Aqua Regia (80% HCl, 20% HNO3) vs PVC Compatibility
Verified chemical resistance rating (Acceptable with Operating Controls), thermal boundary limits (Ambient service (72°F / 22°C) preferred; monitor wear in continuous service), and material specification guide for PVC exposed to Aqua Regia (80% HCl, 20% HNO3) in Strong Oxidizing / Mineral Acid service.
Aqua Regia (80% HCl, 20% HNO3) vs PVC: B-Good
Exposing PVC to Aqua Regia (80% HCl, 20% HNO3) (Formula: 3 HCl + HNO3, CAS: 8007-56-5) carries an official rating of B-Good (Acceptable with Operating Controls). Maximum recommended thermal operating limit: Ambient service (72°F / 22°C) preferred; monitor wear in continuous service. Best Grade A alternative materials for continuous or high-temperature service: PTFE, PVDF.
Technical Specifications and Operating Parameters
| Chemical Medium | Aqua Regia (80% HCl, 20% HNO3) |
|---|---|
| Chemical Formula | 3 HCl + HNO3 |
| CAS Registry Number | 8007-56-5 |
| Chemical Functional Class | Strong Oxidizing / Mineral Acid |
| Wetted Material | PVC |
| Official Resistance Rating | B-Good (Grade B) |
| Engineering Service Verdict | Acceptable with Operating Controls |
| Max Temp and Concentration Limit | Ambient service (72°F / 22°C) preferred; monitor wear in continuous service |
| Best Grade A Alternatives | PTFE, PVDF |
| Backtest and Audit Verification | Verified against Cole-Parmer, ISM, Graco & CP Lab Safety industrial chemical resistance charts. |
Aqua Regia (80% HCl, 20% HNO3) Cross-Material Comparison Matrix (9 Materials)
Direct benchmark ratings across all 9 reference industrial materials for Aqua Regia (80% HCl, 20% HNO3):
| Material Name | Compatibility Rating | Service Verdict | Temperature Limit | Datasheet |
|---|---|---|---|---|
| Buna-N | D-Severe Effect | Incompatible — Immediate Failure Risk | Not recommended at any temperature or concentration | Report |
| EPDM | D-Severe Effect | Incompatible — Immediate Failure Risk | Not recommended at any temperature or concentration | Report |
| HDPE | B-Good | Acceptable with Operating Controls | Ambient service (72°F / 22°C) preferred; monitor wear in continuous service | Report |
| Polypropylene | B1-Good | Acceptable with Routine Inspection | Up to 120°F (49°C) with minor absorption/corrosion allowance | Report |
| PTFE | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | Report |
| PVC | B-Good | Acceptable with Operating Controls | Ambient service (72°F / 22°C) preferred; monitor wear in continuous service | Report |
| PVDF | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | Report |
| Stainless Steel | D-Severe Effect | Incompatible — Immediate Failure Risk | Not recommended at any temperature or concentration | Report |
| Viton | B-Good | Acceptable with Operating Controls | Ambient service (72°F / 22°C) preferred; monitor wear in continuous service | Report |
| Buna-N | D-Severe Effect | Incompatible — Immediate Failure Risk | Not recommended at any temperature or concentration | Report |
| EPDM | D-Severe Effect | Incompatible — Immediate Failure Risk | Not recommended at any temperature or concentration | Report |
| HDPE | B-Good | Acceptable with Operating Controls | Ambient service (72°F / 22°C) preferred; monitor wear in continuous service | Report |
| Polypropylene | B1-Good | Acceptable with Routine Inspection | Up to 120°F (49°C) with minor absorption/corrosion allowance | Report |
| PTFE | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | Report |
| PVC | B-Good | Acceptable with Operating Controls | Ambient service (72°F / 22°C) preferred; monitor wear in continuous service | Report |
| PVDF | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | Report |
| Stainless Steel | D-Severe Effect | Incompatible — Immediate Failure Risk | Not recommended at any temperature or concentration | Report |
| Viton | B-Good | Acceptable with Operating Controls | Ambient service (72°F / 22°C) preferred; monitor wear in continuous service | Report |
Chemical and Material Interaction Analysis
Engineering Compatibility Verdict
Aqua Regia (80% HCl, 20% HNO3) vs PVC: B – Good (Minor Effect / Conditional)
Summary Verdict: PVC Type I (Unplasticized Polyvinyl Chloride / uPVC) is rated B-Good (Acceptable with Operating Controls) when exposed to Aqua Regia (80% HCl, 20% HNO3) (Formula: 3 HCl + HNO3, CAS: 8007-56-5). Acceptable for low-pressure piping, static seals, and scheduled-maintenance components. Implement periodic visual and dimensional inspection.
