SvgConversionOptions.MinStrokeWidth Property
Gets or sets the minimum stroke width that will be used in the resulting SVG. If the PDF use a thinner stroke width, it will be replaced with this width.
Remarks
The default value is 0.5.
The value is expressed in transformed user space units of the converted PDF page. By default 1 user space unit is 1/72 inch (0.35 mm), but this can be overridden by the PDF document. Transforms can affect the actual minimum width in the generated SVG.