Polyaluminum Chloride (PAC) vs Stainless Steel Compatibility
Verified chemical resistance rating (Incompatible — Immediate Failure Risk), thermal boundary limits (Not recommended at any temperature or concentration), and material specification guide for Stainless Steel exposed to Polyaluminum Chloride (PAC) in Inorganic Salt / Brine / Ionic Solution service.
Polyaluminum Chloride (PAC) vs Stainless Steel: D-Severe Effect
Exposing Stainless Steel to Polyaluminum Chloride (PAC) (Formula: Aln(OH)mCl3n-m, CAS: 1327-41-9) carries an official rating of D-Severe Effect (Incompatible — Immediate Failure Risk). Maximum recommended thermal operating limit: Not recommended at any temperature or concentration. Best Grade A alternative materials for continuous or high-temperature service: Polypropylene, Viton, PTFE, EPDM.
Technical Specifications and Operating Parameters
| Chemical Medium | Polyaluminum Chloride (PAC) |
|---|---|
| Chemical Formula | Aln(OH)mCl3n-m |
| CAS Registry Number | 1327-41-9 |
| Chemical Functional Class | Inorganic Salt / Brine / Ionic Solution |
| Wetted Material | Stainless Steel |
| Official Resistance Rating | D-Severe Effect (Grade D) |
| Engineering Service Verdict | Incompatible — Immediate Failure Risk |
| Max Temp and Concentration Limit | Not recommended at any temperature or concentration |
| Best Grade A Alternatives | Polypropylene, Viton, PTFE, EPDM |
| Backtest and Audit Verification | Verified against Cole-Parmer, ISM, Graco & CP Lab Safety industrial chemical resistance charts. |
Polyaluminum Chloride (PAC) Cross-Material Comparison Matrix (9 Materials)
Direct benchmark ratings across all 9 reference industrial materials for Polyaluminum Chloride (PAC):
| Material Name | Compatibility Rating | Service Verdict | Temperature Limit | Datasheet |
|---|---|---|---|---|
| Buna-N | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | Report |
| EPDM | A-Excellent | Safe for Continuous Industrial Service | Ambient to elevated operating temperatures within standard material limits | 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 | 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
Polyaluminum Chloride (PAC) vs Stainless Steel: D – Severe Effect (Do Not Use)
Summary Verdict: 316 / 304 Austenitic Stainless Steel is rated D-Severe Effect (Incompatible — Immediate Failure Risk) when exposed to Polyaluminum Chloride (PAC) (Formula: Aln(OH)mCl3n-m, CAS: 1327-41-9). PROHIBITED for wetted service. Immediately substitute with an A-rated material shown in the cross-material comparison table below.
Quick Engineering Specifications
| Chemical Media | Polyaluminum Chloride (PAC) |
|---|---|
| Chemical Formula | Aln(OH)mCl3n-m |
| CAS Registry Number | 1327-41-9 |
| Chemical Classification | Inorganic Salt / Brine / Ionic Solution |
| Wetted Material | 316 / 304 Austenitic Stainless Steel (Passivated Chromium-Nickel-Molybdenum Alloy) |
| Official Resistance Rating | D – Severe Effect (Do Not Use) (Grade D) |
| Recommended Temperature Window | Not recommended at any temperature or concentration (Material limit: -325°F to 800°F (-198°C to 426°C)) |
| Top Grade-A Alternatives | Polypropylene, Viton, PTFE, EPDM |
| Data Verification Status | Verified against Cole-Parmer, ISM, Graco & CP Lab Safety industrial chemical resistance charts. |
Chemical & Material Interaction Analysis
Polyaluminum Chloride (PAC) is classified as an inorganic salt / brine / ionic solution (electrolytic corrosion risk in metals, especially chlorides/halides, while thermoplastics remain largely inert). Used in water treatment, chemical dosing, brine handling, and industrial process streams. When selecting wetted components for Stainless Steel, engineers must account for both concentration-dependent chemical attack and thermal stress:
- Reaction & Failure Mechanism: Causes rapid, catastrophic material failure—including severe dissolution, stress cracking, extreme volumetric blowout (>25% swell), or rapid pitting corrosion (>50 mpy).
- Material Profile (Stainless Steel): Superior mechanical strength, high-temperature tolerance, and complete immunity to organic solvent swelling in ketones, esters, aromatics, and fuels. However, vulnerable to catastrophic localized pitting, crevice corrosion, and chloride stress-corrosion cracking (SCC) in halide acids (HCl, HBr), ferric/cupric chlorides, and sodium hypochlorite bleach.
- Application Scope: Common wetted components include high-pressure process piping, sanitary food/pharma vessels, centrifugal pump casings, heat exchangers, and valve bodies.
Cross-Material Compatibility Comparison for Polyaluminum Chloride (PAC)
To help you select the longest-lasting piping, valve lining, or O-ring seal for Polyaluminum Chloride (PAC), the table below compares Stainless Steel 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 (Current Page) | 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) | A-Excellent | Safe for Continuous Industrial Service | -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) | A-Excellent | Safe for Continuous Industrial Service | -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 Stainless Steel compatible with Polyaluminum Chloride (PAC)?
Stainless Steel is rated D-Severe Effect (Incompatible — Immediate Failure Risk) with Polyaluminum Chloride (PAC) (Formula: Aln(OH)mCl3n-m, CAS: 1327-41-9). Causes rapid, catastrophic material failure—including severe dissolution, stress cracking, extreme volumetric blowout (>25% swell), or rapid pitting corrosion (>50 mpy). PROHIBITED for wetted service. Immediately substitute with an A-rated material shown in the cross-material comparison table below.
What is the best alternative material for handling Polyaluminum Chloride (PAC)?
If Stainless Steel does not meet your temperature or pressure requirements for Polyaluminum Chloride (PAC), the highest-rated Grade A alternatives are Polypropylene, Viton, PTFE, EPDM. Always verify O-ring elastomers and metallic fasteners separately before full-scale deployment.
Technical Engineering FAQs: Polyaluminum Chloride (PAC) vs Stainless Steel
Click any question below for chemical failure-mode specifics, thermal derating limits, and material selection rules: