PES (Polyethersulfone) is an amorphous high-performance special engineering plastic belonging to the sulfone polymer family. Its molecular chain has alternating ether bonds and sulfone groups, with high base density. Core advantages include excellent heat resistance, hydrolysis resistance, chemical corrosion resistance, and outstanding electrical insulation performance, along with good toughness and dimensional stability, can be used for a long time in high-temperature environments, non-toxic, can be steam-sterilized, making it a key material in high-end electronics, medical, and aerospace fields. The overall density fluctuation of PES is small, mainly affected by modification types and filling components. Different types and modified versions of PES have slight density variations. Accurate grasp of its density parameters is the core of high-end precision component design, process optimization, and performance guarantee.
General-purpose pure PES: 1.37–1.39 g/cm³, typical value 1.38 g/cm³. The amorphous structure gives it excellent thermal stability and dimensional accuracy, with no obvious melting point, good processing performance, suitable for various high-end basic precision components.
Glass fiber reinforced PES (10–30%): 1.46–1.63 g/cm³. The higher the glass fiber content, the more obvious the density increase. While retaining PES's core performance, it significantly improves the material's strength, rigidity, and creep resistance, suitable for high-load, high-temperature working conditions.
Mineral-filled PES: 1.43–1.58 g/cm³. Filling content is positively correlated with density. It mainly adds minerals such as talc and glass beads to focus on improving dimensional stability, reducing anisotropy, and controlling production costs.
Flame-retardant PES (natural flame retardant, no need for addition): 1.37–1.39 g/cm³. The material itself has UL94 V-0 flame retardancy, no need to add additional flame retardants, density consistent with pure PES, environmentally friendly and stable in performance, suitable for high-end safety scenarios.
Medical/food-grade PES: 1.37–1.39 g/cm³. Passed FDA and USP Class VI certifications, with minimal density fluctuation. The core guarantee is hygiene and safety and resistance to steam sterilization, non-toxic, no odor, suitable for medical and food contact scenarios.
Glass fiber + mineral composite PES: 1.48–1.65 g/cm³. It combines the high strength of glass fiber with the dimensional stability of minerals, with density between single reinforcement systems, more balanced comprehensive performance, suitable for complex high-end precision structural components.
This density parameter is the core basis for the design of high-precision products such as medical diagnostic equipment, filter membrane modules, aerospace structural components, high-end electronic connectors, semiconductor packaging materials, and automotive engine peripheral parts. The amorphous structure and excellent hydrolysis resistance ensure stable dimensional accuracy under repeated high-temperature sterilization, strong chemical corrosion, and extreme temperature conditions. Density calculation is also key data for product strength check, mold design, assembly tolerance matching, and injection molding process optimization, while supporting the play of its core characteristics of ultra-high heat resistance, high insulation, and chemical corrosion resistance.
