemical resistance charts. |
Chemical & Material Interaction Analysis
Acetic Acid (50%) is classified as an organic / weak mineral acid (mild to moderate acidic hydrolysis and potential elastomer swelling). Used in food processing, pharmaceutical formulation, buffering, and industrial cleaning. When selecting wetted components for Buna-N, engineers must account for both concentration-dependent chemical attack and thermal stress:
- Reaction & Failure Mechanism: Triggers progressive mechanical degradation, plasticizer extraction, elastomeric swell, or localized corrosion over multi-day exposure.
- Material Profile (Buna-N): Workhorse elastomer for petroleum-based hydraulic oils, motor oils, diesel, gasoline, aliphatic hydrocarbons (hexane, heptane), water, and salt brines. However, poor resistance to ozone/weathering and rapidly destroyed by ketones, esters, chlorinated hydrocarbons, aromatic solvents, and strong oxidizing acids.
- Application Scope: Common wetted components include hydraulic O-rings, fuel transfer hoses, rotary shaft seals, oil gaskets, and general-purpose industrial pump elastomers.
Cross-Material Compatibility Comparison for Acetic Acid (50%)
To help you select the longest-lasting piping, valve lining, or O-ring seal for Acetic Acid (50%), the table below compares Buna-N against 8 other common industrial engineering materials:
| Wetted Material | Compatibility Rating | Service Recommendation | Material Temp Range |
|---|---|---|---|
| Polypropylene (PP Homopolymer & Copolymer) | A-Excellent | Safe for Continuous Industrial Service | 32°F to 180°F (0°C to 82°C) |
| 316 / 304 Austenitic Stainless Steel | B1-Good | Acceptable with Routine Inspection | -325°F to 800°F (-198°C to 426°C) |
| Viton® (FKM Fluoroelastomer) | C-Fair | Caution: Limited / Intermittent Service Only | -15°F to 400°F (-26°C to 204°C) |
| PTFE (Teflon® / Polytetrafluoroethylene) | A-Excellent | Safe for Continuous Industrial Service | -328°F to 500°F (-200°C to 260°C) |
| EPDM (Ethylene Propylene Diene Monomer) | A1-Excellent | Safe for Continuous Industrial Service | -60°F to 300°F (-51°C to 149°C) |
| PVC Type I (Unplasticized Polyvinyl Chloride / uPVC) | A1-Excellent | Safe for Continuous Industrial Service | 32°F to 140°F (0°C to 60°C) |
| PVDF (Kynar® / Polyvinylidene Fluoride) | A-Excellent | Safe for Continuous Industrial Service | -40°F to 280°F (-40°C to 138°C) |
| Buna-N (Nitrile / NBR Elastomer) (Current Page) | C-Fair | Caution: Limited / Intermittent Service Only | -40°F to 250°F (-40°C to 121°C) |
| HDPE (High-Density Polyethylene) | A-Excellent | Safe for Continuous Industrial Service | -60°F to 140°F (-51°C to 60°C) |
Frequently Asked Questions (FAQ)
Is Buna-N compatible with Acetic Acid (50%)?
Buna-N is rated C-Fair (Caution: Limited / Intermittent Service Only) with Acetic Acid (50%) (Formula: CH3COOH (50% aq.), CAS: 64-19-7). Triggers progressive mechanical degradation, plasticizer extraction, elastomeric swell, or localized corrosion over multi-day exposure. Do not specify for primary containment or pressurized lines. Select an A-rated alternative from the comparison matrix below.
What is the best alternative material for handling Acetic Acid (50%)?
If Buna-N does not meet your temperature or pressure requirements for Acetic Acid (50%), the highest-rated Grade A alternatives are Polypropylene, PTFE, EPDM, PVC. Always verify O-ring elastomers and metallic fasteners separately before full-scale deployment.
Technical Engineering FAQs: Acetic Acid (50%) vs Buna-N
Click any question below for chemical failure-mode specifics, thermal derating limits, and material selection rules: