Chemstar WATER’s CHEMSTAR 404VP Biodegradable Corrosion Inhibiting Powder
Corrosion Inhibiting Powder for Carbon Steel, Aluminum & Other Ferrous Metals (Patent Pending)
CHEMSTAR 404VP is a water-soluble Vapor Phase Corrosion Inhibitor (VPCI) powder engineered to provide wet or dry protection for ferrous metals and aluminum. Its innovative formula (Patent Pending) creates a protective vapor-phase barrier that safeguards even hard-to-reach internal surfaces. For applications requiring silica, CHEMSTAR 404VPS is also available.
Key Properties
CHEMSTAR 404VP
- Appearance: Off-white crystalline powder
- pH (1% aqueous): 6.0–7.0
- Solubility in Water: 15%
- Bulk Density: 38–39 lb/ft³ (0.61–0.63 kg/L)
CHEMSTAR 404VPS (with silica)
- Appearance: White to off-white powder
- pH (1% aqueous): 6.5–6.9
- Bulk Density: 37–38 lb/ft³ (0.59–0.61 kg/L)
Typical Applications
- Tubular structures, pipes, and vessels
- Voids, cavities, and tanks
- Internal surfaces of compressors, turbines, engines, boilers, heat exchangers
- Steam condensate lines, closed-loop heating and cooling systems
- Equipment during and after hydrostatic testing
- Parts, components, and assemblies during shipment or storage
- Additive in shot-blasting media or wet blasting solutions
- Treatment for standing water
Metals Protected
- Carbon steel
- Stainless steel
- Aluminum
- Other ferrous alloys
Advantages
- Vapor-phase inhibiting action – Forms a protective molecular layer on both visible and hidden surfaces, preventing corrosion in inaccessible or recessed areas.
- Self-replenishing – If disturbed by moisture or when an enclosure is opened, the protective layer reforms via continuous vapor redeposition.
- Non-disruptive – Typically requires no removal before normal processing; if removal is necessary, a simple water rinse or air blow-off will suffice.
- Low impact on alkalinity – Does not raise pH significantly in systems where pH balance is critical.
- Cost-effective coverage – Delivers comprehensive protection for large or complex systems at an economical dosage.
Features
- Cefas-Accepted Offshore Chemical – Registered under OCNS number 25717 for use up to 5,000 ppm.
- Three-phase protection (liquid, vapor, and interface) – Protects metal surfaces below and above the waterline.
- Monomolecular layer – Forms a thin, robust film that shields metal surfaces for up to 24 months.
- No nitrites, phosphates, or heavy metals – Minimizes environmental and handling risks.
Application Methods
Dry Powder Application: Dust, fog, or sprinkle CHEMSTAR 404VP/404VPS directly into enclosed spaces (e.g., piping, tanks, vessels). Large-scale fogging can be performed using a low-pressure air hose and sandblasting cup.
Aqueous Application: Dissolve CHEMSTAR 404VP in water and apply via spray, flush, or immersion. After application, seal or close off the cavity or void to maintain an optimal protective environment.
Dosage
- Dry Application: Under typical conditions, use 0.3–0.5 oz (8.5–14 g) per 1 ft³ (28 L) of enclosed space, equivalent to 300–500 g/m³. Increase dosage for harsher environments.
- Aqueous Application: Consult your Chemstar WATER representative for specific recommendations based on your operating conditions, water chemistry, and project requirements.
Removal
- Easy Removal (Dry Form): Simply blow out the powder using a low-pressure air gun or rinse with water.
- Minimal Residue (Aqueous Form): Often, no removal is needed after aqueous application. If necessary, a quick water rinse will remove any residual inhibitor.
Packaging & Storage
Available in 5 lb (2.3 kg), 50 lb (23 kg), or 100 lb (45 kg) moisture-barrier bags, packed in fiber-lined drums. Also offered in convenient EcoPouch® formats. Store in a sealed container in a dry warehouse, away from direct sunlight. Recommended storage temperatures should not exceed 150°F (65°C). Under optimal conditions, shelf life is up to 24 months.
Environmental & Toxicological Testing
- Biodegradable – Demonstrates 100% biodegradability in marine environments (OECD 306, BOD 28 Marine test).
- Low Toxicity – Oral LD50 of 5,000 mg/kg in rats.
- No Bioaccumulation – No significant potential for bioaccumulation (OECD Guideline 117).
All testing performed according to Oslo-Paris Commission protocols by Nortech A.S. (Norway).
Experience the Next Generation of Corrosion Control
CHEMSTAR 404VP and 404VPS represent a leap forward in corrosion protection, offering reliable, long-term shielding for ferrous metals and aluminum—without the downsides of traditional inhibitors. Whether you need preservation during shipping, protection after hydrostatic testing, or storage peace of mind, our biodegradable, vapor-phase inhibitors deliver comprehensive coverage that is easy to apply and maintain.
For more information on CHEMSTAR 404VP or other innovative water treatment and corrosion protection solutions, please contact Chemstar WATER today.
