How Cair Works

Cair is an Activated Coconut Charcoal (or Activated Coconut-based Carbon) based air purifier that utilizes the characteristics of activated Coconut charcoal to adsorb odour and chemical toxins from the air.

Charcoal works on the principle of Adsorption (not absorption).

What is Adsorption?

It is a chemical reaction where the atoms, ions or molecules of a gas, liquid or solid element adhere to the surface of another element, creating a film of adsorbate on the surface of the adsorbent.

In Cair, the Activated Coconut Charcoal is the adsorbent while the molecules of bad odour and chemical toxins captured by it form the adsorbate film in its pores.

The Difference between Adsorption and Absorption

Absorption is a process where a fluid is dissolved by a liquid or a solid element (absorbent). The molecules of the fluid assimilate through the bulk of the liquid/solid absorbent. The process is unaffected by temperature and occurs at a uniform rate throughout the material.

Adsorption, on the other hand, only occurs at the surface – hence the need to have fine granules of activated coconut charcoal that have an extremely large (combined) surface area. It occurs better in lower temperatures and the rate of adsorption rapidly increases until it reaches saturation.

The Use of Activated Carbon for Air Purification

Ancient Egyptians, way back in 3150 BC, discovered charcoal’s ability to absorb odours. Since then, charcoal has been used in a variety of ways as a way for purifying the air. It wasn’t, however, till the Industrial Revolution in Europe that the use of charcoal became widespread.

Since then, charcoal and – more specifically – activated charcoal has been used in various applications such as industrial air and water purifiers, treating ingested poisoning, in gas masks, soil nutrition, and much more.

What is Activated Charcoal?

Charcoal is a black residue containing, primarily, Carbon – obtained by burning of wood, bamboo or coconut shells in the absence of oxygen (pyrolysis).

When created, the charcoal-surface contains a number of pores. When activated (a chemical reaction to increase the number of pores), 1 gram of charcoal can have a surface area between 500sq. m. to 3000 sq. m.

The basic math is this: The higher the surface area, the more chemical toxin and odour molecules it can adsorb.

Why Activated Coconut Charcoal?

In Coconut Charcoal, micro-pores (less than 2 nanometre diameter) cover almost 90-95% of the entire charcoal surface. Compared to 1 gram of wood-based charcoal, which has larger pores (Macro-pores or more than 50nm diameter), there are more pores on Coconut charcoal.

As a result, Coconut Charcoal adsorbs more harmful chemical toxin and bad odour molecules than regular charcoal.

Coconut Charcoal also has higher pore-volume (millilitres per gram) than regular charcoal – in other words, 1 gram of coconut charcoal can hold more molecules of chemical toxins and bad odour, than 1 gram of regular charcoal.

Finally, steam-activated coconut charcoal (which is what Cair contains), creates additional pores within each pore, thereby increasing the adsorption capability of (the already more adsorbent) coconut charcoal.

Also, steam-activation is a natural process that does not involve any chemicals – which is not the case with regular charcoal activation, which involves several non-environment friendly chemicals.

Are there any laboratory tests conducted to prove the worthiness of Activated Coconut Charcoal as an air purifier?

There are plenty of laboratory tests that support the use of Activated Coconut Charcoal for the purification of various chemicals in the air.

Here are some of them:

In some cases, activated charcoal has been used in place of activated coconut charcoal. Please note: activated coconut charcoal has effectively the same properties as regular activated charcoal, only better!

What Kind of Chemicals does Cair Adsorb?

