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This resulted in the commercialization of "Uniroyal TPR" thermoplastic rubber. [5] [6] TPVs are a blend between a thermoplastic matrix and vulcanized rubber - combining the properties of both. A combination of elastomeric properties, including compressibility, tension sets, aging performance, and chemical resistance, characterizes TPVs.
Vulcanization, in common with the curing of other thermosetting polymers, is generally irreversible. The word was suggested by William Brockedon (a friend of Thomas Hancock who attained the British patent for the process) coming from the god Vulcan who was associated with heat and sulfur in volcanoes .
Other specialty rubbers may also be vulcanized, such as nitrile rubber (NBR) and butyl rubber (IIR). Vulcanization, in common with the curing of other thermosetting polymers, is generally irreversible. Efforts have focussed on developing de-vulcanization (see tire recycling) processes for recycling of rubber waste but with little success.
[1] [third-party source needed] Due to the thermosetting nature of the material, liquid silicone injection molding requires special treatment, such as intensive distributive mixing, while maintaining the material at a low temperature before it is pushed into the heated cavity and vulcanized. Chemically, silicone rubber is a family of thermoset ...
EPDM is an M-Class rubber under ASTM standard D-1418; the M class comprises elastomers with a saturated polyethylene chain (the M deriving from the more correct term polymethylene). EPDM is made from ethylene, propylene, and a diene comonomer that enables crosslinking via sulfur vulcanization.
RTV silicone rubber can be used to cast materials including wax, gypsum, low-melt alloys/metals, and urethane, epoxy, or polyester resins (without using a release agent). A more recent innovation is the ability to 3D print RTV silicones.
These are: (1) Cured (or vulcanized) elastomers, (2) Uncured elastomers, and (3) plastomers. Cured Elastomers (often referred to as Thermoset) – Thermosets are synthetic rubbers that have undergone the vulcanization or "Curing" process. Seams of materials are bonded by adhesives or chemicals, which over time weaken and separate unless ...
Vulcanized rubber. Bakelite, a phenol-formaldehyde resin used in electrical insulators and plasticware. Duroplast, light but strong material, similar to Bakelite formerly used in the manufacture of the Trabant automobile, currently used for household objects; Urea-formaldehyde foam used in plywood, particleboard and medium-density fibreboard.