The Science Behind Spira Elastomers

Elastomer chemistry is an integral part of the Spira Systems identity. We are always seeking ways to improve our rubber’s performance and longevity.

As a standard, Spira Systems offers two proprietary elastomer systems with its Conventional, SPIRA®, and SPIRA® TNT power sections.


SPR-20 is Spira Systems’ newest elastomer for power sections. SPR-20 has improved mechanical properties at elevated temperatures and experiences 25% less swell due to temperature compared to its predecessor SPR-15 HRD. Spira customers have had multiple successful runs with SPR-20 rubber in tough drilling applications with both water and oil-based fluids at elevated temperatures. Stators lined with SPR-20 sized correctly for the application can handle downhole drilling temperatures up to 320°F.


SPR-15-HRD is our standard hard rubber compound formulated to maximize torque for conventional stators. The SPIRA® -HRD rubber has excellent oil-based fluid resistance at temperatures up to 275°F as well as strong tear resistance.