Name: SEBS Thermoplastic Elastomer for Hot-Melt Adhesives
Brand: Coatingsink
SKU: sebs-thermoplastic-elastomer-hotmelt
Availability: InStock

Question 1

What oil-to-polymer ratio is recommended when formulating SEBS hot-melt adhesives?

Accepted Answer

Typical formulations use 100–200 phr of white mineral or naphthenic oil relative to SEBS polymer. Higher oil loading (200 phr) reduces melt viscosity and improves substrate wetting; lower loading (100 phr) retains more cohesive strength. Always balance with a compatible tackifier (C5/C9 resin or DCPD) at 50–150 phr to achieve target peel and loop tack.

Question 2

How does SEBS compare to SIS or SBS in outdoor or UV-exposed adhesive applications?

Accepted Answer

SEBS is the preferred choice for UV-exposed assemblies because the mid-block is fully saturated (polyethylene-butylene), eliminating residual double bonds that degrade under UV and ozone. SIS and SBS contain unsaturated mid-blocks and yellow significantly within weeks of outdoor exposure, whereas SEBS formulations retain clarity and adhesion for several years.

Question 3

What processing temperature range should be used for SEBS hot-melt compounding?

Accepted Answer

SEBS hot-melt blends are typically processed between 160–200°C. Exceeding 220°C risks thermal oxidation of the oil phase; use antioxidant packages (e.g., Irganox 1010 + Irgafos 168 at 0.2–0.5 phr each) when long residence times in the melt are expected. Melt viscosity is highly shear-rate dependent, so twin-screw or gear-pump metering is preferred over single-screw extrusion.

Diblock Content	<5%
Styrene Content	29–33%
Shore A Hardness	71
Elongation at Break	>500%
Solution Viscosity (25°C, 10% in cyclohexane)	3,000–6,000 mPa·s

SEBS Thermoplastic Elastomer for Hot-Melt Adhesives

Specifications

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