The material. Polyesters can be thermosets, thermoplastics, or elastomers. The unsaturated polyester resins are thermosets. Most polyester thermosets are used in glass fiber/polyester composites. They are less stiff and strong than epoxies, but they are considerably cheaper. This record is for thermosetting polyester. It cannot be recycled.
Composition
(OOC—C6H4—COO—C6H10)n General properties
Density |
1040 – |
1400 |
kg/m3 |
Price |
*4.07 – |
4.47 |
USD/kg |
Mechanical properties |
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Young’s modulus |
2.07 – |
4.41 |
GPa |
Yield strength (elastic limit) |
*33 – |
40 |
MPa |
Tensile strength |
41.4 – |
89.6 |
MPa |
Compressive strength |
*36.3 – |
44 |
MPa |
Elongation |
2- |
2.6 |
% |
Hardness—Vickers |
9.9 – |
21.5 |
HV |
Fatigue strength at 107 cycles |
*16.6 – |
35.8 |
MPa |
Fracture toughness |
*1.09 – |
1.69 |
MPa. m1/2 |
Thermal properties |
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Glass temperature |
147 – |
207 |
°C |
Maximum service temperature |
130 – |
150 |
°C |
Thermal conductor or insulator? |
Good insulator |
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Thermal conductivity |
*0.287 – |
0.299 |
W/m. K |
Specific heat capacity |
*1510 – |
1570 |
J/kg. K |
Thermal expansion coefficient |
99 – |
180 |
p, strain/°C |
Electrical properties |
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Electrical conductor or insulator? |
Good insulator |
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Electrical resistivity |
3.3 X 1018 – |
3 X 1019 |
pnhm. cm |
Dielectric constant |
2.8 – |
3.3 |
|
Dissipation factor |
0.001 – |
0.03 |
|
Dielectric strength |
15 – |
19.7 106 |
V/m |
Thermosetting polyester is used as the matrix of this glass-reinforced deck chair.
|
Typical uses. Laminated structures; surface gel coatings; liquid castings; furniture products; bowling balls; simulated marble; sewer pipe gaskets; pistol grips; television tube implosion barriers; boats; truck cabs; concrete forms; lamp housings; skylights; fishing rods.