Cold rubber, or cold polymerized rubber, is synthetic rubber (especially, SBR and NBR) emulsion polymerized at a relatively low temperature.
The polymerizing temperature is approximately 5℃ in the case of SBR and 5∼10℃ in the case of NBR. Since rubber molecule types have a smaller number of branches than hot rubber polymerized at high temperature (50℃) and are characterized by good stereoregularity, cold rubber has superior processability as well as the ability to produce vulcanized materials with good tensile strength, expansion and aging resistance, and flex resistance.
Except some SBR and NBR used for special purposes, most SBR and NBR available in the market are considered cold rubber.
Famous quotes containing the words cold and/or rubber:
“But what would interest you about the brook,
It’s always cold in summer, warm in winter.”
—Robert Frost (1874–1963)
“The idea that information can be stored in a changing world without an overwhelming depreciation of its value is false. It is scarcely less false than the more plausible claim that after a war we may take our existing weapons, fill their barrels with cylinder oil, and coat their outsides with sprayed rubber film, and let them statically await the next emergency.”
—Norbert Wiener (1894–1964)