Selleys Brick and Concrete Silicone is a neutral (non-corrosive) cure 100% silicone sealant. It is low modulus or can be stretched easily which makes it ideal for joints which will move significantly such as expansion joints in concrete and is grey so it will blend in with the concrete surrounds. Features Superior flexibility +/- 25% movement capability & up to 500% elongation or stretch. Superior silicone formulation forms a durable seal which locks out water and which does not shrink when drying. UV and weather resistant Immune to the damaging effects of the sun. Temperature resistance approximately -60°C +150°C. Superior adhesion to concrete and fibre cement surfaces. Low odour so can be used in any environment without discomfort. 25 year guarantee when used as directe.