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Hi. Yes, the Steicoflex is arguably better than most mineral wools as it is denser and wood fibres are slightly better at absorbing sound energy as well. This product is 60kg/m3 so you'd need a mineral wool of at least that density to improve on the Steicoflex.
For the best sound insulation try using our EBB Clay Boards which have a 52dB reduction for a single sheet on a solid stud wall or 63dB reduction if both sides of the studs are using clay boards.
Hope that helps.
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