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Teknor Apex’s New TPE-based Plunger Stoppers Enhance Syringe Function: NPE2018

Published on 2018-04-04. Author : SpecialChem

TAGS:  Medical     NPE2018     Rubber Replacement     Cost Efficiency    

Syringes with Stopper Shown in Black
Syringes with Stopper Shown in Black
Teknor Apex Company will introduce medical-grade thermoplastic elastomers (TPEs) for injection molded plunger stoppers at NPE2018 (Booth S22045). New TPEs provide improved syringe performance, are less costly and easier to mold than natural and isoprene rubber, and provide processing advantages over thermoplastic vulcanizate (TPV) elastomers.

Stoppers Molded of Medalist® TPEs Perform Well


Stoppers molded from the new Medalist® TPEs perform well in both glass and plastic syringe barrels, achieving a consistent piston release and travel force due to a low coefficient of friction. The compounds can be over-molded onto plungers, eliminating an assembly step. In addition to grades for over-molding onto polypropylene, specialty grades are available that, unlike TPVs, can be over-molded onto engineering resins like polycarbonate, ABS, PC / ABS, acrylic, acetal, PBT, and COPE. Also unlike most TPVs, the Medalist TPEs do not require pre-drying.

Medalist® TPEs


  • The Medalist TPEs exhibit improved compression set in comparison with competing TPEs, making possible a more secure seal. 
  • The compounds can be molded in high-cavitation tooling. 
  • All grades are sterilizable and are available in natural or black colors. 

Advantages Over Rubber


  • The Medalist compounds provide substantial advantages over rubber, which has been the predominant material for use in syringe stoppers. 
  • TPEs avoid the curing step required in rubber processing, eliminating concerns about extractables and leachables, and, unlike rubber, their scrap can be recycled. 
  • As thermoplastics, TPEs process in considerably shorter molding cycles and lend themselves to more intricate designs and tighter dimensional tolerances.

Properties of Four Medical TPEs for Plunger Stoppers in Syringes
Properties of Four Medical TPEs for Plunger Stoppers in Syringes
Source: Teknor Apex Company

Ross van Royen, senior market manager of regulated products, said:
“Stoppers must move smoothly against the wall of the syringe barrel, provide an exceptional seal to preserve the integrity of the drug, and be chemically inert to prevent interaction with the syringe contents. Teknor Apex has developed a portfolio of Medalist TPEs that meet these performance requirements while providing substantial economic advantages because of their ease of processing.”

Certified Compounds


Teknor Apex produces Medalist compounds in ISO-13485 facilities in the USA and Singapore. All Medalist materials are made with FDA listed ingredients, are certified to ISO 10993-5 standards for biocompatibility, and are REACH SVHC compliant. They are free of DEHP and other phthalates, BPA, and latex. Standard grades are ADM-free.


Source: Teknor Apex Company
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