Flame-Retardant Sound Deadening to Absorb Structure-Borne Noise in Trains

Flame-Retardant Sound Deadening to Absorb Structure-Borne Noise in Trains
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Flame-Retardant Sound Deadening to Absorb Structure-Borne Noise in Trains

This article first appeared in the Railway-News Magazine Issue 1 2024.

Solvent-Free Artificial Resin Dispersion Achieves High Acoustic Effectiveness

When talking about travel comfort, it’s not only speed, comfortable seating and legroom that are important; so too is a sense of spaciousness.

Passengers wishing to work or rest can choose quiet carriages on trains. But trains themselves can be noisy. To reduce structure-borne noise of the rail carriages themselves and therefore to create the quietestpossible environment inside, many rolling stock manufacturers use sound deadening.

Sound insulation and the reduction of structure-borne noise in rail vehicles is a big challenge for engineers.

Although some components can be produced from alternative materials, it’s often not possible to avoid thin-walled sheet metal constructions, where significant vibration is unavoidable.

The metal sheets used in the interior construction of carriages are covered in sound-deadening materials. The paint and coating experts at griwecolor GmbH have two products in their portfolio that have been developed for this application: griwephon AN2-800 and griwephon light AN2-900.

The product range has now been expanded to include griwephon AN2-750/EU, which is classified as a nonflammable product, class A2, according to DIN EN 13501-1. The product passed the toxicity and smoke gas density test in line with the DB Systemtechnik specifications with flying colours, meeting the requirement set R1 for HL1, HL2 and HL3 for application in rail vehicles with regard to smoke development and toxicity. Griwephon AN2-800 and AN2-900 meet the requirement sets R1, R2, R3, R6, R7 and R17 in the hazard levels HL1, HL2 and HL3. All three ready-to-use one-component solutions have been tested for fire behaviour in accordance with EU standard EN 45545- 2. Furthermore, all three have very high acoustic effectiveness in accordance with DIN EN ISO 6721-3. Like the two variants already on the market, the new sound deadening solution based on aqueous synthetic resin dispersion is also hydrophobic and solvent-free.

Download the full PDF here.


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