Activated Carbon
Quality Standards
Every batch of Raj Carbon tested to ASTM standards in our in-house laboratory. WQA Gold Seal certified. Your quality is non-negotiable to us.
Every Batch. Every Time.
Zero Compromise.
At Raj Carbon, quality is not a department it is our culture. From raw coconut shell selection to the final shipment, every step is governed by rigorous testing protocols aligned with ASTM international standards.
Our in-house laboratory is equipped for E-11 Sieve testing and all standard activated carbon characterisation tests. No batch leaves our facility without a full test certificate matching the buyer's specification.
This commitment is recognised globally evidenced by our Water Quality Association (WQA) Gold Seal Listing, which is required by municipal water authorities across the USA and Europe.
ASTM Standards We Test Against
Every parameter explained in plain language. Our in-house lab tests each batch against these internationally recognised ASTM standards before shipment.
Particle Size Distribution
Tests the mesh size distribution of granular activated carbon using ASTM E-11 standard sieves. Ensures consistent 4×8, 6×12, 6×16, 8×16, or 8×30 mesh gradation per specification.
Iodine Number
The primary indicator of adsorption capacity. Measures milligrams of iodine adsorbed per gram of carbon. Our grades range from 900 to 1,300 mg/g industry-leading values from coconut shell carbon.
Carbon Tetrachloride Activity
CTC activity measures the ability of activated carbon to adsorb vapour-phase organic compounds. Critical for air purification and solvent recovery applications. Our carbon achieves 45–65% CTC.
Apparent Density
Measures the weight per unit volume of carbon. Essential for vessel sizing and engineering design. Our GAC grades maintain 0.44–0.52 g/cc apparent density across all mesh sizes.
Ball Pan Hardness
Measures attrition resistance how well carbon granules resist breaking and dusting during backwash cycles. Raj Carbon's coconut shell carbon consistently achieves 95%+ hardness, minimising carbon loss.
Moisture Content
Tests the moisture percentage in activated carbon. Ensures maximum adsorption capacity and accurate weight measurements per shipment. All grades maintained at 5% or below.
Total Ash Content
Measures inorganic mineral residue after combustion. Low ash content is critical for food-grade and pharmaceutical applications. Our standard grades maintain ash below 3%, acid-washed below 1%.
pH of Aqueous Extract
Determines the pH of the water extract from activated carbon. Important for system compatibility. Standard GAC grades: pH 9–11. Acid-washed grades: pH 6–8 for neutral system compatibility.
Acid Washed Carbon
Ultra-High Purity
Acid washing is a post-activation treatment that removes trace metals, reduces ash content, and neutralises the pH of activated carbon. Raj Carbon operates a dedicated acid wash and dryer facility one of the few manufacturers in India capable of this process at scale.
The process involves immersing activated carbon in hydrochloric acid solution, then thoroughly rinsing with deionised water and drying in our controlled dryer. The result: carbon with ash below 1%, pH of 6–8, and ultra-low trace metals.
Applications Requiring Acid Washed Carbon:
Acid Wash vs. Standard Carbon
Certified. Recognised. Trusted.
Have a Quality Specification?
We Can Match It.
Send us your technical datasheet. Our lab team will confirm which of our grades meets your requirements.