Classification of activated carbon
Classification of activated carbon
As shown, activated carbon is divided into 5 types based on shape. Each type of activated carbon has its own use.
• Powder form: Activated carbon is finely ground into powder with size from 0.2mm to 0.5mm. This type has the cheapest price and is used in a lot of equipment RO water purifiers, alum water treatment systems, cosmetics (toothpaste, scrubs, …).
• Granular: Activated carbon is crushed into tiny particles with sizes from 1mm to 5mm. This type of coal is more difficult to wash off and blow away than the powder form. Activated carbon particles and often used in industrial water filtration systems.
• Tablet form: This is a powdered activated carbon that is compacted into hard pellets. Each tablet is about 1 cm to 5cm in size and is used mainly in air purifiers. Due to the compaction, the size of the molecular pores in the coal pellets will be smaller, thereby the ability to filter bacteria is also better.
• Sheet form: In fact, these are foam sheets impregnated with activated carbon powder, sized to be processed according to the needs of use. Activated carbon sheet is commonly used mainly in air purifiers.
• Tubular: Formed by heat treatment of fuel coal tubes. Each activated carbon tube is usually 1 cm to 5cm in diameter and is used mainly in large-scale water treatment systems.
The criteria to pay attention to of activated carbon
When choosing to buy activated carbon filter material, customers need to pay attention to the following criteria:
• Iodine: This is an index that represents the surface area of the pores. Normally, activated charcoal will have an Iodine index of about 500 to 1,400mg/g. The higher this area, the more pores there are in the activated carbon molecule, making it better able to absorb water.
• Hardness: This index depends on the type of activated carbon: Activated carbon in tablets and tubes will have high hardness due to compaction. Charcoal hardness indicates resistance to abrasion and washout. Therefore, choosing the right type of activated carbon for your needs is very important.
• Pore Volume: This index represents the distance between the voids present in the activated carbon molecule. The larger the volume, the lower the density of pores (low Iodine), which will make the filterability of the coal worse.
• Particle size: Similar to the hardness index, the particle size of activated carbon will depend on the type of coal. The smaller the particle size (powder form), the higher the filtering capacity of activated carbon.
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Post time: Oct-16-2025