Hydrochloric Acid 37% vs Polypropylene 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 Polypropylene exposed to Hydrochloric Acid 37% in Halogenated / Mineral Acid service.
Hydrochloric Acid 37% vs Polypropylene: C-Fair
Exposing Polypropylene to Hydrochloric Acid 37% (Formula: HCl (37% aq. Reagent Grade), CAS: 7647-01-0) 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: Viton, PTFE, PVC, PVDF.
Technical Specifications and Operating Parameters
| Chemical Medium | Hydrochloric Acid 37% |
|---|---|
| Chemical Formula | HCl (37% aq. Reagent Grade) |
| CAS Registry Number | 7647-01-0 |
| Chemical Functional Class | Halogenated / Mineral Acid |
| Wetted Material | Polypropylene |
| 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 | Viton, PTFE, PVC, PVDF |
| Backtest and Audit Verification | Verified against Cole-Parmer, ISM & Graco industrial chemical resistance charts. |
Hydrochloric Acid 37% Cross-Material Comparison Matrix (9 Materials)
Direct benchmark ratings across all 9 reference industrial materials for Hydrochloric Acid 37%:
| 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 | B-Good | Acceptable with Operating Controls | Ambient service (72°F / 22°C) preferred; monitor wear in continuous service | Report |
| HDPE | C1-Fair | Caution: Short-Term or Emergency Use Only | Short-term exposure only; avoid continuous pressurized service | Report |
| Polypropylene | C-Fair | Caution: Limited / Intermittent Service Only | Ambient intermittent contact only; do not pressurize | Report |
| PTFE | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | Report |
| PVC | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | 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 | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | Report |
Chemical and Material Interaction Analysis
Engineering Compatibility Verdict
Hydrochloric Acid 37% vs Polypropylene: C – Fair (Moderate Effect / Not Recommended for Continuous Duty)
Summary Verdict: Polypropylene (PP Homopolymer & Copolymer) is rated C-Fair (Caution: Limited / Intermittent Service Only) when exposed to Hydrochloric Acid 37% (Formula: HCl (37% aq. Reagent Grade), CAS: 7647-01-0). Do not specify for primary containment or pressurized lines. Select an A-rated alternative from the comparison matrix below.
Quick Engineering Specifications
| Chemical Media | Hydrochloric Acid 37% |
|---|---|
| Chemical Formula | HCl (37% aq. Reagent Grade) |
| CAS Registry Number | 7647-01-0 |
| Chemical Classification | Halogenated / Mineral Acid |
| Wetted Material | Polypropylene (PP Homopolymer & Copolymer) (Semi-Crystalline Polyolefin Thermoplastic) |
| 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: 32°F to 180°F (0°C to 82°C)) |
| Top Grade-A Alternatives | Viton, PTFE, PVC, PVDF |
| Data Verification Status | Verified against Cole-Parmer, ISM & Graco industrial chemical resistance charts. |
Chemical & Material Interaction Analysis
Hydrochloric Acid 37% is classified as a halogenated / mineral acid (aggressive halide ion attack, pitting risk in metals, and acid hydrolysis). Used in acid pickling, descaling, semiconductor etching, and industrial chemical processing. When selecting wetted components for Polypropylene, 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 (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 Hydrochloric Acid 37%
To help you select the longest-lasting piping, valve lining, or O-ring seal for Hydrochloric Acid 37%, 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) | C-Fair | Caution: Limited / Intermittent Service Only | 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) | A-Excellent | Safe for Continuous Industrial Service | -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) | B-Good | Acceptable with Operating Controls | -60°F to 300°F (-51°C to 149°C) |
| PVC Type I (Unplasticized Polyvinyl Chloride / uPVC) | A-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) | C-Fair | Caution: Limited / Intermittent Service Only | -40°F to 250°F (-40°C to 121°C) |
| HDPE (High-Density Polyethylene) | C1-Fair | Caution: Short-Term or Emergency Use Only | -60°F to 140°F (-51°C to 60°C) |
Frequently Asked Questions (FAQ)
Is Polypropylene compatible with Hydrochloric Acid 37%?
Polypropylene is rated C-Fair (Caution: Limited / Intermittent Service Only) with Hydrochloric Acid 37% (Formula: HCl (37% aq. Reagent Grade), CAS: 7647-01-0). 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 Hydrochloric Acid 37%?
If Polypropylene does not meet your temperature or pressure requirements for Hydrochloric Acid 37%, the highest-rated Grade A alternatives are Viton, PTFE, PVC, PVDF. Always verify O-ring elastomers and metallic fasteners separately before full-scale deployment.
Technical Engineering FAQs: Hydrochloric Acid 37% vs Polypropylene
Click any question below for chemical failure-mode specifics, thermal derating limits, and material selection rules: