C&W CW4097 / CW4096 Corrosion Test Grade Sodium Chloride for Salt Spray and CCT Chambers
| Brand | C&W |
|---|---|
| Origin | Netherlands |
| Product Type | ASTM B117- and ISO 9227–Compliant Sodium Chloride |
| Purity | ≥99.9% NaCl (min) |
| Contaminants | Cu < 0.1 ppm, F⁻ < 0.5 ppm, I⁻ < 0.05 ppm, Br⁻ < 0.2 ppm, anti-caking agents: none |
| Particle Size | Coarse, free-flowing granules (d₅₀ ≈ 250–400 µm) |
| Packaging | 25 kg drum (CW4097) or 4 × 5 kg handled buckets (CW4096) |
| Certifications | Independent CoA per batch, accredited lab analysis per NEN-EN-ISO/IEC 17025 |
Overview
C&W Corrosion Test Grade Sodium Chloride is a rigorously engineered consumable specifically formulated for standardized salt spray (fog) testing and cyclic corrosion testing (CCT) in environmental test chambers. Unlike generic laboratory-grade or food-grade sodium chloride, this material adheres strictly to the chemical purity, particle morphology, and contaminant control requirements defined in ASTM B117, ISO 9227, and JIS Z 2371. Its core function is to generate a reproducible, non-precipitating, and electrochemically stable saline aerosol—critical for achieving high inter-laboratory correlation and regulatory compliance in corrosion performance evaluation of metallic substrates, coatings, and surface treatments.
Key Features
- ASTM B117 & ISO 9227 Compliance Verified: Each production batch undergoes full elemental analysis by an ISO/IEC 17025-accredited Dutch laboratory, with certified reports documenting trace metal impurities (Cu, Fe, Ni), halides (F⁻, Cl⁻, Br⁻, I⁻), sulfate, calcium, magnesium, and absence of anti-caking agents.
- Controlled Granulometry: Engineered coarse granules (d₅₀ ≈ 300 µm) eliminate airborne dust during handling while ensuring rapid, complete dissolution without residue—reducing maintenance frequency and minimizing nozzle clogging in chamber atomizers.
- No Anti-Caking Additives: Avoids organic or silicate-based flow agents that decompose under elevated temperature/humidity, potentially depositing conductive residues on test specimens or chamber internals—thereby compromising test validity and accelerating chamber corrosion.
- Optimized Solubility & Stability: High-purity NaCl (>99.9% assay) ensures consistent conductivity (≈4.5–5.2 mS/cm at 5 wt% solution, 35 °C), critical for maintaining prescribed fog density and pH stability (6.5–7.2) throughout extended test cycles.
- Traceability & Documentation: Full Certificate of Analysis (CoA) includes lot number, manufacturing date, expiry (36 months from production when stored sealed at <60% RH), and analytical methodology references (ICP-MS, IC, gravimetry).
Sample Compatibility & Compliance
This sodium chloride is validated for use across all major salt spray and CCT chamber platforms—including C&W’s own series, Q-Lab Q-FOG®, Atlas CI series, and BINDER KMF units—without modification to standard operating procedures. It supports testing of ferrous and non-ferrous metals (e.g., carbon steel, galvanized steel, aluminum alloys, stainless steels), organic coatings (epoxy, polyurethane), conversion coatings (chromate, phosphate), and automotive OEM specifications (e.g., GMW 14872, Ford CETP, VW PV1210). The low halide impurity profile ensures compatibility with stringent aerospace (SAE AMS 2700) and medical device (ISO 10993-15) corrosion screening protocols where chloride-induced pitting or crevice corrosion must be isolated from extraneous ion effects.
Software & Data Management
While C&W Corrosion Test Salt is a consumable—not a hardware or software product—it integrates seamlessly into GLP/GMP-compliant quality management systems. Batch-specific CoAs are digitally archived and retrievable via unique lot codes, enabling full audit trail linkage to chamber log files, test reports (per ASTM E29, ISO/IEC 17025), and electronic records in LIMS or ELN environments. No proprietary software is required; documentation meets FDA 21 CFR Part 11 requirements for electronic signatures and record retention when paired with validated document management workflows.
Applications
- Neutral Salt Spray (NSS) testing per ASTM B117 and ISO 9227
- Acetic Acid Salt Spray (AASS) and Copper-Accelerated Acetic Acid Salt Spray (CASS) per ASTM G85 Annex A1/A2
- Cyclic Corrosion Testing (CCT) including Prohesion™, GMW 14872, and VDA 621-415
- Qualification of corrosion inhibitors, passivation layers, and sacrificial anodes
- Accelerated aging validation for marine, automotive, and infrastructure components
FAQ
Is this salt suitable for use in non-C&W brand chambers?
Yes. Its formulation and purity meet universal ASTM/ISO requirements and has been verified across multiple third-party chamber platforms.
Why is the absence of anti-caking agents critical?
Anti-caking agents (e.g., sodium ferrocyanide, silicon dioxide) can volatilize or hydrolyze under chamber conditions, forming insulating or catalytic deposits that distort corrosion morphology and invalidate comparative test data.
How should the salt be stored to maintain integrity?
Store unopened containers in a dry, temperature-stable environment (<25 °C, <60% RH); once opened, reseal tightly and use within 6 months to prevent moisture uptake and clumping.
What does “coarse granule” mean for test repeatability?
Consistent particle size distribution minimizes variation in dissolution kinetics and aerosol generation efficiency—key factors influencing fog uniformity, deposition rate, and test-to-test reproducibility.
Can I use this salt for pH-adjusted tests like CASS?
Yes. Its ultra-low copper and halide content prevents unintended acceleration or inhibition of copper-mediated corrosion mechanisms, allowing precise control of acetic acid and CuCl₂ additions per ASTM G85 Annex A2.
