SandRubber

SandRubber is a granular composite material designed to combine the hardness and wear resistance of silica sand with the elasticity and damping of rubber. It is created by binding fine sand particles with a rubbery polymer, producing a porous yet resilient solid.

Formulations vary in binder chemistry and sand-to-binder ratio. Common binders include polyurethane, EPDM rubber, and silicone elastomers. Some variants incorporate shredded recycled rubber as part of the aggregate to improve elasticity and reduce material cost.

Manufacturing typically involves mixing sand with the chosen binder to form a processed mix, followed by molding and curing under controlled temperature and pressure. Techniques such as compression molding, hot pressing, extrusion, or casting are used depending on the desired geometry.

Properties are typically described as high energy absorption and mechanical damping, with stiffness adjustable through composition and density. Porosity can provide thermal insulation and drainage, while chemical resistance depends on the binder. Overall strength is moderate and tailored to application.

Applications include vibration isolation for machinery and buildings, protective padding in sports surfaces and footwear, packaging buffers, and lightweight cushioning panels. SandRubber is studied as a potential alternative to certain foams or dense rubber in specific damping or load-bearing roles.

Environmental and safety considerations emphasize the use of recycled rubber content and the indoor emission profile of binders. End-of-life options include recycling, energy recovery, or material reuse, with handling precautions during processing for dust and chemical exposure.