Name: Vinyl Silane Adhesion Promoter VS-2
Brand: Coatingsink
SKU: vinyl-silane-adhesion-sealant-vs2
Availability: InStock

Question 1

What is the recommended loading level of VS-2 in moisture-curable sealant formulations?

Accepted Answer

Typical dosage is 0.5–2.0 phr. Higher loadings (up to 3 phr) are used when adhesion to difficult substrates such as untreated glass or aluminium is required. Excess silane can migrate to the surface and act as a moisture scavenger, extending open time.

Question 2

How does vinyltrimethoxysilane function as a crosslinker versus a primer?

Accepted Answer

VS-2 serves a dual role: the vinyl group copolymerises into the polymer backbone (e.g. with peroxide or addition-cure systems), while the three methoxy groups hydrolyse under atmospheric moisture to form silanol groups that condense with hydroxyl-bearing substrates, creating covalent siloxane bonds at the interface.

Question 3

Is VS-2 compatible with tin-catalysed RTV-1 systems?

Accepted Answer

Yes. VS-2 is compatible with both tin-catalysed (DBTDL) and titanate-catalysed one-component RTV systems. Because the methoxy groups hydrolyse more slowly than acetoxy silanes, VS-2 produces lower acidity on cure and is preferred in electronics and automotive glazing applications where corrosion risk is a concern.

Purity	≥98%
Moisture	≤0.10%
Boiling Point	123°C
Density (25°C)	0.97 g/ml
Refractive Index (nD20)	1.393

Vinyl Silane Adhesion Promoter VS-2

Specifications

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