Name: Silane-Terminated Polyurethane STPU-30
Brand: Coatingsink
SKU: silane-terminated-polyurethane-stpu
Availability: InStock

Question 1

What is the cure mechanism and typical open time of STPU-30?

Accepted Answer

STPU-30 cures via atmospheric moisture hydrolysis of alkoxysilane end-groups, forming a siloxane crosslink network. Open time is typically 15–30 minutes at 23°C/50% RH; through-cure of a 3 mm bead takes 24–48 hours depending on ambient humidity.

Question 2

Is STPU-30 compatible with standard pigment pastes and colorant dispersions?

Accepted Answer

Yes. Being isocyanate-free, STPU-30 accepts most standard polyurethane pigment pastes and colorant concentrates without NCO-reactivity concerns. Loadings up to 10% are typical without significant impact on cure rate or final mechanical properties.

Question 3

What Shore hardness, modulus, and joint movement accommodation can be expected from the cured sealant?

Accepted Answer

Films cured 7 days at 23°C/50% RH exhibit Shore A hardness of 20–35 and elongation ≥400%. Low tensile modulus (<0.5 MPa at 100% elongation) supports dynamic joint movement of ±25% and minimises peel stress on bonded substrates.

NCO Content	<0.1%
Density (23°C)	1.18 g/ml
Viscosity (23°C)	40,000–60,000 mPa·s
Silane End-Group Content	~2.5 wt%
Elongation at Break (cured, 7d)	≥400%

Silane-Terminated Polyurethane STPU-30

Specifications

FAQ

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