PPS – PPS is most commonly known for having the broadest resistance to chemicals of any advanced engineering plastic.It also has great processability, is inherently flame resistant in most grades, and has excellent stress and cracking resistance when exposed to aircraft and automotive fluids, alcohols, acids, and more. With a flexural modulus of 22,000 psi, Ultem® offers predictable stiffness and strength up to 200✬/392✯. Ultem® – PEI resins such as Ultem® offer high stiffness and strength, superior elevated thermal resistance, and broad chemical resistance.PEEK also has superior creep resistance, excellent fatigue and stress-crack resistance, and very low moisture absorption. PEEK – An all-around powerhouse, PEEK combines high stiffness (24,000 psi) and strength (14,000 psi) with outstanding chemical resistance and a continuous service temperature of 500✯.PAI maintains its properties at extreme temperatures and is the highest-performing melt-processable plastic. PAI (Torlon®) – This plastic offers both stiffness and strength, with certain grades of Torlon® plastic measuring a flexural strength of 24,000 psi and a tensile strength of 18,000 psi.Homopolymer acetal (Delrin®) is extremely stiff, with a flexural modulus of 14,300 psi, and provides superior wear and abrasion properties as well as excellent chemical resistance. Acetal – This stiff, high-strength, low-friction engineering plastic is easy to machine and can hold complex, tight tolerances.These properties are often needed in conjunction with one another in demanding applications. Stiffness of plastic is the ability of the material to distribute a load and resist deformation or deflection (functional failure). The strength of a plastic (typically referred to as tensile strength or ultimate strength) is how much stress a plastic can withstand without breaking when it is stretched or pulled (physical failure). This mixing of terms can result in confusion as to the difference between stiffness and strength. In addition to flexural modulus, the stiffness of plastics is sometimes referred to as flexural strength or tensile modulus. The higher the flexural modulus, the stiffer the material the lower the flexural modulus, the more flexible it is.
The stiffness of plastics is described by flexural modulus (the ability of a material to bend), which is measured in pounds per square inch (psi). Stiffness is one of the key mechanical properties of plastic, along with strength, hardness, and toughness.
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