thermoplastic


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ther·mo·plas·tic

(ther'mō-plas'tik),
A classification for materials that can be made soft by the application of heat and harden on cooling.

thermoplastic

[ther′mō·plas′tik]
Etymology: Gk, thermē, heat + plassein, to mold
softening under heat and capable of being molded into shape with pressure, then hardening on cooling without undergoing chemical change.

thermoplastic

widely adaptable heat-mouldable and reusable orthotic and splinting materials; some (e.g. light-density Plastazote) can be moulded directly to the foot; others (e.g. Vitrathene) must be moulded to a cast (their plasticity temperature causes skin burns); some are suitable for chairside use (e.g. Hexcelite; Aquaplast) as they soften (when immersed in water at 65-70°C or warmed with a hair dryer for approximately 1 minute) and remain mouldable for 3-5 minutes (see Table 1)
Table 1: Common thermoplastics (3mm thickness) used in orthoses manufacture
MaterialMoulding temperature (°C)Heating time (minutes)
Hexcelite723
Aquaplast1003
Pacton1105
Evazote1306
Plastozote1408
Polythene14010
Ortholene16514
Polypropylene16515
Rohadur17018
TL61 carbon fibre18020

Note: Heating times will need to be adjusted up or down for thicker or thinner materials.

ther·mo·plas·tic

(ther'mō-plas'tik)
Classification for materials that can be softened by application of heat and hardened on cooling.

thermoplastic (thur´mōplas´tik),

adj the property of becoming soft with the application of heat, rigid at normal temperature, and again soft with the reapplication of heat. A reversible physical phenomenon.
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