Name: Vinyl-Terminated PDMS for Addition-Cure Sealants VP-200
Brand: Coatingsink
SKU: vinyl-terminated-pdms-vp
Availability: InStock

Question 1

What is the typical vinyl content of VP-200 and how does it affect crosslink density?

Accepted Answer

VP-200 carries approximately 0.10 mmol/g vinyl groups. A higher Si-H:vinyl molar ratio (1.2–2.0:1) increases crosslink density and Shore A hardness; lower ratios yield a softer, more extensible network. Adjust the crosslinker loading rather than the base polymer to tune modulus.

Question 2

Can VP-200 be used in a one-part addition-cure formulation?

Accepted Answer

No — addition-cure systems are inherently two-part. Part A contains the vinyl PDMS and Pt catalyst; Part B contains the hydride crosslinker. Pre-mixing the two parts triggers premature gelation. Store components separately and mix only immediately before application or dispensing.

Question 3

How should VP-200 be handled to prevent Pt catalyst inhibition?

Accepted Answer

Avoid contact with nitrogen- or sulfur-containing compounds, tin, lead, and phosphorus-based additives — all are potent Pt inhibitors. Use clean stainless steel or polyethylene equipment; even trace amounts from rubber gloves or lubricants can cause surface tack or incomplete cure in the finished sealant.

Flash Point	>200 °C
Vinyl Content	~0.10 mmol/g
Density (25°C)	0.97 g/mL
Viscosity (25°C)	20,000 mPa·s

Vinyl-Terminated PDMS for Addition-Cure Sealants VP-200

Specifications

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