January 28, 2007 | Recommend this Article »

No fear of resin

The resinating process can influence the properties of the stone

The resinating process involves depositing certain suitable reactive resin systems in the surface of the stone. These very thin resin coatings strengthen weak points in the stone, such as crumbly, sandy areas, partial or continuous cracks and hairline cracks. Even very small and medium-size holes can be filled. Resin systems can also be used to strengthen the back of rough slabs using fibreglass mats or woven meshes.

Properties of systems

The resin systems are designed with the lowest possible viscosity so they can penetrate into fine cracks faster. The systems are distinguished by their special capability for penetrating into sandy and earthy spots on the stone surface. The reaction time of the system also plays an important role. The material must be cured as slowly as possible to achieve a homogeneous result. Good adhesion to the surface of the stone is also a decisive factor, which means the stone must be free of moisture before resinating. The resin systems have been developed so that the shape of the material does not contract excessively on curing. The light colour of the systems and their resistance to sunlight ensure that the natural colour of the stone remains largely unchanged.

Resinating process

Surfaces to be properly resinated must be dry and free of dust and grease. Wax or silicone treatments can impair adhesion and permeability. The temperature of the stone also affects the result of resinating, not just the surface structure. Heating the slabs is advantageous: marble between 40 and 50 °C, granite between 50 and 60 °C. This reduces the moisture in the cracks and the stone dries better. The heat causes the stone to expand, which also opens up the cracks and fissures. The warm stone also prevents the resin curing as soon as it comes into contact with the stone, which allows the resin system to penetrate better into the stone. The temperature difference between the relatively cold resin and the warm stone also causes a kind of suction effect, which speeds up the penetration of the resin.