Quick Engineering Specifications
| Chemical Media | Aqua Regia (80% HCl, 20% HNO3) |
|---|---|
| Chemical Formula | 3 HCl + HNO3 |
| CAS Registry Number | 8007-56-5 |
| Chemical Classification | Strong Oxidizing / Mineral Acid |
| Wetted Material | PVC Type I (Unplasticized Polyvinyl Chloride / uPVC) (Amorphous Rigid Halopolymer Thermoplastic) |
| Official Resistance Rating | B – Good (Minor Effect / Conditional) (Grade B) |
| Recommended Temperature Window | Ambient service (72°F / 22°C) preferred; monitor wear in continuous service (Material limit: 32°F to 140°F (0°C to 60°C)) |
| Top Grade-A Alternatives | PTFE, PVDF |
| Data Verification Status | Verified against Cole-Parmer, ISM, Graco & CP Lab Safety industrial chemical resistance charts. |
Chemical & Material Interaction Analysis
Aqua Regia (80% HCl, 20% HNO3) is classified as a strong oxidizing / mineral acid (corrosive proton attack combined with strong oxidative potential). Used in chemical synthesis, metal pickling, pH neutralization, and industrial etching. When selecting wetted components for PVC, engineers must account for both concentration-dependent chemical attack and thermal stress:
- Reaction & Failure Mechanism: Exhibits minor chemical interaction—such as slight discoloration, mild dimensional swell, or slow uniform surface etching—that does not immediately compromise structural integrity.
- Material Profile (PVC): Cost-effective, rigid corrosion resistance against mineral acids, alkalis, sodium hypochlorite bleach, and inorganic salt brines at ambient temperatures. However, low upper temperature limit (140°F/60°C) and immediate solvation/softening upon contact with ketones, esters, ethers, aromatic hydrocarbons, and chlorinated solvents.
- Application Scope: Common wetted components include Schedule 40/80 chemical feed piping, water/wastewater treatment headers, acid scrubbers, and ball/diaphragm valves.
Cross-Material Compatibility Comparison for Aqua Regia (80% HCl, 20% HNO3)
To help you select the longest-lasting piping, valve lining, or O-ring seal for Aqua Regia (80% HCl, 20% HNO3), the table below compares PVC against 8 other common industrial engineering materials:
| Wetted Material | Compatibility Rating | Service Recommendation | Material Temp Range |
|---|---|---|---|
| Polypropylene (PP Homopolymer & Copolymer) | B1-Good | Acceptable with Routine Inspection | 32°F to 180°F (0°C to 82°C) |
| 316 / 304 Austenitic Stainless Steel | D-Severe Effect | Incompatible — Immediate Failure Risk | -325°F to 800°F (-198°C to 426°C) |
| Viton® (FKM Fluoroelastomer) | B-Good | Acceptable with Operating Controls | -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) | D-Severe Effect | Incompatible — Immediate Failure Risk | -60°F to 300°F (-51°C to 149°C) |
| PVC Type I (Unplasticized Polyvinyl Chloride / uPVC) (Current Page) | B-Good | Acceptable with Operating Controls | 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) | D-Severe Effect | Incompatible — Immediate Failure Risk | -40°F to 250°F (-40°C to 121°C) |
| HDPE (High-Density Polyethylene) | B-Good | Acceptable with Operating Controls | -60°F to 140°F (-51°C to 60°C) |
Frequently Asked Questions (FAQ)
Is PVC compatible with Aqua Regia (80% HCl, 20% HNO3)?
PVC is rated B-Good (Acceptable with Operating Controls) with Aqua Regia (80% HCl, 20% HNO3) (Formula: 3 HCl + HNO3, CAS: 8007-56-5). Exhibits minor chemical interaction—such as slight discoloration, mild dimensional swell, or slow uniform surface etching—that does not immediately compromise structural integrity. Acceptable for low-pressure piping, static seals, and scheduled-maintenance components. Implement periodic visual and dimensional inspection.
What is the best alternative material for handling Aqua Regia (80% HCl, 20% HNO3)?
If PVC does not meet your temperature or pressure requirements for Aqua Regia (80% HCl, 20% HNO3), the highest-rated Grade A alternatives are PTFE, PVDF. Always verify O-ring elastomers and metallic fasteners separately before full-scale deployment.
Technical Engineering FAQs: Aqua Regia (80% HCl, 20% HNO3) vs PVC
Click any question below for chemical failure-mode specifics, thermal derating limits, and material selection rules: