Sonex Convoluted Acoustic Foam

Sonex is an Australian-made premium range of acoustic foam products designed for home theatres, studios, and for commercial and industrial use. Sonex is an open cell, convoluted, combustion modified (fire retardant) foam (grade N28-180CM) designed to absorb reverberation and echo, providing softer, clearer and purer sound.

Convoluted foam profiles (similar in shape to the inside of an egg carton) provide over twice the surface area for sound wave absorption, compared to a flat foam sheet of the same size. By interfering with sound wave direction, and by trapping and absorbing sound energy, the convoluted foam profile helps to remove high frequency background noise, and increase sound clarity, resulting in softer and clearer sound. 

Sonex acoustic foam sheets and tiles are most beneficial in removing the short wavelength, higher pitched (high frequency) sounds. For rooms where long wavelength, deep sounds also need to be removed add some bass corner traps

Sonex foam sheets are made from combustion modified materials that have been tested to international and Australian flammability standards for automotive, aviation, and furniture industries. Sonex has also been rated under several Australian construction and building standards.

Sonex sheets and tiles can be mounted directly onto walls and ceilings. They can also be bonded to separate backing materials for optimised performance and customised acoustic solutions, such as hanging acoustic baffles and free standing sound barriers.

For alternative sound absorbing products see our high density NBR acoustic insulation sheet.

For indicative sound absorption coefficients and technical data refer to Sonex Brochure and technical data for a comparable product. Contact us if more information is required.


  • Sheet 1930 x 1435 x 50/30mm*
  • Tiles 475 x 475 x 50/30mm - pack of 12

* Full sheets can come up to 2100mm long and are untrimmed (have rough outer edges) on their ends. 

'50/30mm' means 50mm thick at the high points and 30mm thick at the low points.

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Customer Reviews

Based on 2 reviews

Foam, Good. No look like picture

Not the usual

I wasn’t going to say anything but you’ve sent this through so
The ends of the sheets and some of the edges where not uniform, creating additional waist. FYI there much more sides like this then good ones.
Also the thickness was not consistent from sheet to sheet.
However the spray glue was a good tip to pass on.
To conclude, normally the product is heavily protected to guard your great quality. This time round the quality was not there.
Sorry but you dropped the ball this time. I probably should have spoken out at the time but I was busy at the time and didn’t want confrontation.

Hi Chris, thanks for your feedback. Its true that the ends of the large sheets have rough edges at around 2080mm apart. This allows for trimming back to the nominal 2040mm length, or shorter to fit the space required. Guess we should mention this on our web page. Sorry for the inconvenience, and thanks again for your understanding. Simon