Marine
Mastic
Ltd.

Materials

E. Dense Stone Asphalt Mattresses

Dense Stone Asphalt (DSA) - also used for mattresses in the same way as Open Stone Asphalt (OSA).

OSA is porous whereas DSA has a higher mastic content which fills all the voids in the mixture resulting in a dense, stronger material.

OSA use more for scour/erosion protection. . .
DSA used more for impact protection.

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