This is made from the natural sap or serum that is harvested from the rubber tree and then is processed. The sap is harvested by a primitive technology called “tapping” which consists of making small incisions on the tree and collecting the sap in containers. Mattresses made from 100% natural latex are very hard to find on the market because of the cost involved in extraction and manufacturing.
Synthetic (Man Made)
This means that the material used for production of latex mattresses is human made with technology known as polymerization and includes binding together single molecules of a monomer such as styrene mixed with surfactants. The end result is a material that has similar characteristics to the natural one, and is much cheaper. The down side is that this material has shorter durability and is not as firm as the natural latex.
The term blended signifies that this latex is made from mixing natural and synthetic latex usually in ratios of 80% synthetic and 20% natural. There is also a blend of equal parts natural and synthetic latex, but this is rare and is reserved for premium mattresses. The blended latex binds together the benefits of the two main latex types such as the durability and firmness of the natural and the low cost of the synthetic latex.
Researching for latex mattresses has surely popped up the words “Dunlop” and “Talley”. These aren`t types of latex, but the technologies used to process the extracted latex into the inner core of the mattress.
This is the traditional processing method an is employed since 1920`s. The liquid sap from the trees is poured into moulds and heated or baked into its solid form. Then the mould is gradually cooled and the processed latex is removed. This is the Dunlop latex core of the mattress.
This process is similar to the Dunlop processing method, with the difference of adding two extra steps. After the sap is poured into the mould, the mould is sealed and a vacuum is created. This is the first additional step, and is used to distribute the liquid serum evenly throughout the mould. The serum is theft flash-frozen (the second additional step) before it is baked into its solid form. Then the moulds are slowly cooled and the talalay latex core is extracted.