Aqua Regia (80% HCl, 20% HNO3) vs Polypropylene Compatibility
Verified chemical resistance rating (Acceptable with Routine Inspection), thermal boundary limits (Up to 120°F (49°C) with minor absorption/corrosion allowance), and material specification guide for Polypropylene exposed to Aqua Regia (80% HCl, 20% HNO3) in Strong Oxidizing / Mineral Acid service.
Aqua Regia (80% HCl, 20% HNO3) vs Polypropylene: B1-Good
Exposing Polypropylene to Aqua Regia (80% HCl, 20% HNO3) (Formula: 3 HCl + HNO3, CAS: 8007-56-5) carries an official rating of B1-Good (Acceptable with Routine Inspection). Maximum recommended thermal operating limit: Up to 120°F (49°C) with minor absorption/corrosion allowance. 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 | Polypropylene |
| Official Resistance Rating | B1-Good (Grade B) |
| Engineering Service Verdict | Acceptable with Routine Inspection |
| Max Temp and Concentration Limit | Up to 120°F (49°C) with minor absorption/corrosion allowance |
| Best Grade A Alternatives | PTFE, PVDF |
| Backtest and Audit Verification | Verified against Cole-Parmer, ISM & Graco 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 Polypropylene: B1 – Good (Minor Effect up to 120°F / 49°C)
Summary Verdict: Polypropylene (PP Homopolymer & Copolymer) is rated B1-Good (Acceptable with Routine Inspection) when exposed to Aqua Regia (80% HCl, 20% HNO3) (Formula: 3 HCl + HNO3, CAS: 8007-56-5). Suitable for secondary transfer lines, static gaskets, and intermittent batch service. Avoid thin-walled high-stress dynamic seals without prior coupon testing.
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 | Polypropylene (PP Homopolymer & Copolymer) (Semi-Crystalline Polyolefin Thermoplastic) |
| Official Resistance Rating | B1 – Good (Minor Effect up to 120°F / 49°C) (Grade B) |
| Recommended Temperature Window | Up to 120°F (49°C) with minor absorption/corrosion allowance (Material limit: 32°F to 180°F (0°C to 82°C)) |
| Top Grade-A Alternatives | PTFE, PVDF |
| Data Verification Status | Verified against Cole-Parmer, ISM & Graco 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 Polypropylene, engineers must account for both concentration-dependent chemical attack and thermal stress:
- Reaction & Failure Mechanism: Causes slight surface absorption, minor weight gain (1%–5% swell in polymers), or a low corrosion rate (<2 to 20 mpy in metals) up to 120°F (49°C).
- Material Profile (Polypropylene): Broad resistance to aqueous acids, caustics, plating baths, and inorganic salt solutions without stress-corrosion cracking. However, susceptible to oxidative chain scission in strong oxidizing acids (fuming nitric/oleum) and rapid swelling/softening in chlorinated or aromatic hydrocarbons.
- Application Scope: Common wetted components include bulk chemical storage tanks, AODD pump manifolds, Schedule 80 piping, filter housings, and laboratory labware.
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 Polypropylene against 8 other common industrial engineering materials:
| Wetted Material | Compatibility Rating | Service Recommendation | Material Temp Range |
|---|---|---|---|
| Polypropylene (PP Homopolymer & Copolymer) (Current Page) | 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) | 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 Polypropylene compatible with Aqua Regia (80% HCl, 20% HNO3)?
Polypropylene is rated B1-Good (Acceptable with Routine Inspection) with Aqua Regia (80% HCl, 20% HNO3) (Formula: 3 HCl + HNO3, CAS: 8007-56-5). Causes slight surface absorption, minor weight gain (1%–5% swell in polymers), or a low corrosion rate (<2 to 20 mpy in metals) up to 120°F (49°C). Suitable for secondary transfer lines, static gaskets, and intermittent batch service. Avoid thin-walled high-stress dynamic seals without prior coupon testing.
What is the best alternative material for handling Aqua Regia (80% HCl, 20% HNO3)?
If Polypropylene 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 Polypropylene
Click any question below for chemical failure-mode specifics, thermal derating limits, and material selection rules: