Delrin® Spring

A true alternative to metal

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For marketing demonstration only

No compromise to safety and performance – Delrin® replaces stainless steel for the needle shield spring component

Through innovative design and detailed material knowledge, Delrin® springs can match the force output of existing steel versions while also:

  • Reducing component weight
  • Decreasing CO2 footprint
  • Enabling high volume manufacturing output
  • Saving on part cost
  • Simplifying end-of-life separation of plastic materials
Assembly-sequence-10-1a

Delrin® spring: enabled by the superior stiffness, fatigue cycling and creep resistance of Delrin® versus alternative plastics, including copolymer acetal

Spring images with text A

Compression testing of the Delrin® spring:

  • Delivers the 10-14N target spring force for smooth, confident activation.
  • Engineered for repeatable, reliable performance—perfect for next‑generation reusable devices.
  • Resists permanent deformation to maintain consistent force to ensure a trusted safety lock‑out every time.
Delrin 4D - Spring force graph

Metal vs Delrin® Spring: LCA Assessment

Cradle to grave, incineration scenario

Delrin 4D - Spring LCA (1)

Redesigning with a Delrin spring leads to >60% savings in GWP compared to traditional metal springs driven by reduced material and manufacture GWP contributions.