DAMTEC® under ballast mats are products for decoupling and protection under rail systems, tested according to DIN 45673-5 (Mechanical vibrations – resilient elements used in railway tracks – laboratory test procedures for under ballast mats (UBM)). They reduce structure-borne noise and secondary airborne sound as well as vibration emissions. In the case of ballasted track, the service life is extended by a lower and more uniform load. At the same time, they also protect engineering structures and waterproofing. DAMTEC® SBM K sub ballast mat are supplied in rolls. SBM stands for the term “Sub Ballast Mat”, K for the material “rubber” (German: Kautschuk).

Our under ballast mats comply with the technical delivery conditions of Deutsche Bahn (DBTL 918071. The user releasing as a controlled design of the under ballast mat DAMTEC® SBM K 10V for ballasted track was approved by DB Netz AG from superstructure technical point of view under the TM‐titel 4‐2015‐10511 I.NPF 1 to Ril 804,820,824.

In addition to exact measurements of the static bedding modulus (Cstat1, Cstat2), the dynamic bedding modulus (Cdyn1, Cdyn2) and the mechanical fatigue strength, DAMTEC® Under Ballast Mats of the SBM K series are also tested for numerous other technical values such as water and freeze/taw resistance.

Typical examples of use:

• Structure-borne noise isolation on track systems in urban centres, especially in the immediate vicinity of buildings
• Reducing the noise and vibration emission to buildings with particularly high requirements for noise prevention (for example, opera houses, concert halls, test institutions, hospitals)
• Protecting against low-frequency vibrations caused by space-limiting surfaces (secondary airborne sound)
• Stabilising track constructions; particularly in high-traffic routes

Extract from the product portfolio for DAMTEC® SBM K Under Ballast Mats

Flat products:

• DAMTEC® SBM K 10 • K 10 V
• DAMTEC® SBM K 20 • K 20 V
• DAMTEC® SBM K 23 • K 23 V

Flat products:

• DAMTEC® SBM K 17/8 • K 17/8 V
• DAMTEC® SBM K 25/7 • K 25/7 V

V = version with laminated geotextile