soni 491 STL

Sound insulations sheets for walls towards neigbours | curtain walls

  • Excellent sound transmission insulation
  • Highly effective 2-component product


Content: 0.5 m² (€39.80* / 1 m²)
Prod. no. H80400014

Available in 15 days, delivery time 2-5 days


Our soni 491/STL noise-control panel is a highly effective sound-insulation product based on PUR foam, equipped with a micro-perforated surface film and additionally with a heavy layer. This clever combination of two different acoustic materials ensures both sound-insulating and sound-absorbing properties in one product. soni 491 STL is suitable, for example, for boosting the sound insulation effectivity of a wall, partition wall or ceiling.

Advice on building a curtain wall:
For a curtain wall, dowel wooden laths of 30 or 50 mm thickness to the wall. Ideally, an elastic layer is placed between the wall and the laths to prevent sound bridges. Our soni NBR sealing tape is the ideal solution for such an elastic mounting. Then insert our sound-absorber product soni 491 STL in the empty spaces between the laths and cover them with plaster boards or particle boards screwed to the laths. For even more effective sound absorption, soni 491 STL can be mounted on the wooden laths (30 mm) instead of being applied directly on the wall. The resulting air gap acts as an extra sound insulation. To optimize the curtain wall you can "decouple" the plaster board / particle board from the floor and ceiling as well as the adjacent walls by filling the edge joints with acrylic.

For an example of a curtain wall construction for noise insulation purposes, please see the testimonial "Neighbors / Curtain Walling”. 

If you do not have the tools and/or the time to cover the sound-insulation panels with plasterboard or chipboard, we recommend our soni COMPOSITE as an alternative sound-insulation material. In contrast to soni 491 STL, soni COMPOSITE scores with a stylish decorative felt surface that is available in different colors and excellent for visible sound-conditioning materials.
Technical data
Acoustic benefits: sound insulating
sound insulation and sound absorption
sound absorption
Applications: Wall towards neighbors | Curtain wall
Production hall | Workshop
Sound studio | Rehearsal room
Basic material: heavy foil
PUR foam
Color: black
Flammability: FMVSS 302, automotive fire safety standard
Note: - Sealed but air-permeable surface
- Dirt-repellent
- Easy handling
Rear face: self-adhesive (sk)
Size: 1000 x 500 mm
Temperature resistance: -40°C to +100°C
Thickness: 32 mm
Types of uses: Wall absorbers
Ceiling absorbers
Products for technical applications
Weight: 1.800 g
Product information request


Cartridge / Set of 6 or 12 cartridges: set of 6 cartridges of 310 ml each
Our soni SPECIAL ADHESIVE is an ideal adhesive for spot and full-surface fixation of sound-insulation materials and acoustic elements made of open-cell foam, especially melamine and PUR foams. The solvent-free, stable soni SPECIAL ADHESIVE provides excellent adherence to typical building materials, such as concrete, plaster, masonry, cement and wood. With the elastoplastic, single-component polymer adhesive, our open-cell foam panels can be glued directly to the wall or ceiling. Our soni SPECIAL ADHESIVE is available in 310-ml-cartridges, in sets of 6 or 12 cartridges. Please note: soni SPECIAL ADHESIVE is not suitable for PE foams such as soni RESIST. Keep out of reach of children!

Content: 6 piece(s) (€5.15* / 1 piece(s))

Variants from €5.90*
Set 1 / Set 2: Set 1 (for 25 to 30 mm material)
For the mechanical fixation of soundproofing material. Set 1 (for 25 to 32 mm thick material) consists of 20 nylon anchors 8x40, 20 screws 6x70/42 and 20 fixation disks. Set 2 (for 50 to 52 mm thick material) consists of 20 nylon anchors 8x40, 20 screws 6x90/56 and 20 fixation disks.

soni NBR sealing tape
Order your sealing tape from soniflex Our sealing tape is one of various products that can be used for sealing off specific areas or decoupling different elements from each other: an ideal and easy to use solution! soni NBR sealing tape is a closed-cell sealing material produced on the basis of NBR. Sealing tape from soniflex offers you a high level of safety, reliability and quality that you can rely on! Properties of soni NBR sealing tapeThe self-adhesive sealing tape is made of a closed-cell material and scores with a range of specific properties that make it particularly versatile to use. This sealing tape can withstand temperatures from -40 to +80 degrees and also offers a high level of safety and reliability. Thanks to its self-adhesive equipment, the application of soni NBR sealing tape is quick and easy. The high adhesive strength ensures a secure and reliable application. The sealing tape comes in 40 mm wide rolls and can be cut to the desired length with the appropriate tool. Each roll contains five meters of tape. The use of soni NBR sealing tapeA typical application of soni NBR is in the construction of a curtain wall, where the tape is used to acoustically decouple the wooden lathing. As our product is suitable for contact with oils, e.g. engine oil, our sealing and decoupling tape has also proven its effectiveness and practical use in many technical areas, for instance in vehicles, machines, housings, hoods and other areas for many years now. What is more, our soni NBR is extremely resistant to deformation and wear, which makes it much more durable than other products in this field. The self-adhesive rear face makes installation fast and easy. Do you have any questions about our soni NBR sealing tape or other products from our soniflex shop? If so, please get in touch and we will be happy to help you.

Content: 5 m (€1.58* / 1 m)


Related products

Color: light grey | Thickness: 32 mm
Order your soundproofing panel from soniflex soni COMPOSITE is a combination product made from our synthetic soni EVA heavy layer and an acoustic foam laminated with a decorative felt layer. This ideal combination ensures a twofold noise-control effect: sound absorption plus sound insulation – for especially high overall effectiveness in reducing the noise level. Applications for soni COMPOSITE soni COMPOSITE is particularly suitable for sound-transmission insulation. Mounted on the wall towards the neighbor’s apartment or behind a so-called curtail wall, for instance, our two-layer acoustic product achieves a noticeable noise reduction. For individual design options, you have the choice of various felt colors. Using a carpet knife, you can cut soni COMPOSITE to the required size and shape. The self-adhesive equipment of the rear face serves primarily as an installation aid.

Content: 0.5 m² (€71.80* / 1 m²)

Variants from €32.90*