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A sex doll (also love doll or blowup doll) is a type of sex toy in the size and shape of a sexual partner for aid in masturbation.

The sex doll may consist of an entire body with face, or just a head, pelvis or other partial body, with the accessories (vagina, anus, mouth, penis) for sexual stimulation.

The parts are sometimes vibrating and may be removable or interchangeable.

Sex dolls exist in many forms, but are distinguished from sex robots, which are anthropomorphic creations designed to be able to exhibit more complex interactions.

Silicones, also known as polysiloxanes, are polymers that include any inert, synthetic compound made up of repeating units of siloxane, which is a chain of alternating silicon atoms and oxygen atoms, combined with carbon, hydrogen, and sometimes other elements.

They are typically heat-resistant and either liquid or rubber-like, and are used in sealants, adhesives, lubricants, medicine, cooking utensils, and thermal and electrical insulation.

Some common forms include silicone oil, silicone grease, silicone rubber, silicone resin, and silicone caulk.

Thermoplastic elastomers (TPE), sometimes referred to as thermoplastic rubbers, are a class of copolymers or a physical mix of polymers (usually a plastic and a rubber) which consist of materials with both thermoplastic and elastomeric properties.

While most elastomers are thermosets, thermoplastics are in contrast relatively easy to use in manufacturing, for example, by injection molding.

Thermoplastic elastomers show advantages typical of both rubbery materials and plastic materials.

The benefit of using thermoplastic elastomers is the ability to stretch to moderate elongations and return to its near original shape creating a longer life and better physical range than other materials.

The principal difference between thermoset elastomers and thermoplastic elastomers is the type of cross-linking bond in their structures.

In fact, crosslinking is a critical structural factor which imparts high elastic properties.