TPEs
Do styrenic TPEs (TPE-s) materials have a styrenic soft segment or hard segment?
Soft segment. They typically have a PP hard segment.
Explain overmolding
Molding a [typically] soft touch plastic over an existing hard plastic part
Elastron G grades are based on what styrenic?
SEBS
What is the soft segment for the V201 TPV grades?
EPDM
What makes a TPV a TPV?
Intense mixing process known as vulcanization that causes the soft segment to cross-link
TPEs and TPVs like to overmolding onto what materials?
PP, PE
Elastron D is based on what styrenic?
SBS
What are the V250 and V251 grades?
Weatherseal or higher UV content grades
Which type of TPE has the best thermal performance? TPE-s, TPV, TPU, or TPC?
TPC
What are some things to consider about the design for overmolding?
Texture, flow length, thickness
What are the "F" and "P" series of Elastron TPEs?
F = food contact
P = pharmaceutical or medical
What series are the NSF grades?
V281
Which types of TPEs have hardness limitations on the soft end?
TPU and TPCs
TPU inherently wants to overmold onto PC and ABS
True
Why do we care if the TPE series is filled or unfilled?
Filler could help lower the cost but will affect the clarity of the TPE
Does Elastron have a series of nylon bondable TPVs?
No
Which TPEs are we most concerned with drying?
TPU and TPC
Why is PA 6 easier to overmold than PA 6/6?
Lower melting temperature for the TPE to melt the surface and fuse
When would TPE be a better choice than TPV?
Cost, lower hardness, better colorability
What causes issues with using any color of TPV outside black?
Black specs as part of the vulcanization process with the phenol catalyst