THERMOPLASTIC ELASTOMERS | MATERIALS


Table of properties for Medalist grades from Teknor Apex Typical Properties


ASTM Density, g/cm3


Hardness (5s delay), Shore A 100% Modulus, MPa Tensile Strength, MPa Elongation, %


Test Method D792


D2240 D412 D412 D412


Melt Flow Rate (200°C/5.0 kg), g/10 min D1238 Sterilisation Method


--- Over-Moulding Substrate Adhesion --- Medalist


Medalist


1.04 55


Medalist


MD-24150 MD-16155HH MD-12150S 0.93 48


0.89 50


1.31 2.21 230 5


Steam PP a: 230 °C/2.16 kg. b: PC, ABS, PC/ABS, COPE, PMMA, PBT, POM


over-moulding onto various engineering thermo- plastics. Teknor Apex adds that, unlike most TPVs, Medalist TPEs do not require pre-drying. Further- more, they exhibit improved compression set in comparison with competing TPEs, making possible a more secure seal. All grades are sterilisable. They come in natural and black. “The Medalist compounds provide substantial advantages over rubber, which has been the predominant material for use in syringe stoppers,” says the company. “TPEs avoid the curing step required in rubber processing, eliminating con- cerns about extractables and leachables, and their scrap can be recycled. As thermoplastics, TPEs process in considerably shorter moulding cycles and lend themselves to more intricate designs and tighter dimensional tolerances.” “Stoppers must move smoothly against the wall


of the syringe barrel, provide an exceptional seal to preserve the integrity of the drug, and be chemi- cally inert to prevent interaction with the syringe contents,” says Ross van Royen, senior market manager of regulated products. “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.” 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 compli- ant. They are free of DEHP and other phthalates, BPA, and latex. Standard grades are ADM-free. Also introducing new medical grades to its


portfolio at NPE was Elastocon TPE Technologies. Elastocon 8028N (Shore A hardness 28) and Elastocon 8068N (68A), which recently passed USP Class VI testing for respirators and other medical


www.injectionworld.com May 2018 | INJECTION WORLD 47


product applications, can be injection moulded and extruded. They are characterised by high flow, zero odour, and resistance to chlorine and most sanitizers, as well as many cleaning products.


Filling a gap in high performance Speciality polyamides producer Nylon Corpora- tion of America (Nycoa) is a new player in the TPE arena. It has launched an extended product family of polyether-block-amides (PEBA), branded Ny-Flex. The type and the ratio of the polyether and polyamide blocks can be varied. Nycoa is aiming at applications in automotive, sporting goods, personal electronics, and composites, as well as in specialty films. Nycoa says Ny-Flex grades exhibit a broad


range of performance attributes in terms of impact toughness and flexibility. It currently offers grades with hardnesses ranging from 82 Shore D to 90 Shore A. “These innovative materials have been designed to fill a technology gap in the engineering TPE [E-TPE] material space,” said Pratik Shah, vice president of new business development for Nycoa. “During the extensive development cycle, our


Below: Syringes with stoppers (in black) injection moulded in Medalist TPE from Teknor Apex


2.41 6.14 610 1.2a


Steam PP


1.45 4.31 620 6


Ethylene


Medalist


MD-34950 0.94 50


1.52 6.21 640 3


Ethylene


Oxide; Gamma Oxide; Gamma PP


ETPsb


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