Acoustics insulation

U SeaProtect Acoustic Insulation

The ISOVER range ensures improved acoustic comfort due to its excellent sound absorption and sound insulation properties.

Sound absorption in Marine Shipbuilding
Acoustic insulation standards on board, especially in passenger ships, are continuously rising. With ISOVER ULTIMATE products whose acoustic insulation properties are improved by up to 50%, it is easy to make that decisive leap forward and provide state-of-the art acoustic solutions.

With ISOVER ULTIMATE you can achieve identical sound absorption properties at only around half the weight of traditional stone wool - saving you time and weight. And your passengers and crew? With ISOVER ULTIMATE they get improved acoustic comfort due to its high-level sound absorption properties and very good sound reduction. ULTIMATE acoustic insulation materials also have higher air-flow resistivity values, from density 24 kg/m3 onwards, compared to traditional marine stone-wool products. The product products have excellent sound absorption properties thanks to the unique internal micro-structure of the insulation mats comprising long interwoven fibers.

Air flow resistivity (DIN EN 29053) kPa.s/m²
ULTIMATE  Stone wool
24 kg/m³: 15  50 kg/m³:  5
36 kg/m³: 30 70 kg/m³: 18
56 kg/m³: 50 100 kg/m³: 25
66 kg/m³: 60 120 kg/m³: 35
76 kg/m³: 80  
86 kg/m³: 90  
 90 kg/m³: 100  
Saint-Gobain CRIR laboratory: 19/02/2015

How can you achieve even better marine sound insulation results?
Quietude constructions are turnkey solutions for specific areas on board of your ship such as the engine/machinery rooms, discos, theatres, cinemas, designed to achieve high sound reduction performance levels (up to 53-54 dB). These constructions increase sound protection in the critical medium-low frequency range to provide technical solutions that significantly reduce noise levels.
ISOVER’s quietude sound-barrier insulation is obtained by combining SeaProtect dB-Flex Alu sound protection membrane with other U SeaProtect acoustic insulation materials. This membrane is made from a viscoelastic polymer topped with reinforced Alu facing. By applying this membrane, you can increase the sound protection of a standard SeaProtect construction to 53dB (vs. 48dB). 

  • Significantly enhance noise reduction, by up to 53dB
  • Optimize your thermal and fire protection at the same time with ULTIMATE™ products
  • Install adapted sound-dampening insulation quickly and easily 

How does Sea Protect dB-Flex work?

This acoustic insulation solution is based on the “mass-spring-mass” principle:

- SeaProtect dB-Flex Alu plays the role of “mass”, reflecting some of the sound and letting the rest through
- Sound is transmitted to the flexible insulation and U SeaProtect acts as damper absorbing and reducing the
  amplitude of the acoustic waves
- The steel plate reflects back some of the sound into the insulation, which reabsorbs it;
- The sound transmitted to the adjacent room is significantly attenuated

Sound reduction  - Measurements
Insulating against sound is one of the major roles played by insulation materials, especially in passenger lines: it is important to protect your passengers from distracting and potentially harmful noise.
Light weight ULTIMATE insulation products allow you to achieve it, with extraordinary results in sound reduction, as the following acoustic measurements show.

 Sound Reduction for different constructions

A-60 Bulkhead Standard Design:
U SeaProtect Slab 56-70 mm
U SeaProtect Slab 76-25 mm around stiffeners
Sound Reduction Rw (C, Ctr): 49 dB (-2;-7)


A-30 Bulkhead Thin Design:
U SeaProtect Slab 36 - 70 mm
U SeaProtect Slab 76-20 mm around stiffeners
Sound Reduction Rw (C, Ctr): 49 dB (-3;-7)


A-60 Deck Standard Design:
U SeaProtect Slab 36-70 mm
U SeaProtect Slab 36-70 mm around stiffeners
Sound Reduction Rw (C, Ctr): 48 dB (-2;-6)

 Best Comfort Class Standard Design
U SeaProtect Slab 56-70 mm + 24-50 mm
U SeaProtect Slab 76-25 mm around stiffeners
Sound Reduction Rw (C, Ctr): 51 dB (-3;-8)