RockDelta - Vibration Isolation Systems

As a member of the Rockwool Group of companies – the world’s largest and leading manufacturer of stone wool – the vision of RockDelta is to preserve a comfortable environment by controlling unwanted ground-borne noise and vibrations through our high-quality vibration isolation systems.

Based upon two distinct product lines – RockBallast® for anti-vibration treatment of ballasted tracks and RockXolid® for anti-vibration treatment of floating slab tracks – our innovative product portfolio consists of mat-based vibration isolation systems to help control ground-borne vibrations.

RockDelta vibration isolation systems have been installed since 1974.

Anti-vibration mats

Our high-efficiency, durable, stone wool based anti-vibration mats provide attenuation of vibration by resiliently decoupling the track from the ground. RockDelta vibration isolation mats are high-efficiency, full-contact and resilient.

Floating slab track anti-vibration mats

RockXolid resilient mats for floating slab tracks form a resilient support system that effectively decouples the concrete slab from the ground. Vibrational forces are attenuated as they pass through the resilient support system

Ballast track vibration isolation

The RockDelta solution for vibration isolation of ballast track is based on a three-stage approach using RockBallast® resilient mats as the core element. The system consists of a unique, patented dual-density sub ballast mat with:

• A soft resilient layer, designed to have an extended lifetime
• A force-distributing, high-density top layer

The final component is a first-rate, composite product comprising two membranes of non-woven geotextile and a load-distributing core. This purpose-built geotextile exhibits high puncture resistance, high tensile strength, superb filtering characteristics and excellent water flow capacity while perfectly deforming under the load of the ballast and also enabling easy ballast replacement.

Advantages of RockBallast and RockXolid anti-vibration mats include:

• Excellent dynamic properties with superb volume compressibility
• Sustain very high pressure
• Exceptional fatigue resistance
• Outstanding functional performance under any climatic conditions
• Fully documented specifications based upon exhaustive tests
• Exceptional lifespan with virtually no change in functional performance
• Maintenance-free solution
• Fast, easy and safe installation even when the track curves
• No functional performance changes at sub-zero temperatures
• All products aged to ensure outstanding long-term stability

RockDelta stone wool

RockDelta stone wool is an inorganic and inert material with retained functional performance throughout entire operational life span. It sustains very high levels of pressure.

It has a high degree of resistance to environmental factors:

• Water: e.g. submersion from flooding provides only slight change in dynamic compliance
• Sub-freezing temperatures do not change functional performance
• Unaffected by soiling of the ballast bed from ballast degradation or sand deposits
• Unaffected by exposure to sunlight and ultra-violet rays
• Memory-free: e.g. if subjected to flooding and subsequent drying

A high degree of resistance to chemical factors include outstanding durability of fibers in weak acids and alkaline solutions, resistance to all naturally occurring soil alkalis and acids. Similarly, with regard to biological factors, RockDelta stone wool provides no nourishment for animals and is unaffected by fungi and bacteria.

RockDelta stone wool is fully recyclable.