High Purity Coconut Shell Carbon for Electronics

In microelectronics manufacturing, water quality directly determines chip yield rates. While standard activated carbon can effectively remove residual chlorine, it often carries the inherent risks of high ash content and the leaching of metal ions—factors that can be catastrophic to sensitive RO membranes and photolithography processes. Our High Purity Coconut Shell Carbon for Electronics is not merely a "filtration material," but rather a "precision guardian" within semiconductor ultra-pure water systems.

Product Features

1. Extremely Low Impurity Leaching
Unlike coal-based carbons, coconut shell raw materials naturally possess a very low ash content. Through our specialized acid-washing purification process, we keep the ash content below 0.5%, effectively preventing the deposition of metal ions—such as calcium, magnesium, and iron—during subsequent processing stages.

2. Targeted Microporous Adsorption
Utilizing a dual physical-chemical activation process, we engineer a pore structure dominated by micropores (<2 nm). This structure is specifically designed to "hunt down" organic contaminants with molecular weights between 500 and 1000 Daltons (e.g., benzene derivatives and halogenated hydrocarbons)—the primary culprits behind elevated TOC levels.

3. Exceptional Physical Strength
In high-pressure reverse osmosis systems, carbon granules must withstand the immense impact of high-velocity water flow. Our High Purity Coconut Shell Carbon for Electronics boasts a physical strength rating of ≥97%; it resists pulverization and prevents pipeline clogging even during prolonged use, thereby significantly reducing replacement frequency and maintenance costs.

Core Advantages

1. Raw Material Selection: Premium Aged Coconut Shells from Southeast Asia—Purity Controlled at the Source
We meticulously select aged coconut shells (from trees over 10 years old) sourced from Malaysia and Indonesia. These materials undergo rigorous manual inspection to remove any insect-damaged or moldy shells, ensuring that the raw material meets strict specifications: density ≥ 0.6 g/cm³, moisture content ≤ 12%, and initial ash content ≤ 2%. This rigorous selection process lays a solid foundation for subsequent high-purity processing. Furthermore, every batch of raw material undergoes XRF analysis to rule out the risk of excessive heavy metal levels, thereby guaranteeing safety for electronics-grade applications.

2. Seven-Stage Purification: Patented Process for Ultra-Pure Quality
We employ an innovative "Carbonization–Activation–Acid Washing–Water Washing–Drying–Demagnetization–Fine Screening" seven-stage purification process. The acid washing stage utilizes a mixed solution of ultra-pure grade hydrochloric acid and nitric acid, subjected to reflux treatment at a high temperature of 120°C for 48 hours to effectively remove metallic impurities such as calcium, magnesium, and iron. The water washing stage involves circulating rinses with 18.2 MΩ·cm ultra-pure water until the conductivity drops to ≤ 5 μS/cm. Finally, the demagnetization stage employs superconducting magnetic separation equipment to remove micron-scale ferromagnetic impurities, ensuring that the product's metal content meets stringent ppb-level standards.

3. Precise Pore Size: Tailored for Electronics-Grade Impurity Adsorption
By precisely controlling activation temperatures (850–950°C) and steam flow rates (0.8–1.2 m³/h), we accurately regulate the pore size distribution. This ensures that over 90% of the pores fall within the 0.5–2 nm range, perfectly matching the adsorption requirements for small-molecule impurities—such as organic compounds and metal ions—found in electronic-grade chemicals. Consequently, the adsorption rate is boosted by 30–50% compared to standard activated carbon, while the saturated adsorption capacity is increased by more than twofold.

4. High-Strength Structure: Minimizing Operational Loss and Secondary Contamination
Manufactured using a physical activation method, the product features a carbon skeleton with a structural strength of ≥ 98%. It exhibits exceptional abrasion resistance, remaining intact during operations such as column packing and backwashing. This robust structure significantly reduces the risk of secondary contamination caused by the shedding of fine carbon particles. Furthermore, the packing density of our High Purity Coconut Shell Carbon for Electronics is precisely controlled within the range of 0.48–0.52 g/mL. This ensures optimal adsorption efficiency while simultaneously reducing loading costs and extending the product's service life by over 30%.

