Injection moulding is a great process if you're working with plastics. Injection moulding is great for producing a high quantity of the same type of product. Sometimes the equipment needed is rather costly though.
I think you are talking about rtv which uses a prototype part which must be finished out very smooth. In this process you take the prototype and make a cavity and core using rubber. At this point the rubber will harden and a gate and vent will be added. Then they will pour a plastic that is mixed with hardner and dye of choice. The cemicals will take some time to set at which point the rubber parts will be seperated and you have your plastic part. This way is cheeper than injection moulding but the life span of the tool is short depending on the complexity of the part.
many companies manufacture high quality injection moulding but our company is one of the best in making good plastic mouldings. We routinely mold ultra-high heat resins modified with carbon, brass, stainless steel and flame retardant agents. If you want to get it then our company is the best.
Injection moulding can be performed with a variety of materials, including: glasses, metals, elastomers, confections and, most commonly, thermosetting and thermoplastic polymers. This process can be used in various circumstances, particularly when producing: large shot weights, high volumes of small to medium size parts, incorporating bonded inserts, achieving close dimensional tolerances and making components that require uniformity or consistency of colour. Some examples of where injection moulding components are used include: coloured instrument boots, o rings, drive coupling assemblies and plastic parts.
Los Angeles, United States 
