| What is Latex Rubber?
If you just want to know about the latex rubber we sell on eBay
scroll down to the bottom.
The word latex comes from the Latin for milk lac.
When crude forms of rubber were brought back from South America
in the 18th century it was noticed that it would remove pencil
marks from paper when rubbed, paper was expensive then, hence
the name rubber. A small piece of rubber sold for this purpose
was very expensive then.
Most natural rubber originates from the Hevea tree which exudes
a milky liquid when damaged which sets on contact with air generally
thought to protect the tree from fungal and insect damage and
grazing, technically this is not sap which runs much deeper within
the tree; the lactiferous producing cells lie just beneath the
bark.
Many plants produce a milky sap such as dandelions
but the Hevea tree is farmed because it can be milked
by cutting into the bark and collecting the liquid without destroying
the tree. Chewing gum used to be made from chicle a gum collected
from the Manilkara Chicle tree, today most is made from synthetic
rubber.
The British introduced the rubber tree to their colonies in the
East Sri Lanka, India, Malaysia . The Dutch also created
plantations in their colonies in Indonesia.
It was discovered that ammonia solution prevented the coagulation
of raw collected latex so it could be transported to a central
processing site.
It was also found that turpentine and naphtha would dissolve the
raw latex to make a rubber solution.
Its main use then was for waterproofing garments and footwear
buy these degraded quickly, and became sticky and smelly and needed
replaced quite often.
Hard rubber differs from latex rubber due to the way it is processed
from collection.
When the latex is extracted form the tree it is either kept in
liquid form (latex concentrate) or allowed to dry out (dry rubber).
Both are stabilised by a process called vulcanisation using heat
(to speed up the reaction and to drive off the water content)
and sulphur (or sulphur donors) plus the addition of other stabilisers.
This process cross links the polymer chains resulting in a product
that recovers after deforming or stretching. Harder more chemically
resistant rubbers can be produced by controlling the heat and
adjusting the levels of the vulcanising agents. The discovery
of this process is attributed to Charles Goodyear. Vulcanised
dry rubbers main use was for vehicle tyres, Goodyear Tyres
used the name as an acknowledgement of his discovery.
Dry/hard rubber is used for tyres, tubing, hoses, footwear, automotive
components, engineering parts, adhesives, and some household appliances
Latex rubber is processed from the liquid form and undergoes
a lighter vulcanisation process to make a soft very stretchy product,
it is how ever this leaves it more vulnerable to chemicals and
degradation from heat and light. This product is used to make
dipped or moulded items such as gloves, condoms and balloons,
foamed to make latex foam or extruded to make elastic thread.
Some people are allergic to latex to varying degrees, either to
the natural proteins in the latex, the chemicals used in the processing
or to the talc or corn starch used to dust the finished product
which carries fine particles of latex into the air. In severe
cases contact can result in an anaphylactic reactions (rare),
less severe cases causes dermatitis, eczema, rhinitis other forms
of mild discomfort.
The latex rubber we sell here on eBay is specifically designed
for use in clothing.
It does have other uses such as exercise bands, gaskets and vacuum
beds. It has a smooth side which can be carefully polished to
a high shine and a matte, rougher side.
I cannot recommend its use for the repair of dry/wet suits, hovercraft
skirts, any application where it will come into contact with mineral
oils or solvents, prolonged exposure to heat and light, or the
for the repair of styrene butadiene or neoprene (both synthetic
rubbers).
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