5. Customized Services: Meeting Diverse Application Requirements
Based on specific client application scenarios, we offer customized parameters—including particle size (8–200 mesh), purity (ash content: 0.1–0.5%), and moisture content (≤3%)—and provide products in various forms, such as granular, powdered, and columnar. For distinct industries—such as semiconductors, photovoltaics, and electronic chemicals—we deliver exclusive technical solutions and one-stop services, encompassing adsorption tower design, loading capacity calculations, and regeneration process optimization.

Application Scenarios and Solutions

1. Purification of Semiconductor Wafer Cleaning Solutions
In semiconductor manufacturing, the purity of wafer cleaning solutions (such as SC1 and SC2) directly impacts chip yield. Huajing’s specialized electronic-grade high-purity coconut shell carbon efficiently removes trace organic substances, metal ions, and other impurities from cleaning solutions. This reduces the metal content in the cleaning solution to below 1 ppb and controls particulate contamination to below 0.1 μm, thereby enabling clients to manufacture higher-performance chip products.

2. Purification of Electronic-Grade Reagents
In electronic-grade reagents—such as sulfuric acid, hydrochloric acid, and hydrogen peroxide—even trace impurities can compromise product performance. Through precise pore size design, Huajing’s specialized electronic-grade high-purity coconut shell carbon selectively adsorbs organic substances, metal ions, and other impurities present in these reagents. This elevates reagent purity to the UPSS grade, thereby satisfying the stringent high-purity requirements of the electronics industry.

3. High-Purity Gas Purification in the Photovoltaic Industry
In the production of photovoltaic cells, the purity of high-purity gases—such as silane and ammonia—is critical to the cells' conversion efficiency. Huajing’s specialized electronic-grade high-purity coconut shell carbon effectively removes impurities—including moisture, hydrocarbons, and metal carbonyl compounds—from these gases. This ensures a gas purity level of 99.9999%, thereby safeguarding the stability and conversion efficiency of photovoltaic cells.

4. LED Chip Manufacturing
During the LED chip manufacturing process, the presence of organic contaminants can lead to an increase in chip defects. Huajing High Purity Coconut Shell Carbon for Electronics effectively removes organic impurities from photoresists and developers, thereby reducing surface defects on semiconductor chips and enhancing the brightness and lifespan of LEDs.

Production Process: A Seven-Step Precision Workflow

1. Raw Material Selection: Dual-stage screening (manual and automated) is employed to eliminate inferior coconut shells and ensure consistent raw material quality.
2. Carbonization: Oxygen-free carbonization at 600–700°C removes volatile substances and establishes the preliminary carbon skeletal structure.
3. Activation: Steam activation at 850–950°C precisely controls pore size distribution and creates a highly developed microporous structure.
4. Acid Purification: High-temperature refluxing with a mixture of ultra-pure acids removes metallic impurities.
5. Ultra-pure Water Washing: Continuous rinsing with 18.2 MΩ·cm ultra-pure water reduces electrical conductivity.
6. Low-Temperature Drying: Vacuum drying at 120°C ensures the moisture content remains ≤3%.
7. Demagnetization & Precision Screening: Superconducting magnetic separation combined with precision screening guarantees product purity and uniform particle size distribution.

Comprehensive Quality Control

1.Raw Material Inspection: Every batch of raw materials for the High Purity Coconut Shell Carbon for Electronics undergoes rigorous testing for ash content, moisture, and density; non-conforming materials are immediately rejected.
2.Process Monitoring: Key process parameters (temperature, pressure, and duration) are recorded in real-time, with automatic alerts triggered in the event of any deviation.
3.Finished Product Inspection: Advanced instrumentation—including ICP-MS, BET analyzers, and laser particle size analyzers—is utilized to evaluate over 20 critical quality indicators.
4.Batch Traceability: A robust batch traceability system has been established, enabling full end-to-end tracking from raw materials through to the finished product.
5.Third-Party Certification: Samples can be submitted to authoritative third-party organizations (such as SGS) for independent testing to ensure full compliance with international standards.