Sil Fil (Board) SIL FIL board is alkali resistant, closed cell polymer based expansion joint filler material for RCC columns, beams, walls and slabs. It is non staining and non deteriorating expansion joint filler for buildings. Features & Advantages Closed Cell Clean to work with no crumbs, dust or fibers Can withstand joint movement Does not react with Acids & Alkalis Does not disintegrate Negligible water absorption Non impregnated, non staining and non bleeding Will not discolor sealants or architectural substrates Excellent recovery hence can accommodate joint movement Applications Structural expansion joint in buildings Buildings brick and block work Isolation joints between adjacent constructions. E.g, buildings around manholes, drains and other concrete insets etc., Installations MRTS Chennai Mahatma Gandhi Medical College - Pondicherry And many other projects.