Thermoplastics range GPLAST

GRANDO offers its customers a full range of amorphous or semi-crystalline thermoplastics which can be easily identified by their product reference beginning with the letters GPLAST. This range includes all the machinable thermoplastics most commonly used in industry.

These can be grouped into four distinct categories according to their maximum temperature of use (Tu) and their degree of crystallinity. These four categories respectively comprise mass-market basic thermoplastics with a Tu below 65 °C, industrial thermoplastics with a Tu of between 65 °C and 120 °C, technical thermoplastics with a Tu of between 120 °C and 230 °C, and finally high-performance thermoplastics with a Tu above 230 °C. Each of these categories can in turn be divided into two sub-categories according to whether the material is amorphous or semi-crystalline (see table and diagram).

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Generally speaking, the thermal and/or chemical performance of machinable thermoplastics depends on their Tu. It should be noted that the Tu of a thermoplastic is below its melt temperature (Tm), i.e. the temperature at which the material becomes liquid. In terms of physical properties, the glass transition temperature (Tg) of a thermoplastic represents the temperature interval over which the material passes from a rubbery state to a glassy state, i.e. a solid state.

GRANDO requires all its suppliers of thermoplastics to have their products certified according to the two European REACH and RoHS directives concerning the use of hazardous substances.