Cair adsorbs the following chemical, toxin and odour molecules from the air around you (in varying degrees):


Cyclohexanol Hydrogen Cyanide Paint & Redecorating Odours
Acetic Acid Cyclohexanol Hydrogen Fluoride Palmitic Acid
Acetic Anhydride Cyclohexene Hydrogen Iodide Paradichlorbenzine
Acetone Decane Hydrogen Selenide Pantane
Acetylene Dibromoethane Hydrogen Sulfide Pentanone
Acrolem Dichlorobenzene Incensen Pentylene
Acrylic Acid Dichlorodifluoromethane Indole Pentyne
Acrylonitrile Dichloroethane Iodine Perchloroethylene
Alcoholic Beverages Dichloroethylene Iodoform Perfumes, Cosmetics
Amines Dichloroethyl Irritants Phenol
Ammonia Dichloromonofluormethane Isophorone Phosgene
Ameyl acetate Dichloronitroethane Isoprene Pitch
Amyl Alcohol Dichloroprpane Isopropyl acetate Poison Gases
Amyl Ether Dichlorotetrafluoroethane Isopropyl Alcohol Pollen
Aniline Diesel Fumes Isopropyl Ether Popcorn and Candy
Asphalt Fumes Diethylamine Kerosene Poultry Odours
Automobile Exhaust Diethyl Ketone Kitchen Odours Propane
Benzene Dimethylaniline Lactic Acid Propionaldehyde
Body Odours Dimethylsulfate Menthol Propionic Acid
Borane Dioxane Mercaptans Propyl Acetate
Bromine Diproyl Ketone Methane Propyl Alcohol
Burned Flesh Ethane Methil Acetate Propyl Chloride
Burned Food Ether Menthyl acrylate Propyl Ether
Butadiene Ethyl Acetate Methyl Alcohol Propyl Mercaptan
Butane Ethyl Acrylate Methyl Bromide Propylene
Butanone Ethyl Alcohol Methyl Butyl Ketone Propyne
Butyl Acetate Ethyl Amine Methyl Cellosolve Putrefying Substances
Butyl Alcohol Ethyl Benzene Methyl Cellosolve Acetate Putrescine
Butyl Cellosolve Ethyl Bromide Methyl Chloride Pyridine
Butyl Chloride Ethyl Chloride Methyl Chloroform Resins
Butyl Ether Ethyl Ether Methyl Ether Rubber
Butylene Ethyl Formate Methyl Ethyl Ketone Sauerkraut
Butyne Ethyl Mercaptan Methyl Formate Sewer Odours
Butyraldehyde Ethyl Silicate Methyl Isobutyl Ketone Skalote
Butyric Acid Ethylene Methyl Mercaptan Slaughtering Odours
Camphor Ethylene Chlorhydrin Methylcyclohexane Smog
Caprylic Acid Ethylene Dichloride Methylcyclohexanol Sour Milks
Carbolic Acid Ethylene Oxide Methylcyclohexaone Stoddard Solvent
Carbon Disulfide Essential Oils Methylene Chloride Styrene Monomer
Carbon Dioxide Eucalyptole Monochlorobenzene Sulfur Dioxide
Carbon Monoxide Fertilizer Monofluorotri Cloromethane Sulfur Trioxide
Carbon Tetrachloride Film processing odors Naphtha Sulfuric Acid
Cellosolve Fish Odours Naphthziene Tetrachloroethane
Cellosolve Acetate Floral Scents Nitric Acid Tetrachloroethylene
Cheese Fluorotrichloromethane Nitro Benzenes Tobacco Smoke Odour
Chlorine Formaldehyde Nitroethane Toilet Odours
Chlorobenzene Formic Acid Nitrogen Dioxide Toluene
Chlorobutadiene Gangrene Nitroglycerine Toluidine
Chloroform Garlic Nitromethane Trichlorethylene
Chloronitropropane Gasoline Nitropropane Trichloroethane
Chloropicrin Heptane Nitrotoluene Turpentine
Citrus and other Fruits Heptylene Nonane Urea
Cleaning Compounds Hexane Octalene Uric Acid
Coal Smoke Hexylene Octane Valeric Acid
Creosote Hexyne Onions Valericaldehyde
Cresol Hydrogen Organic Chemicals Varnish Fumes
Crotonaldehyde Hydrogen Bromide Ozone Xylene
Cychlohexane Hydrogen Chloride Packing House Odours

If you have any more questions regarding Cair and how it works, please get in touch with us!