Tools & Calculators

Silane Required for Surface Coverage - Hydrolytic Deposition Creating a Minimum Uniform Coverage

The majority of surface modifications are affected by the hydrolytic deposition of trialkoxysilanes. Specific Wetting Surface (SWS) is a value determined empirically for the amount of silane required to obtain a minimum uniform multilayer coverage of a substrate. This calculator uses SWS numbers for different silanes to tell you the suggested amount of silane to use on a substrate.

Amount of Silane Required (g)

0

Surface Area of Common Substrates

Type

E-Glass

Silica, ground

Silica, diatomaceous

Calcium silicate

Clay, kaolin

Talc

Silica, fumed

m^2/g

0.10-0.12

1.0-2.0

1.0-3.5

2.6

7

7

150-250


Suggested Starting Ratios of Hydride Functional Siloxanes (Parts) to 100 Parts Vinylsiloxane

Calculation below is based on 1:1.5 molar ratio of vinyl to hydride

Parts Hydrosiloxane

0

Parts Vinylsiloxane

100

Formulation is based on 1.5 Si-H to 1 Vinyl-Si; filled formulations may require up to 3x of Si-H amount listed. Optimal cure ratio is determined by measuring the hardness of cured elastomers at different ratios

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