Dupré Minerals

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Acoustic Insulation

Completely fireproof, non-irritant and fibre-free, ultra-lightweight Micafil has many applications. Free flowing and easy to install, it is ideal for thermal and acoustic insulation in lofts, between floors, interior cavity walls and for pipe protection.

Traditionally it was thought that the incorporation of heavy materials into a building fabric was necessary in order to achieve a high level of sound absorption, by resisting the sound energy attempting to pass through it. In many cases, however, it is undesirable to use heavy building materials in modern construction and space constraint dictates that it is impractical to install them in existing buildings. Builders and architects are thus considering alternative lightweight acoustical dampening materials, and here the special properties of vermiculite prove to be of interest.

Sound Absorption Coefficients

Testing of Vermiculite was undertaken by AIRO (Report No. L/2840) "Acoustic Investigation & Research Organization Ltd" who compared Vermiculite to National Standards and reported the results as follows using sound absorption coefficients:

Depth (mm)ClassificationReport No.
50 - "Micafil"aw = 0.55 (mH) Class 'D'L/2840/1
100 - "Micafil"aw = 0.90 (mH) Class 'A'L/2840/2
150 - "Micafil"aw = 1.00 (mH) Class 'A'L/2840/3
100 - "Rockwool"aw = 1.00 (mH) Class 'A'L/2840/4

 Loft Insulation


Downloads

The above product information is given in good faith as accurate and reliable but is not to be taken as a guarantee. The figures provided are intended to be a guide to expected average values and should not be interpreted as a specification. Any potential applications referred to are not to be construed as recommendations. It is the responsibility of the user to determine suitability for any specific purpose.