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USING HALYARD INSULATION

12mm (1/2") Materials

All are supplied with 4 sheets 1000 x 600mm (39" x 24") per box.

S3002 Maritex faced material.
S3004 Sealglass faced material.
S3003 Re-inforced silver polyester faced material

These material offers around 12dB reduction at 1000Hz and above, but its efficiency reduces with the heavier noises of lower frequencies. The overall reduction will give excellent results with smaller, lighter engines.

32mm (1.25") Materials.

All are supplied with 4 sheets 1000mm x 600mm (39" x 24") per box

S3017 Maritex faced material
S3015 Sealglass faced material
S3016 Re-inforced silver polyester face material

The 32mm materials offer a startling 15dB reduction at 1000Hz. Noise doubles every three decibels, so this is nearly three times as good as the 12mm. It also holds a good performance at lower frequencies, making it excellent with larger engines.

45mm (1.75") Materials

All are supplied with 2 sheets 1000mm x 600mm (39" x 24") per box

S3039 Maritex faced material.
S3037 Sealglass faced material
S3038 Re-inforced silver polyester faced material.

Older engines or steel hulls?

Beware of air-cooled engines.
Noise insulation can only be used with care, as it must not impede the flow of cooling air. Beware of solid mounted engines. Most of the noise will be structure borne with a solid mounted engine. The same applies with a steel hull. The Aquadrive anti-vibration system can reduce noise by 75% with such installations.

Notes

Halyard is the only company to have tested materials in situations designed to replicate marine engine spaces, and to offer guaranteed results on this basis. The copyright of these test results remains our property and may not be reproduced without our written permission. Results are given in dB at each frequency. Averaged decibels dB(a) have not been used, as these disguise performance at difficult frequencies.

Classification Societies and Approvals

Rules set by Lloyds, DNV and the MCA vary from time to time and from one use to another. Users should contact their surveyor or us for precise guidance, particularly where MCA rules are involved.

How did we test it?

  • We built a 20mm (3/4") ply engine casing and tested how much noise came through the bulkhead at all frequencies.
  • Then we applied each material in turn to the engine casing, and tested it again.
  • The difference between the two curves shows how much noise was reduced when the material was fitted.
  • The tests were carried out on each thickness.
  • Results vary slightly depending on which facing is used.

    I’m confused!
    Help me to choose!

    Certainly.
    Here are three straightforward recommendations:

    Budget. S3004 12mm material with Sealglass face. This material meets current EU requirements for pleasure craft. It works well. It doesn’t weigh very much, and it is at the lower end of the cost scale.

    Quality. S3017 32mm Maritex material. Really startling noise results with a tough, fireproof facing at a mid-range price.

    Excellence. S3039
    45mm Maritex material. The best results possible from any off-the-shelf material.