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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