Thermal expansion vs. temperature

The curves of thermal expansion vs. temperature of both metal and glass should, in the case of matched seals, follow one another closely over the same specified range of temperature. 

Fig. 1. Thermal expansion vs. temperature for copper. Inconel 718, and a boron-epoxy composite.

Figure 2.34 Coefficient of thermal expansion vs. temperature for SABIC Innovative Plastics Cycoiac ABS resins.

Figure 2.66 Linear thermal expansion vs. temperature for two BASF Polystyrene resins [6].

Figure 4.71 Thermal expansion vs. temperature for Evonik Vestodur PBT plastics according to ISO 11359 [5], Note pretreatment 20 h at 120°C, heating rate 2 K/min.

Figure 6.63 Thermal expansion vs. temperature for several Evonik Industries Vestamid Nylon 12 resins [4],...

Figure 6.187 Coefficient of thermal expansion vs. temperature according to ISO 11359 for Evonik Industries Vestamid DX9300—low viscosity, heat stabilized, with improved release properties Nylon 612 resin [9].

Figure 7.23 Coefficient of iinear thermal expansion vs. temperature for Ticona GUR 4120—high bulk density, corrosion stabilized ultra high molecular weight PE resin [1],...

Figure 10.82 Coefficient of linear thermal expansion vs. temperature for Sumitomo Chemical Sumika Excel PES resins.

As the purity of material increases (and/or increase in alumina content), the value increases. The thermal coefficient of expansion of a given material is the slope of the linear thermal expansion vs. temperature. The differential magnitudes of thermal expansion between two materials are considered key design parameters and should be kept to a minimum. Increases with wt% of aluminum oxide, with 96% alumina being considered as standard. 

Fig. 18. Linear thermal expansivity vs temperature Curve. A, a typical amorphous polymer and Curve B, a typical partially ciystaUine polymer.

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