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Rotary moulded Hot Tubs Explained: information on what is meant by rotationally molded hot tubs.

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The hot tub industry has been enjoying
large profit margins for years, lining the pockets of hot tub
manufactures and dealers alike. Let’s do the math on this; many hot
tubs on the market today are the same price as small cars yet, there are
more than 10,000 components that go into a car, a large majority of them
have to be custom made in a very costly way, such as metal pressing and
castings, yet in a hot tub there are less than 500 components with
almost all but one (the shell) being interchangeable between tubs and
most being outsourced to other component manufacturers. 

Does this make

No certainly

Although cars are made in 100,000 and hot tubs made in the 10,000 there is still a world of difference in the
cost of manufacturing. So why do they still cost the same as small cars?

The only reason I can see is that there
is a whole lot of profit being made somewhere.


lady in hot tub

The hot tub industry has typically centred
round one core shell manufacturing method for years, and this being the
most expensive part of a tub is the most important. They are generally
made using vacuum moulding where a sheet of acrylic is heated over a
mould then sucked in using a vacuum to form the contours of the

hot tub
there is a new kid on the block that is challenging these methods
and causing waves in hot tub world! Excuse the pun! 

Rotary moulding, rotationally
molded or rotomoulded
products have been around for many years in the form of large
storage tanks and containers; however this method has only
recently been applied to tubs.

Rotationally molded hot tubs are made from
one single mould enabling them to be made in a one step production

The process uses a cast aluminium mould
that is filled with thermoforming plastic granules, which is then placed
in a giant oven and spun in three axis for about an hour which allows
all of the granules to fuse together uniformly around the inside of the
mould. Extra material naturally gathers around corners making them extra
strong. Once the cooking process is complete, the mould is then taken
from the oven and cooled using air and water jets, for around another
hour. The tub is then removed from the mould and ready to be fitted out
with pipe work, jets, heaters, pumps and controllers.

This fast production time obviously
saves lots of money in the production of a tub and therefore these
savings can be passed onto the new owner of these tubs. This method of
production also has its benefits over conventionally made tubs, as they
have no metal or wood sub frames that can rust or rot away, they are
resilient to the elements and are very hard to crack.

This tub is now often used as an entry
level tub to allow those who may not have been able to afford one in the
past to get into hot tubbing! 




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