Name: Silane-Terminated Polyester Adhesive STE-20
Brand: Coatingsink
SKU: silane-terminated-polyester-adhesive
Availability: InStock

Question 1

How does STE-20 cure and is there a pot life concern for single-component use?

Accepted Answer

STE-20 is a one-component moisture-cure system that crosslinks via atmospheric humidity at room temperature — no mixing is required. Skin formation occurs in approximately 30 minutes at 23°C/50% RH, with cure depth progressing at roughly 3 mm per day. There is no pot life limitation; the unopened container remains stable for 12 months when properly sealed.

Question 2

Can STE-20 be overpainted, and how soon after application?

Accepted Answer

Yes, STE-20 is designed to be fully paintable once a surface skin has formed, typically 2–4 hours after application. It accepts most waterborne and solvent-borne topcoats without a primer coat. Painting before the skin forms risks disrupting the moisture-cure reaction and can result in a permanently tacky surface beneath the paint film.

Question 3

Which substrates does STE-20 bond to without a primer, and where is priming recommended?

Accepted Answer

STE-20 bonds directly to clean, dry concrete, brick, aluminium, primed steel, rigid PVC, wood, and glass. On dense or low-porosity surfaces such as polished aluminium or glazed ceramics, a silane adhesion promoter improves long-term wet adhesion. STE-20 is not suitable for non-polar polyolefin substrates (PE, PP) without prior surface activation by flame or plasma treatment.

NCO Content	0% (isocyanate-free)
Viscosity (23°C)	20,000–30,000 mPa·s
Elongation at Break	>400%
Shore A Hardness (cured)	25
Skin Formation Time (23°C/50% RH)	~30 min

Silane-Terminated Polyester Adhesive STE-20

Specifications

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