Sodium Sulfide vs Viton Compatibility
Verified chemical resistance rating (Safe for Continuous Ambient Service), thermal boundary limits (Verified up to 72°F (22°C); conduct thermal de-rating above 100°F (38°C)), and material specification guide for Viton exposed to Sodium Sulfide in Inorganic Salt / Brine / Ionic Solution service.
Sodium Sulfide vs Viton: A2-Excellent
Exposing Viton to Sodium Sulfide (Formula: Na2S, CAS: 1313-82-2) carries an official rating of A2-Excellent (Safe for Continuous Ambient Service). Maximum recommended thermal operating limit: Verified up to 72°F (22°C); conduct thermal de-rating above 100°F (38°C). Best Grade A alternative materials for continuous or high-temperature service: Polypropylene, PTFE, PVDF, HDPE.
Technical Specifications and Operating Parameters
| Chemical Medium | Sodium Sulfide |
|---|---|
| Chemical Formula | Na2S |
| CAS Registry Number | 1313-82-2 |
| Chemical Functional Class | Inorganic Salt / Brine / Ionic Solution |
| Wetted Material | Viton |
| Official Resistance Rating | A2-Excellent (Grade A) |
| Engineering Service Verdict | Safe for Continuous Ambient Service |
| Max Temp and Concentration Limit | Verified up to 72°F (22°C); conduct thermal de-rating above 100°F (38°C) |
| Best Grade A Alternatives | Polypropylene, PTFE, PVDF, HDPE |
| Backtest and Audit Verification | Verified against Cole-Parmer, ISM & Graco industrial chemical resistance charts. |
Sodium Sulfide Cross-Material Comparison Matrix (9 Materials)
Direct benchmark ratings across all 9 reference industrial materials for Sodium Sulfide:
| Material Name | Compatibility Rating | Service Verdict | Temperature Limit | Datasheet |
|---|---|---|---|---|
| Buna-N | B-Good | Acceptable with Operating Controls | Ambient service (72°F / 22°C) preferred; monitor wear in continuous service | Report |
| EPDM | B-Good | Acceptable with Operating Controls | Ambient service (72°F / 22°C) preferred; monitor wear in continuous 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 | 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 | B-Good | Acceptable with Operating Controls | Ambient service (72°F / 22°C) preferred; monitor wear in continuous service | Report |
| Viton | A2-Excellent | Safe for Continuous Ambient Service | Verified up to 72°F (22°C); conduct thermal de-rating above 100°F (38°C) | Report |
Chemical and Material Interaction Analysis
Engineering Compatibility Verdict
Sodium Sulfide vs Viton: A2 – Excellent (No Effect up to 72°F / 22°C)
Summary Verdict: Viton® (FKM Fluoroelastomer) is rated A2-Excellent (Safe for Continuous Ambient Service) when exposed to Sodium Sulfide (Formula: Na2S, CAS: 1313-82-2). Recommended for ambient storage tanks, transfer lines, and seals. If process temperatures exceed 100°F (38°C), verify pressure de-rating factors.
Quick Engineering Specifications
| Chemical Media | Sodium Sulfide |
|---|---|
| Chemical Formula | Na2S |
| CAS Registry Number | 1313-82-2 |
| Chemical Classification | Inorganic Salt / Brine / Ionic Solution |
| Wetted Material | Viton® (FKM Fluoroelastomer) (High-Performance Fluorinated Elastomer) |
| Official Resistance Rating | A2 – Excellent (No Effect up to 72°F / 22°C) (Grade A) |
| Recommended Temperature Window | Verified up to 72°F (22°C); conduct thermal de-rating above 100°F (38°C) (Material limit: -15°F to 400°F (-26°C to 204°C)) |
| Top Grade-A Alternatives | Polypropylene, PTFE, PVDF, HDPE |
| Data Verification Status | Verified against Cole-Parmer, ISM & Graco industrial chemical resistance charts. |
Chemical & Material Interaction Analysis
Sodium Sulfide 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 Viton, engineers must account for both concentration-dependent chemical attack and thermal stress:
- Reaction & Failure Mechanism: Exhibits no chemical degradation or structural loss at ambient room temperatures (72°F / 22°C), though elevated temperatures may accelerate minor permeation.
- Material Profile (Viton): Exceptional resistance to aliphatic and aromatic hydrocarbons, petroleum oils, concentrated mineral acids, and halogenated solvents at elevated temperatures. However, severely attacked by polar oxygenated solvents (acetone, MEK, ethyl acetate, THF), anhydrous ammonia, primary amines, and hot concentrated caustic soda via dehydrofluorination.
- Application Scope: Common wetted components include O-ring static/dynamic seals, pump diaphragms, valve seats, flange gaskets, and chemical transfer hose liners.
Cross-Material Compatibility Comparison for Sodium Sulfide
To help you select the longest-lasting piping, valve lining, or O-ring seal for Sodium Sulfide, the table below compares Viton 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 | B-Good | Acceptable with Operating Controls | -325°F to 800°F (-198°C to 426°C) |
| Viton® (FKM Fluoroelastomer) (Current Page) | A2-Excellent | Safe for Continuous Ambient 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) | 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) | B-Good | Acceptable with Operating Controls | -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 Viton compatible with Sodium Sulfide?
Viton is rated A2-Excellent (Safe for Continuous Ambient Service) with Sodium Sulfide (Formula: Na2S, CAS: 1313-82-2). Exhibits no chemical degradation or structural loss at ambient room temperatures (72°F / 22°C), though elevated temperatures may accelerate minor permeation. Recommended for ambient storage tanks, transfer lines, and seals. If process temperatures exceed 100°F (38°C), verify pressure de-rating factors.
What is the best alternative material for handling Sodium Sulfide?
If Viton does not meet your temperature or pressure requirements for Sodium Sulfide, the highest-rated Grade A alternatives are Polypropylene, PTFE, PVDF, HDPE. Always verify O-ring elastomers and metallic fasteners separately before full-scale deployment.
Technical Engineering FAQs: Sodium Sulfide vs Viton
Click any question below for chemical failure-mode specifics, thermal derating limits, and material selection rules: