Product Overview
This acid-washed high-iodine coconut shell carbon (PSD-A1 S) is built for water systems that refuse the usual compromise between adsorption capacity and chemical purity. Iodine adsorption exceeds 1100 mg/g, BET surface area tops 1,000 m²/g, and ash content is held below 3%—a combination that standard acid-washed grades rarely deliver.
A rigorous acid-wash step neutralizes surface alkalinity to pH 5–8, preventing the pH drift that destabilizes closed-loop systems and the alkaline spikes that spoil first-flush taste in residential filters. We carbonize, activate, and acid-wash every batch in-house, and each lot ships against certified limits for iodine, ash, moisture, and pH.
Key Advantages
- Maximum Capacity + Maximum Purity: The only grade in the PSD-A series combining >1100 mg/g iodine with <3% ash and pH-neutral chemistry—no trade-off between capacity and purity.
- POU-Optimized Chemistry: Neutral effluent from the first liter, with no alkaline spike during initial flush—better taste and no stress on residential plumbing.
- Electronics-Grade Compatibility: Acid washing strips the leachable ions that cause conductivity spikes in semiconductor UPW and plating loops, protecting yield-sensitive processes.
- Traceable In-House Production: From selected coconut shell feedstock through activation and acid washing, every batch ships with a certificate of analysis covering iodine, ash, moisture, and pH.
Key Application Areas
- Point-of-Use (POU) Drinking Water Filters — High-capacity chlorine and organic removal in undersink and countertop units, with neutral-pH effluent for consumer safety and taste.
- Semiconductor Ultra-Pure Water — Polishes UPW for wafer cleaning and wet processing, where trace metals and pH excursions are strictly controlled to prevent yield loss.
- Electroplating & Surface Finishing — Circulates in plating bath loops to adsorb organic brightener breakdown products without shifting bath pH or introducing metallic contaminants.
- Food & Beverage Ingredient Water — The highest purity tier for premium bottled water, craft brewing, and ingredient preparation where acid-washed purity meets direct-contact standards.
Specifications
| Technical Specifications | PSD-A1 S | Unit |
|---|---|---|
| Iodine Adsorption Value | >1100 | mg/g |
| Moisture Content | <10 | % -wt |
| Ash Content | <3 | % -wt |
| Bulk Density | 430~530 | kg/m³ |
| pH | 5-8 | - |
| Crush Strength | >95 | % |
| Specific Surface Area | >1000 | m²/g |
| Particle Size >12 Mesh (1.70 mm) | <10 | % -wt |
| Particle Size <40 Mesh (0.43 mm) | <5 | % -wt |
Available particle size
- 8×20 Mesh ( 0.85 ~ 2.36 mm)
- 8×30 Mesh ( 0.6 ~ 2.36 mm)
- 12×30 Mesh ( 0.6 ~ 1.7 mm)
- 20×40 Mesh ( 0.43 ~ 0.85 mm)
- 30×60 Mesh ( 0.25 ~ 0.6 mm)
- 80 ~ 200 Mesh ( 0.075 ~ 0.18 mm)
- Other customized particle sizes
Packaging
- 25 kg/package
- 500 kg/package
High Capacity and pH Stability—Without the Trade-Off
Sensitive water treatment usually forces a choice. High-capacity carbons reach >1100 mg/g iodine but carry alkaline ash that disrupts pH-sensitive processes. Acid-washed carbons reach pH neutrality but lose capacity during washing. This grade (PSD-A1 S) resolves it: extended activation builds the micropore volume first, then acid washing removes soluble minerals without collapsing the pore structure.
The result shows up differently in each application. In semiconductor wet processing, it prevents the conductivity spikes and trace-metal introduction that erode wafer yield. In POU drinking water filters, the neutral pH eliminates first-flush alkaline spikes and improves taste. In electroplating baths, ultra-low leachables keep bath chemistry stable while organic brightener breakdown products are removed.
Choosing the Right Grade: Capacity, Purity, or Both
For standard POU and sensitive process water, our pH-neutral grade (PSD-A0 S) delivers excellent performance; but under high organic loading or extended service intervals, the extra 10–15% capacity margin of this acid-washed grade (PSD-A1 S) can be the difference between scheduled maintenance and unplanned breakthrough. Where pH control is not critical, the standard enhanced grade (PSD-A1) offers the same capacity without the acid-washed purity that electroplating, semiconductor rinse, and premium POU systems demand.
Selection is straightforward. Choose the pH-neutral PSD-A0 S where 1,000 mg/g iodine is enough. Choose standard PSD-A1 for high-duty water where pH is not critical. Choose PSD-A1 S when the specification calls for both >1100 mg/g iodine and pH 5–8—semiconductor UPW, electroplating circulation, or premium residential filtration.
Customization & Supply
Standard sizes from 8×20 to 80×200 mesh ship from stock, and custom cuts are available on request. Packaging options include 25 kg bags and 500 kg bulk bags. Samples and batch certificates of analysis are available before order confirmation, and we support OEM filter programs with documented, batch-to-batch consistency.