Product overview
Spectrum S-Flex 98A filament is a hard-elastomer TPU for functional parts that need controlled flexibility, impact resistance and durability. Its polyether polyurethane formulation resists hydrolysis, many common industrial oils and chemicals, and dynamic forces. Low shrinkage, strong first-layer adhesion and reduced stringing make it a practical flexible material for engineering teams, workshops and makers.
Controlled flexibility with durable performance
S-Flex 98A combines useful flex with increased rigidity, helping parts hold their shape while bending or absorbing impacts. This makes it a better fit than a soft, rubber-like TPU when a component must remain flexible but still feel firm and supportive.
High tensile and tear resistance support parts exposed to stretching and repeated movement. Resistance to degradation caused by water suits parts exposed to moisture, while resistance to common oils and industrial chemicals benefits selected workshop and machine environments.
Functional parts for engineering and everyday use
The material is well suited to gaskets, flexible seals, bumpers, vibration dampers and energy-absorbing elements. It can also be used for guides, sleeves, hinges, snap-on parts, spacers and flexible tapes.
For engineering, maintenance and product-development work, Spectrum S-Flex 98A is a strong choice for protective housings, device covers and spring damping elements. It also performs well in thermal-insulating components and durable flexible parts. The same combination of firmness and flexibility works for one-off repairs, prototypes and recurring workshop jobs.
More manageable printing for a flexible filament
The hard-elastomer profile reduces the risk of filament deformation in the feed system. This supports a smoother workflow and slightly faster printing than softer, more compressible elastomers. Very good first-layer adhesion and low processing shrinkage help limit edge lift, while reduced stringing during idle movements keeps detailed functional prints cleaner.
These processing advantages make S-Flex 98A approachable for users who need flexible performance without choosing one of the softest TPU grades. It is suitable for desktop production of practical parts as well as occasional maker projects.
When to choose S-Flex 98A
Choose this grade when flexibility must be balanced with increased rigidity, shape retention and resistance to demanding use. It offers a firmer hard-elastomer response than soft TPU while retaining the bending, damping and impact-handling behaviour needed for functional flexible parts.
For workshops and engineering teams, that balance covers a broad range of protective, sealing and damping components with one material. For individual users, it provides a practical route to durable flexible prints without feeling excessively soft.