Spectrem 1 is a high-performance, single-component, moisture-cure, ultra-low modulus silicone sealant designed for the most demanding dynamically moving joints. It is ideal for applications involving materials with high coefficients of linear expansion, including aluminum curtain walls, precast concrete panels, metal panels, and window perimeters. This versatile sealant delivers excellent primerless adhesion to most construction substrates, including difficult-to-adhere-to surfaces. Its ultra-low modulus formulation provides exceptional elasticity, allowing it to accommodate joint movement of +100% / -50%, making it a trusted solution for expansion joints, perimeter caulking, and complex building envelope detailing. Engineered for long-term durability, Spectrem 1 resists driving rain, ozone, UV exposure, and temperature extremes. It also carries GREENGUARD Gold Certification, making it suitable for use in sensitive environments such as hospitals and schools. Available in a wide range of standard colors, with custom color matching options available.