TPE Fluid Seal 101

What are Thermoplastic Elastomers?

Thermoplastics are polymers (in this case, a plastic) that melt at a certain temperature and reharden upon cooling. Elastomers are flexible, rubber-like materials with superb elastic properties. Thermoplastic elastomers (TPEs) are elastomeric materials that can be molded into precise, complex shapes that are highly reproducible. This makes TPEs ideal for fluid-sealing interfaces in life science instruments that require precision performance over a range of mid- to high-volume applications.

TPE fluid seals can bond with plastic components via overmolding. This production method eliminates a secondary labor step, making assembly simple and cost effective.

Where are thermoplastic elastomer fluid seals used in life science applications?

Common TPE life sciences fluid sealing applications:

  • Tube to cartridge
  • Cap/lid to container/bottle/vial
  • Instrument to chip
  • Between two microfluidics
  • Connector to manifold
  • and many more
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Fluid-sealing guide

Complex shapes, small features, intense pneumatic pressures—manufacturing a stable fluid-sealing interface can be complicated. Download our TPE fluid-sealing guide to learn how Enplas Life Tech can help.

Examples of thermoplastic elastomer fluid seals

TPE fluid-sealing interfaces are highly customizable and can accommodate almost any combination of components. The images below demonstrate TPE fluid seals overmolded to plastic substrates. Independent standing gasket-like fluid seals are also useful in various cases (e.g., when it is used between non-plastic materials; when the fluid sealing interface is replaced more frequently than the surrounding components). Part A is the bonding component (the component to which the elastomer binds), Part B is the fluid sealing interface (elastomer), and Part C is the docking component (e.g., a tube, pipette, flat surface) that shuts against the elastomer fluid seal to introduce or discard fluid.

If you experience leaking issues during the transfer of fluid (liquid or air) from one component to another, placing a thermoplastic elastomer fluid sealing between them may be the solution.