TPE Supplier China | SEBS Compounds & TPV Grades

When TPE beats both POE and TPU

Three materials get quoted for "something soft". What decides it is what enters your part and what kills it in service:

POE for toughness inside another resin — impact modification of a PP or PE part, rarely the part itself.
TPE for a finished part that grips, seals or flexes, where the failure mode is comfort or fit rather than wear.
TPU once abrasion, load-bearing rebound, oil contact or cold-flex enter the specification — documented on the TPU page, not repeated here.

Question	POE	TPE	TPU
What you buy	Modifier resin for a compounder	Ready-to-mould elastomer compound	Ready-to-mould engineering elastomer
Duty chosen for	Impact strength, foam, film	Soft touch, grip, sealing lips, closures	Wear, load-bearing recovery, oil, cold
Where it loses	Cannot be the soft part alone	Gives up wear life	Costs more; strict drying rules

Inside TPE: SEBS compounds and TPV

"TPE" is a family, not a grade. Name it in every RFQ, or two quotations at the same hardness may describe different materials.

SEBS-based compounds — a hydrogenated styrenic block copolymer extended with oil and filler — are the soft-touch default: easy processing, good colourability, bonding to common substrates after trials, covering most grips, handles, pads and closures. Their limits surface as heat, compression recovery and oil resistance.

Dynamically vulcanised TPV carries a crosslinked rubber phase in a thermoplastic matrix, chosen for better recovery after compression, tolerance of higher continuous service temperature, and improved oil and weathering resistance. Have the limit and compression set quoted, not assumed. Seal-specific selection is written out in TPE vs TPV sealing material.

Specifying hardness without paying for it

Hardness is the most over-specified line in a TPE enquiry and the least informative alone:

Quote a range, not a point — a band lets the compounder hit your feel with a standard grade.
Name the scale and dwell — figures read differently are not comparable; see the Shore hardness guide.
Specify the duty first — grip, seal force and flex life are performance; hardness is one input to them.

Processing, bonding and regrind

Drying: styrenic TPE lacks ester-TPU's hydrolysis failure mode, but whether your grade needs drying is the grade owner's answer.
Overmoulding: bonding is substrate-specific, depending on melt temperature, shot timing and substrate grade. Read why soft grips peel before fixing a price, then require trials on your own substrate.
Tooling: shrinkage and venting differ from rigid resins; custom molding covers tool trial and correction before volume. Agree a written regrind ceiling per part.

What to write in the RFQ and ask to see

Family and grade code — SEBS-based compound or TPV, not "TPE"
Hardness band with scale and method, plus service temperature
The duty — grip, seal force, flex cycles — plus contact media (skin, water, oil, cleaning agents, outdoors) and any compression set with its test conditions
Documents — lot COA with measured values, TDS, SDS, REACH SVHC and RoHS statements, plus the contact declaration for food (food grade plastics), water, skin or medical use

Where TPE sourcing goes wrong

Buying on hardness alone, which says nothing about recovery, oils or heat limit.
Asking TPE to toughen a polyolefin part — that is a modifier's job: start from POE.
Comparing a TPV price against a styrenic compound: different families, different duty.
Accepting "TPE" on an order with no grade code — the naming trap is unpacked in TPE vs TPR.

Frequently Asked Questions

When is TPE simply the wrong answer?

When either end of the ladder owns the job: impact modification belongs to POE, wear and cold-flex duty to TPU.

Should I ask for SEBS or TPV?

Start from the duty. Soft touch and grip usually land on an SEBS compound; recovery, heat or oil contact push towards TPV. Compare both on the same test evidence.